{"id":3170,"date":"2026-01-09T14:43:41","date_gmt":"2026-01-09T14:43:41","guid":{"rendered":"https:\/\/blog.examboosts.com\/?p=3170"},"modified":"2026-01-09T14:43:41","modified_gmt":"2026-01-09T14:43:41","slug":"2026-easy-success-oracle-1z1-830-exam-in-first-try-q20-q44","status":"publish","type":"post","link":"https:\/\/blog.examboosts.com\/ja\/2026\/01\/2026-easy-success-oracle-1z1-830-exam-in-first-try-q20-q44\/","title":{"rendered":"2026 Easy Success Oracle 1z1-830 Exam in First Try [Q20-Q44]"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;3170&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;2026 Easy Success Oracle 1z1-830 Exam in First Try [Q20-Q44]&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n<p><span style=\"color: red;font-size: 18px\"><strong>2026 Easy Success Oracle 1z1-830 Exam in First Try<\/strong><\/span><\/p>\n<p><span style=\"color: red\"><strong>Best 1z1-830 Exam Dumps for the Preparation of Latest Exam Questions<\/strong><\/span><\/p>\n<div id=\"watu_quiz\" class=\"quiz-area single-page-quiz\">\n<form action=\"\" method=\"post\" class=\"quiz-form \" id=\"quiz-1201\" >\n<div class='watu-question' id='question-1'><div class='question-content'><p><strong>Q20.<\/strong> Given:<br \/>java<br \/>StringBuffer us = new StringBuffer(&#8220;US&#8221;);<br \/>StringBuffer uk = new StringBuffer(&#8220;UK&#8221;);<br \/>Stream&lt;StringBuffer&gt; stream = Stream.of(us, uk);<br \/>String output = stream.collect(Collectors.joining(&#8220;-&#8220;, &#8220;=&#8221;, &#8220;&#8221;));<br \/>System.out.println(output);<br \/>What is the given code fragment&#8217;s output?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23770' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91977' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91977' class='answer answer-1 js-answer-label answerof-23770' value='91977' \/>&nbsp;<label for='answer-id-91977' id='answer-label-91977' class='js-answer-label answer label-1'><span class='answer'>US-UK<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91978' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91978' class='answer answer-1 js-answer-label answerof-23770' value='91978' \/>&nbsp;<label for='answer-id-91978' id='answer-label-91978' class='js-answer-label answer label-1'><span class='answer'>An exception is thrown.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91979' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91979' class='answer answer-1 js-answer-label answerof-23770' value='91979' \/>&nbsp;<label for='answer-id-91979' id='answer-label-91979' class='js-answer-label answer label-1'><span class='answer'>-US=UK<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91980' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91980' class='answer answer-1 php-answer-label answerof-23770' value='91980' \/>&nbsp;<label for='answer-id-91980' id='answer-label-91980' class='php-answer-label answer label-1'><span class='answer'>=US-UK<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91981' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91981' class='answer answer-1 js-answer-label answerof-23770' value='91981' \/>&nbsp;<label for='answer-id-91981' id='answer-label-91981' class='js-answer-label answer label-1'><span class='answer'>Compilation fails.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91982' \/><div class='watu-question-choice'><input type='radio' name='answer-23770[]' id='answer-id-91982' class='answer answer-1 js-answer-label answerof-23770' value='91982' \/>&nbsp;<label for='answer-id-91982' id='answer-label-91982' class='js-answer-label answer label-1'><span class='answer'>US=UK<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, two StringBuffer objects, us and uk, are created with the values &#8220;US&#8221; and &#8220;UK&#8221;, respectively. A stream is then created from these objects using Stream.of(us, uk).<br\/>The collect method is used with Collectors.joining(&#8220;-&#8220;, &#8220;=&#8221;, &#8220;&#8221;). The joining collector concatenates the elements of the stream into a single String with the following parameters:<br\/>* Delimiter (&#8220;-&#8220;):Inserted between each element.<br\/>* Prefix (&#8220;=&#8221;):Inserted at the beginning of the result.<br\/>* Suffix (&#8220;&#8221;):Inserted at the end of the result.<br\/>Therefore, the elements &#8220;US&#8221; and &#8220;UK&#8221; are concatenated with &#8220;-&#8221; between them, resulting in &#8220;US-UK&#8221;. The prefix &#8220;=&#8221; is added at the beginning, resulting in the final output =US-UK.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(1,this)' id='btn-1' value='See Answer'  \/><input type='hidden' id='questionType1' value='radio' class=''><\/div><div class='watu-question' id='question-2'><div class='question-content'><p><strong>Q21.<\/strong> Given:<br \/>java<br \/>DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();<br \/>stats1.accept(4.5);<br \/>stats1.accept(6.0);<br \/>DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();<br \/>stats2.accept(3.0);<br \/>stats2.accept(8.5);<br \/>stats1.combine(stats2);<br \/>System.out.println(&#8220;Sum: &#8221; + stats1.getSum() + &#8220;, Max: &#8221; + stats1.getMax() + &#8220;, Avg: &#8221; + stats1.getAverage()); What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23771' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91983' \/><div class='watu-question-choice'><input type='radio' name='answer-23771[]' id='answer-id-91983' class='answer answer-2 php-answer-label answerof-23771' value='91983' \/>&nbsp;<label for='answer-id-91983' id='answer-label-91983' class='php-answer-label answer label-2'><span class='answer'>Sum: 22.0, Max: 8.5, Avg: 5.5<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91984' \/><div class='watu-question-choice'><input type='radio' name='answer-23771[]' id='answer-id-91984' class='answer answer-2 js-answer-label answerof-23771' value='91984' \/>&nbsp;<label for='answer-id-91984' id='answer-label-91984' class='js-answer-label answer label-2'><span class='answer'>Sum: 22.0, Max: 8.5, Avg: 5.0<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91985' \/><div class='watu-question-choice'><input type='radio' name='answer-23771[]' id='answer-id-91985' class='answer answer-2 js-answer-label answerof-23771' value='91985' \/>&nbsp;<label for='answer-id-91985' id='answer-label-91985' class='js-answer-label answer label-2'><span class='answer'>An exception is thrown at runtime.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91986' \/><div class='watu-question-choice'><input type='radio' name='answer-23771[]' id='answer-id-91986' class='answer answer-2 js-answer-label answerof-23771' value='91986' \/>&nbsp;<label for='answer-id-91986' id='answer-label-91986' class='js-answer-label answer label-2'><span class='answer'>Compilation fails.<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>The DoubleSummaryStatistics class in Java is part of the java.util package and is used to collect and summarize statistics for a stream of double values. Let&#8217;s analyze how the methods work:<br\/>* Initialization and Data Insertion<br\/>* stats1.accept(4.5); # Adds 4.5 to stats1.<br\/>* stats1.accept(6.0); # Adds 6.0 to stats1.<br\/>* stats2.accept(3.0); # Adds 3.0 to stats2.<br\/>* stats2.accept(8.5); # Adds 8.5 to stats2.<br\/>* Combining stats1 and stats2<br\/>* stats1.combine(stats2); merges stats2 into stats1, resulting in one statistics summary containing all values {4.5, 6.0, 3.0, 8.5}.<br\/>* Calculating Output Values<br\/>* Sum= 4.5 + 6.0 + 3.0 + 8.5 = 22.0<br\/>* Max= 8.5<br\/>* Average= (22.0) \/ 4 = 5.5<br\/>Thus, the output is:<br\/>yaml<br\/>Sum: 22.0, Max: 8.5, Avg: 5.5<br\/>References:<br\/>* Java SE 21 &amp; JDK 21 &#8211; DoubleSummaryStatistics<br\/>* Java SE 21 &#8211; Streams and Statistical Operations<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(2,this)' id='btn-2' value='See Answer'  \/><input type='hidden' id='questionType2' value='radio' class=''><\/div><div class='watu-question' id='question-3'><div class='question-content'><p><strong>Q22.<\/strong> Given:<br \/>java<br \/>package vehicule.parent;<br \/>public class Car {<br \/>protected String brand = &#8220;Peugeot&#8221;;<br \/>}<br \/>and<br \/>java<br \/>package vehicule.child;<br \/>import vehicule.parent.Car;<br \/>public class MiniVan extends Car {<br \/>public static void main(String[] args) {<br \/>Car car = new Car();<br \/>car.brand = &#8220;Peugeot 807&#8221;;<br \/>System.out.println(car.brand);<br \/>}<br \/>}<br \/>What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23772' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91987' \/><div class='watu-question-choice'><input type='radio' name='answer-23772[]' id='answer-id-91987' class='answer answer-3 js-answer-label answerof-23772' value='91987' \/>&nbsp;<label for='answer-id-91987' id='answer-label-91987' class='js-answer-label answer label-3'><span class='answer'>Peugeot<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91988' \/><div class='watu-question-choice'><input type='radio' name='answer-23772[]' id='answer-id-91988' class='answer answer-3 js-answer-label answerof-23772' value='91988' \/>&nbsp;<label for='answer-id-91988' id='answer-label-91988' class='js-answer-label answer label-3'><span class='answer'>Peugeot 807<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91989' \/><div class='watu-question-choice'><input type='radio' name='answer-23772[]' id='answer-id-91989' class='answer answer-3 js-answer-label answerof-23772' value='91989' \/>&nbsp;<label for='answer-id-91989' id='answer-label-91989' class='js-answer-label answer label-3'><span class='answer'>An exception is thrown at runtime.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91990' \/><div class='watu-question-choice'><input type='radio' name='answer-23772[]' id='answer-id-91990' class='answer answer-3 php-answer-label answerof-23772' value='91990' \/>&nbsp;<label for='answer-id-91990' id='answer-label-91990' class='php-answer-label answer label-3'><span class='answer'>Compilation fails.<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In Java,protected memberscan only be accessedwithin the same packageor bysubclasses, but there is a key restriction:<br\/>* A protected member of a superclass is only accessible through inheritance in a subclass but not through an instance of the superclass that is declared outside the package.<br\/>Why does compilation fail?<br\/>In the MiniVan class, the following line causes acompilation error:<br\/>java<br\/>Car car = new Car();<br\/>car.brand = &#8220;Peugeot 807&#8221;;<br\/>* The brand field isprotectedin Car, which means it isnot accessible via an instance of Car outside the vehicule.parent package.<br\/>* Even though MiniVan extends Car, itcannotaccess brand using a Car instance (car.brand) because car is declared as an instance of Car, not MiniVan.<br\/>* The correct way to access brand inside MiniVan is through inheritance (this.brand or super.brand).<br\/>Corrected Code<br\/>If we change the MiniVan class like this, it will compile and run successfully:<br\/>java<br\/>package vehicule.child;<br\/>import vehicule.parent.Car;<br\/>public class MiniVan extends Car {<br\/>public static void main(String[] args) {<br\/>MiniVan minivan = new MiniVan(); \/\/ Access via inheritance<br\/>minivan.brand = &#8220;Peugeot 807&#8221;;<br\/>System.out.println(minivan.brand);<br\/>}<br\/>}<br\/>This would output:<br\/>nginx<br\/>Peugeot 807<br\/>Key Rule from Oracle Java Documentation<br\/>* Protected membersof a class are accessible withinthe same packageand tosubclasses, butonly through inheritance, not through a superclass instance declared outside the package.<br\/>References:<br\/>* Java SE 21 &amp; JDK 21 &#8211; Controlling Access to Members of a Class<br\/>* Java SE 21 &amp; JDK 21 &#8211; Inheritance Rules<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(3,this)' id='btn-3' value='See Answer'  \/><input type='hidden' id='questionType3' value='radio' class=''><\/div><div class='watu-question' id='question-4'><div class='question-content'><p><strong>Q23.<\/strong> Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23773' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91991' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23773[]' id='answer-id-91991' class='answer answer-4 php-answer-label answerof-23773' value='91991' \/>&nbsp;<label for='answer-id-91991' id='answer-label-91991' class='php-answer-label answer label-4'><span class='answer'>MyService service = ServiceLoader.load(MyService.class).iterator().next();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91992' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23773[]' id='answer-id-91992' class='answer answer-4 php-answer-label answerof-23773' value='91992' \/>&nbsp;<label for='answer-id-91992' id='answer-label-91992' class='php-answer-label answer label-4'><span class='answer'>MyService service = ServiceLoader.load(MyService.class).findFirst().get();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91993' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23773[]' id='answer-id-91993' class='answer answer-4 js-answer-label answerof-23773' value='91993' \/>&nbsp;<label for='answer-id-91993' id='answer-label-91993' class='js-answer-label answer label-4'><span class='answer'>MyService service = ServiceLoader.getService(MyService.class);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91994' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23773[]' id='answer-id-91994' class='answer answer-4 js-answer-label answerof-23773' value='91994' \/>&nbsp;<label for='answer-id-91994' id='answer-label-91994' class='js-answer-label answer label-4'><span class='answer'>MyService service = ServiceLoader.services(MyService.class).getFirstInstance();<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>The ServiceLoader class in Java is used to load service providers implementing a given service interface. The following methods are evaluated for their correctness in loading an implementation of MyService:<br\/>* A. MyService service = ServiceLoader.load(MyService.class).iterator().next(); This method uses the ServiceLoader.load(MyService.class) to create a ServiceLoader instance for MyService.<br\/>Calling iterator().next() retrieves the next available service provider. If no providers are available, a NoSuchElementException will be thrown. This approach is correct but requires handling the potential exception if no providers are found.<br\/>* B. MyService service = ServiceLoader.load(MyService.class).findFirst().get(); This method utilizes the findFirst() method introduced in Java 9, which returns an Optional describing the first available service provider. Calling get() on the Optional retrieves the service provider if present; otherwise, a NoSuchElementException is thrown. This approach is correct and provides a more concise way to obtain the first service provider.<br\/>* C. MyService service = ServiceLoader.getService(MyService.class);<br\/>The ServiceLoader class does not have a method named getService. Therefore, this method is incorrect and will result in a compilation error.<br\/>* D. MyService service = ServiceLoader.services(MyService.class).getFirstInstance(); The ServiceLoader class does not have a method named services or getFirstInstance. Therefore, this method is incorrect and will result in a compilation error.<br\/>In summary, options A and B are correct methods to load an implementation of MyService using ServiceLoader.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(4,this)' id='btn-4' value='See Answer'  \/><input type='hidden' id='questionType4' value='checkbox' class=''><\/div><div class='watu-question' id='question-5'><div class='question-content'><p><strong>Q24.<\/strong> Given:<br \/>java<br \/>String textBlock = &#8220;&#8221;&#8221;<br \/>j <br \/>a t<br \/>v s<br \/>a <br \/>&#8220;&#8221;&#8221;;<br \/>System.out.println(textBlock.length());<br \/>What is the output?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23774' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91995' \/><div class='watu-question-choice'><input type='radio' name='answer-23774[]' id='answer-id-91995' class='answer answer-5 js-answer-label answerof-23774' value='91995' \/>&nbsp;<label for='answer-id-91995' id='answer-label-91995' class='js-answer-label answer label-5'><span class='answer'>11<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91996' \/><div class='watu-question-choice'><input type='radio' name='answer-23774[]' id='answer-id-91996' class='answer answer-5 php-answer-label answerof-23774' value='91996' \/>&nbsp;<label for='answer-id-91996' id='answer-label-91996' class='php-answer-label answer label-5'><span class='answer'>12<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91997' \/><div class='watu-question-choice'><input type='radio' name='answer-23774[]' id='answer-id-91997' class='answer answer-5 js-answer-label answerof-23774' value='91997' \/>&nbsp;<label for='answer-id-91997' id='answer-label-91997' class='js-answer-label answer label-5'><span class='answer'>14<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91998' \/><div class='watu-question-choice'><input type='radio' name='answer-23774[]' id='answer-id-91998' class='answer answer-5 js-answer-label answerof-23774' value='91998' \/>&nbsp;<label for='answer-id-91998' id='answer-label-91998' class='js-answer-label answer label-5'><span class='answer'>10<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, a text block is defined using the &#8220;&#8221;&#8221; syntax introduced in Java 13. Text blocks allow for multiline string literals, preserving the format as written in the code.<br\/>Text Block Analysis:<br\/>The text block is defined as:<br\/>java<br\/>String textBlock = &#8220;&#8221;&#8221;<br\/>j \\<br\/>a \\t<br\/>contentReference[oaicite:0]{index=0}<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(5,this)' id='btn-5' value='See Answer'  \/><input type='hidden' id='questionType5' value='radio' class=''><\/div><div class='watu-question' id='question-6'><div class='question-content'><p><strong>Q25.<\/strong> Given:<br \/>java<br \/>interface Calculable {<br \/>long calculate(int i);<br \/>}<br \/>public class Test {<br \/>public static void main(String[] args) {<br \/>Calculable c1 = i -&gt; i + 1; \/\/ Line 1<br \/>Calculable c2 = i -&gt; Long.valueOf(i); \/\/ Line 2<br \/>Calculable c3 = i -&gt; { throw new ArithmeticException(); }; \/\/ Line 3<br \/>}<br \/>}<br \/>Which lines fail to compile?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23775' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='91999' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-91999' class='answer answer-6 js-answer-label answerof-23775' value='91999' \/>&nbsp;<label for='answer-id-91999' id='answer-label-91999' class='js-answer-label answer label-6'><span class='answer'>Line 1 and line 3<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92000' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92000' class='answer answer-6 js-answer-label answerof-23775' value='92000' \/>&nbsp;<label for='answer-id-92000' id='answer-label-92000' class='js-answer-label answer label-6'><span class='answer'>Line 2 only<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92001' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92001' class='answer answer-6 js-answer-label answerof-23775' value='92001' \/>&nbsp;<label for='answer-id-92001' id='answer-label-92001' class='js-answer-label answer label-6'><span class='answer'>Line 1 only<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92002' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92002' class='answer answer-6 js-answer-label answerof-23775' value='92002' \/>&nbsp;<label for='answer-id-92002' id='answer-label-92002' class='js-answer-label answer label-6'><span class='answer'>Line 1 and line 2<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92003' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92003' class='answer answer-6 js-answer-label answerof-23775' value='92003' \/>&nbsp;<label for='answer-id-92003' id='answer-label-92003' class='js-answer-label answer label-6'><span class='answer'>Line 2 and line 3<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92004' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92004' class='answer answer-6 js-answer-label answerof-23775' value='92004' \/>&nbsp;<label for='answer-id-92004' id='answer-label-92004' class='js-answer-label answer label-6'><span class='answer'>Line 3 only<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92005' \/><div class='watu-question-choice'><input type='radio' name='answer-23775[]' id='answer-id-92005' class='answer answer-6 php-answer-label answerof-23775' value='92005' \/>&nbsp;<label for='answer-id-92005' id='answer-label-92005' class='php-answer-label answer label-6'><span class='answer'>The program successfully compiles<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, the Calculable interface defines a single abstract method calculate that takes an int parameter and returns a long. The main method contains three lambda expressions assigned to variables c1, c2, and c3 of type Calculable.<br\/>* Line 1:Calculable c1 = i -&gt; i + 1;<br\/>This lambda expression takes an integer i and returns the result of i + 1. Since the expression i + 1 results in an int, and Java allows implicit widening conversion from int to long, this line compiles successfully.<br\/>* Line 2:Calculable c2 = i -&gt; Long.valueOf(i);<br\/>Here, the lambda expression takes an integer i and returns the result of Long.valueOf(i). The Long.valueOf (int i) method returns a Long object. However, Java allows unboxing of the Long object to a long primitive type when necessary. Therefore, this line compiles successfully.<br\/>* Line 3:Calculable c3 = i -&gt; { throw new ArithmeticException(); };<br\/>This lambda expression takes an integer i and throws an ArithmeticException. Since the method calculate has a return type of long, and throwing an exception is a valid way to exit the method without returning a value, this line compiles successfully.<br\/>Since all three lines adhere to the method signature defined in the Calculable interface and there are no type mismatches or syntax errors, the program compiles successfully.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(6,this)' id='btn-6' value='See Answer'  \/><input type='hidden' id='questionType6' value='radio' class=''><\/div><div class='watu-question' id='question-7'><div class='question-content'><p><strong>Q26.<\/strong> Given:<br \/>java<br \/>public class ExceptionPropagation {<br \/>public static void main(String[] args) {<br \/>try {<br \/>thrower();<br \/>System.out.print(&#8220;Dom Perignon, &#8220;);<br \/>} catch (Exception e) {<br \/>System.out.print(&#8220;Chablis, &#8220;);<br \/>} finally {<br \/>System.out.print(&#8220;Saint-Emilion&#8221;);<br \/>}<br \/>}<br \/>static int thrower() {<br \/>try {<br \/>int i = 0;<br \/>return i \/ i;<br \/>} catch (NumberFormatException e) {<br \/>System.out.print(&#8220;Rose&#8221;);<br \/>return -1;<br \/>} finally {<br \/>System.out.print(&#8220;Beaujolais Nouveau, &#8220;);<br \/>}<br \/>}<br \/>}<br \/>What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23776' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92006' \/><div class='watu-question-choice'><input type='radio' name='answer-23776[]' id='answer-id-92006' class='answer answer-7 js-answer-label answerof-23776' value='92006' \/>&nbsp;<label for='answer-id-92006' id='answer-label-92006' class='js-answer-label answer label-7'><span class='answer'>Saint-Emilion<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92007' \/><div class='watu-question-choice'><input type='radio' name='answer-23776[]' id='answer-id-92007' class='answer answer-7 php-answer-label answerof-23776' value='92007' \/>&nbsp;<label for='answer-id-92007' id='answer-label-92007' class='php-answer-label answer label-7'><span class='answer'>Beaujolais Nouveau, Chablis, Saint-Emilion<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92008' \/><div class='watu-question-choice'><input type='radio' name='answer-23776[]' id='answer-id-92008' class='answer answer-7 js-answer-label answerof-23776' value='92008' \/>&nbsp;<label for='answer-id-92008' id='answer-label-92008' class='js-answer-label answer label-7'><span class='answer'>Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92009' \/><div class='watu-question-choice'><input type='radio' name='answer-23776[]' id='answer-id-92009' class='answer answer-7 js-answer-label answerof-23776' value='92009' \/>&nbsp;<label for='answer-id-92009' id='answer-label-92009' class='js-answer-label answer label-7'><span class='answer'>Rose<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Analyzing the thrower() Method Execution<br\/>java<br\/>int i = 0;<br\/>return i \/ i;<br\/>* i \/ i evaluates to 0 \/ 0, whichthrows ArithmeticException (\/ by zero).<br\/>* Since catch (NumberFormatException e) doesnot matchArithmeticException, it is skipped.<br\/>* The finally block always executes, printing:<br\/>nginx<br\/>Beaujolais Nouveau,<br\/>* The exceptionpropagates backto main().<br\/>* Handling the Exception in main()<br\/>java<br\/>try {<br\/>thrower();<br\/>System.out.print(&#8220;Dom Perignon, &#8220;);<br\/>} catch (Exception e) {<br\/>System.out.print(&#8220;Chablis, &#8220;);<br\/>} finally {<br\/>System.out.print(&#8220;Saint-Emilion&#8221;);<br\/>}<br\/>* Since thrower() throws ArithmeticException, it is caught by catch (Exception e).<br\/>* &#8220;Chablis, &#8220;is printed.<br\/>* Thefinally block always executes, printing &#8220;Saint-Emilion&#8221;.<br\/>* Final Output<br\/>nginx<br\/>Beaujolais Nouveau, Chablis, Saint-Emilion<br\/>Thus, the correct answer is:Beaujolais Nouveau, Chablis, Saint-Emilion<br\/>References:<br\/>* Java SE 21 &#8211; Exception Handling<br\/>* Java SE 21 &#8211; finally Block Execution<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(7,this)' id='btn-7' value='See Answer'  \/><input type='hidden' id='questionType7' value='radio' class=''><\/div><div class='watu-question' id='question-8'><div class='question-content'><p><strong>Q27.<\/strong> Given a properties file on the classpath named Person.properties with the content:<br \/>ini<br \/>name=James<br \/>And:<br \/>java<br \/>public class Person extends ListResourceBundle {<br \/>protected Object[][] getContents() {<br \/>return new Object[][]{<br \/>{&#8220;name&#8221;, &#8220;Jeanne&#8221;}<br \/>};<br \/>}<br \/>}<br \/>And:<br \/>java<br \/>public class Test {<br \/>public static void main(String[] args) {<br \/>ResourceBundle bundle = ResourceBundle.getBundle(&#8220;Person&#8221;);<br \/>String name = bundle.getString(&#8220;name&#8221;);<br \/>System.out.println(name);<br \/>}<br \/>}<br \/>What is the given program&#8217;s output?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23777' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92010' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92010' class='answer answer-8 js-answer-label answerof-23777' value='92010' \/>&nbsp;<label for='answer-id-92010' id='answer-label-92010' class='js-answer-label answer label-8'><span class='answer'>MissingResourceException<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92011' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92011' class='answer answer-8 js-answer-label answerof-23777' value='92011' \/>&nbsp;<label for='answer-id-92011' id='answer-label-92011' class='js-answer-label answer label-8'><span class='answer'>Compilation fails<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92012' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92012' class='answer answer-8 js-answer-label answerof-23777' value='92012' \/>&nbsp;<label for='answer-id-92012' id='answer-label-92012' class='js-answer-label answer label-8'><span class='answer'>James<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92013' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92013' class='answer answer-8 js-answer-label answerof-23777' value='92013' \/>&nbsp;<label for='answer-id-92013' id='answer-label-92013' class='js-answer-label answer label-8'><span class='answer'>JeanneJames<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92014' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92014' class='answer answer-8 js-answer-label answerof-23777' value='92014' \/>&nbsp;<label for='answer-id-92014' id='answer-label-92014' class='js-answer-label answer label-8'><span class='answer'>JamesJeanne<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92015' \/><div class='watu-question-choice'><input type='radio' name='answer-23777[]' id='answer-id-92015' class='answer answer-8 php-answer-label answerof-23777' value='92015' \/>&nbsp;<label for='answer-id-92015' id='answer-label-92015' class='php-answer-label answer label-8'><span class='answer'>Jeanne<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this scenario, we have a Person class that extends ListResourceBundle and a properties file named Person.<br\/>properties. Both define a resource with the key &#8220;name&#8221; but with different values:<br\/>* Person class (ListResourceBundle):Defines the key &#8220;name&#8221; with the value &#8220;Jeanne&#8221;.<br\/>* Person.properties file:Defines the key &#8220;name&#8221; with the value &#8220;James&#8221;.<br\/>When the ResourceBundle.getBundle(&#8220;Person&#8221;) method is called, the Java runtime searches for a resource bundle with the base name &#8220;Person&#8221;. The search order is as follows:<br\/>* Class-Based Resource Bundle:The runtime first looks for a class named Person (i.e., Person.class).<br\/>* Properties File Resource Bundle:If the class is not found, it then looks for a properties file named Person.properties.<br\/>In this case, since the Person class is present and accessible, the runtime will load the Person class as the resource bundle. Therefore, the getBundle method returns an instance of the Person class.<br\/>Subsequently, when bundle.getString(&#8220;name&#8221;) is called, it retrieves the value associated with the key &#8220;name&#8221; from the Person class, which is &#8220;Jeanne&#8221;.<br\/>Thus, the output of the program is:<br\/>nginx<br\/>Jeanne<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(8,this)' id='btn-8' value='See Answer'  \/><input type='hidden' id='questionType8' value='radio' class=''><\/div><div class='watu-question' id='question-9'><div class='question-content'><p><strong>Q28.<\/strong> Given:<br \/>java<br \/>Runnable task1 = () -&gt; System.out.println(&#8220;Executing Task-1&#8221;);<br \/>Callable&lt;String&gt; task2 = () -&gt; {<br \/>System.out.println(&#8220;Executing Task-2&#8221;);<br \/>return &#8220;Task-2 Finish.&#8221;;<br \/>};<br \/>ExecutorService execService = Executors.newCachedThreadPool();<br \/>\/\/ INSERT CODE HERE<br \/>execService.awaitTermination(3, TimeUnit.SECONDS);<br \/>execService.shutdownNow();<br \/>Which of the following statements, inserted in the code above, printsboth:<br \/>&#8220;Executing Task-2&#8221; and &#8220;Executing Task-1&#8221;?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23778' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92016' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92016' class='answer answer-9 js-answer-label answerof-23778' value='92016' \/>&nbsp;<label for='answer-id-92016' id='answer-label-92016' class='js-answer-label answer label-9'><span class='answer'>execService.call(task1);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92017' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92017' class='answer answer-9 js-answer-label answerof-23778' value='92017' \/>&nbsp;<label for='answer-id-92017' id='answer-label-92017' class='js-answer-label answer label-9'><span class='answer'>execService.call(task2);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92018' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92018' class='answer answer-9 js-answer-label answerof-23778' value='92018' \/>&nbsp;<label for='answer-id-92018' id='answer-label-92018' class='js-answer-label answer label-9'><span class='answer'>execService.execute(task1);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92019' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92019' class='answer answer-9 js-answer-label answerof-23778' value='92019' \/>&nbsp;<label for='answer-id-92019' id='answer-label-92019' class='js-answer-label answer label-9'><span class='answer'>execService.execute(task2);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92020' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92020' class='answer answer-9 js-answer-label answerof-23778' value='92020' \/>&nbsp;<label for='answer-id-92020' id='answer-label-92020' class='js-answer-label answer label-9'><span class='answer'>execService.run(task1);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92021' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92021' class='answer answer-9 js-answer-label answerof-23778' value='92021' \/>&nbsp;<label for='answer-id-92021' id='answer-label-92021' class='js-answer-label answer label-9'><span class='answer'>execService.run(task2);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92022' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92022' class='answer answer-9 php-answer-label answerof-23778' value='92022' \/>&nbsp;<label for='answer-id-92022' id='answer-label-92022' class='php-answer-label answer label-9'><span class='answer'>execService.submit(task1);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92023' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23778[]' id='answer-id-92023' class='answer answer-9 php-answer-label answerof-23778' value='92023' \/>&nbsp;<label for='answer-id-92023' id='answer-label-92023' class='php-answer-label answer label-9'><span class='answer'>execService.submit(task2);<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Understanding ExecutorService Methods<br\/>* execute(Runnable command)<br\/>* Runs the task but only supports Runnable (not Callable).<br\/>* #execService.execute(task2); fails because task2 is Callable&lt;String&gt;.<br\/>* submit(Runnable task)<br\/>* Submits a Runnable task for execution.<br\/>* execService.submit(task1); executes &#8220;Executing Task-1&#8221;.<br\/>* submit(Callable&lt;T&gt; task)<br\/>* Submits a Callable&lt;T&gt; task for execution.<br\/>* execService.submit(task2); executes &#8220;Executing Task-2&#8221;.<br\/>* call() Does Not Exist in ExecutorService<br\/>* #execService.call(task1); and execService.call(task2); are invalid.<br\/>* run() Does Not Exist in ExecutorService<br\/>* #execService.run(task1); and execService.run(task2); are invalid.<br\/>* Correct Code to Print Both Messages:<br\/>java<br\/>execService.submit(task1);<br\/>execService.submit(task2);<br\/>Thus, the correct answer is:execService.submit(task1); execService.submit(task2); References:<br\/>* Java SE 21 &#8211; ExecutorService<br\/>* Java SE 21 &#8211; Callable and Runnable<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(9,this)' id='btn-9' value='See Answer'  \/><input type='hidden' id='questionType9' value='checkbox' class=''><\/div><div class='watu-question' id='question-10'><div class='question-content'><p><strong>Q29.<\/strong> Given:<br \/>java<br \/>sealed class Vehicle permits Car, Bike {<br \/>}<br \/>non-sealed class Car extends Vehicle {<br \/>}<br \/>final class Bike extends Vehicle {<br \/>}<br \/>public class SealedClassTest {<br \/>public static void main(String[] args) {<br \/>Class&lt;?&gt; vehicleClass = Vehicle.class;<br \/>Class&lt;?&gt; carClass = Car.class;<br \/>Class&lt;?&gt; bikeClass = Bike.class;<br \/>System.out.print(&#8220;Is Vehicle sealed? &#8221; + vehicleClass.isSealed() +<br \/>&#8220;; Is Car sealed? &#8221; + carClass.isSealed() +<br \/>&#8220;; Is Bike sealed? &#8221; + bikeClass.isSealed());<br \/>}<br \/>}<br \/>What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23779' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92024' \/><div class='watu-question-choice'><input type='radio' name='answer-23779[]' id='answer-id-92024' class='answer answer-10 js-answer-label answerof-23779' value='92024' \/>&nbsp;<label for='answer-id-92024' id='answer-label-92024' class='js-answer-label answer label-10'><span class='answer'>Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92025' \/><div class='watu-question-choice'><input type='radio' name='answer-23779[]' id='answer-id-92025' class='answer answer-10 js-answer-label answerof-23779' value='92025' \/>&nbsp;<label for='answer-id-92025' id='answer-label-92025' class='js-answer-label answer label-10'><span class='answer'>Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92026' \/><div class='watu-question-choice'><input type='radio' name='answer-23779[]' id='answer-id-92026' class='answer answer-10 php-answer-label answerof-23779' value='92026' \/>&nbsp;<label for='answer-id-92026' id='answer-label-92026' class='php-answer-label answer label-10'><span class='answer'>Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92027' \/><div class='watu-question-choice'><input type='radio' name='answer-23779[]' id='answer-id-92027' class='answer answer-10 js-answer-label answerof-23779' value='92027' \/>&nbsp;<label for='answer-id-92027' id='answer-label-92027' class='js-answer-label answer label-10'><span class='answer'>Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Understanding Sealed Classes in Java<br\/>* Asealed classrestricts which other classes can extend it.<br\/>* A sealed classmust explicitly declare its permitted subclassesusing the permits keyword.<br\/>* Subclasses can be declared as:<br\/>* sealed(restricts further extension).<br\/>* non-sealed(removes the restriction, allowing unrestricted subclassing).<br\/>* final(prevents further subclassing).<br\/>* Analyzing the Given Code<br\/>* Vehicle is declared as sealed with permits Car, Bike, meaning only Car and Bike can extend it.<br\/>* Car is declared as non-sealed, which means itis no longer sealedand can have subclasses.<br\/>* Bike is declared as final, meaningit cannot be subclassed.<br\/>* Using isSealed() Method<br\/>* vehicleClass.isSealed() #truebecause Vehicle is explicitly marked as sealed.<br\/>* carClass.isSealed() #falsebecause Car is marked non-sealed.<br\/>* bikeClass.isSealed() #falsebecause Bike is final, and a final class isnot considered sealed.<br\/>* Final Output<br\/>csharp<br\/>Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false<br\/>Thus, the correct answer is:&#8221;Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false&#8221; References:<br\/>* Java SE 21 &#8211; Sealed Classes<br\/>* Java SE 21 &#8211; isSealed() Method<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(10,this)' id='btn-10' value='See Answer'  \/><input type='hidden' id='questionType10' value='radio' class=''><\/div><div class='watu-question' id='question-11'><div class='question-content'><p><strong>Q30.<\/strong> Given:<br \/>java<br \/>public class Test {<br \/>class A {<br \/>}<br \/>static class B {<br \/>}<br \/>public static void main(String[] args) {<br \/>\/\/ Insert here<br \/>}<br \/>}<br \/>Which three of the following are valid statements when inserted into the given program?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23780' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92028' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92028' class='answer answer-11 js-answer-label answerof-23780' value='92028' \/>&nbsp;<label for='answer-id-92028' id='answer-label-92028' class='js-answer-label answer label-11'><span class='answer'>A a = new A();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92029' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92029' class='answer answer-11 php-answer-label answerof-23780' value='92029' \/>&nbsp;<label for='answer-id-92029' id='answer-label-92029' class='php-answer-label answer label-11'><span class='answer'>B b = new Test.B();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92030' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92030' class='answer answer-11 js-answer-label answerof-23780' value='92030' \/>&nbsp;<label for='answer-id-92030' id='answer-label-92030' class='js-answer-label answer label-11'><span class='answer'>A a = new Test.A();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92031' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92031' class='answer answer-11 js-answer-label answerof-23780' value='92031' \/>&nbsp;<label for='answer-id-92031' id='answer-label-92031' class='js-answer-label answer label-11'><span class='answer'>B b = new Test().new B();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92032' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92032' class='answer answer-11 php-answer-label answerof-23780' value='92032' \/>&nbsp;<label for='answer-id-92032' id='answer-label-92032' class='php-answer-label answer label-11'><span class='answer'>B b = new B();<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92033' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23780[]' id='answer-id-92033' class='answer answer-11 php-answer-label answerof-23780' value='92033' \/>&nbsp;<label for='answer-id-92033' id='answer-label-92033' class='php-answer-label answer label-11'><span class='answer'>A a = new Test().new A();<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In the provided code, we have two inner classes within the Test class:<br\/>* Class A:<br\/>* An inner (non-static) class.<br\/>* Instances of A are associated with an instance of the enclosing Test class.<br\/>* Class B:<br\/>* A static nested class.<br\/>* Instances of B are not associated with any instance of the enclosing Test class and can be instantiated without an instance of Test.<br\/>Evaluation of Statements:<br\/>A: A a = new A();<br\/>* Invalid.Since A is a non-static inner class, it requires an instance of the enclosing class Test to be instantiated. Attempting to instantiate A without an instance of Test will result in a compilation error.<br\/>B: B b = new Test.B();<br\/>* Valid.B is a static nested class and can be instantiated without an instance of Test. This syntax is correct.<br\/>C: A a = new Test.A();<br\/>* Invalid.Even though A is referenced through Test, it is a non-static inner class and requires an instance of Test for instantiation. This will result in a compilation error.<br\/>D: B b = new Test().new B();<br\/>* Invalid.While this syntax is used for instantiating non-static inner classes, B is a static nested class and does not require an instance of Test. This will result in a compilation error.<br\/>E: B b = new B();<br\/>* Valid.Since B is a static nested class, it can be instantiated directly without referencing the enclosing class.<br\/>F: A a = new Test().new A();<br\/>* Valid.This is the correct syntax for instantiating a non-static inner class. An instance of Test is created, and then an instance of A is created associated with that Test instance.<br\/>Therefore, the valid statements are B, E, and F.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(11,this)' id='btn-11' value='See Answer'  \/><input type='hidden' id='questionType11' value='checkbox' class=''><\/div><div class='watu-question' id='question-12'><div class='question-content'><p><strong>Q31.<\/strong> Which of the following isn&#8217;t a valid option of the jdeps command?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23781' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92034' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92034' class='answer answer-12 php-answer-label answerof-23781' value='92034' \/>&nbsp;<label for='answer-id-92034' id='answer-label-92034' class='php-answer-label answer label-12'><span class='answer'>&#8211;check-deps<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92035' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92035' class='answer answer-12 js-answer-label answerof-23781' value='92035' \/>&nbsp;<label for='answer-id-92035' id='answer-label-92035' class='js-answer-label answer label-12'><span class='answer'>&#8211;generate-open-module<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92036' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92036' class='answer answer-12 js-answer-label answerof-23781' value='92036' \/>&nbsp;<label for='answer-id-92036' id='answer-label-92036' class='js-answer-label answer label-12'><span class='answer'>&#8211;list-deps<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92037' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92037' class='answer answer-12 js-answer-label answerof-23781' value='92037' \/>&nbsp;<label for='answer-id-92037' id='answer-label-92037' class='js-answer-label answer label-12'><span class='answer'>&#8211;generate-module-info<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92038' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92038' class='answer answer-12 js-answer-label answerof-23781' value='92038' \/>&nbsp;<label for='answer-id-92038' id='answer-label-92038' class='js-answer-label answer label-12'><span class='answer'>&#8211;print-module-deps<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92039' \/><div class='watu-question-choice'><input type='radio' name='answer-23781[]' id='answer-id-92039' class='answer answer-12 js-answer-label answerof-23781' value='92039' \/>&nbsp;<label for='answer-id-92039' id='answer-label-92039' class='js-answer-label answer label-12'><span class='answer'>&#8211;list-reduced-deps<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>The jdeps tool is a Java class dependency analyzer that can be used to understand the static dependencies of applications and libraries. It provides several command-line options to customize its behavior.<br\/>Valid jdeps Options:<br\/>* &#8211;generate-open-module: Generates a module declaration (module-info.java) with open directives for the given JAR files or classes.<br\/>* &#8211;list-deps: Lists the immediate dependencies of the specified classes or JAR files.<br\/>* &#8211;generate-module-info: Generates a module declaration (module-info.java) for the given JAR files or classes.<br\/>* &#8211;print-module-deps: Prints the module dependencies of the specified modules or JAR files.<br\/>* &#8211;list-reduced-deps: Lists the reduced dependencies, showing only the packages that are directly depended upon.<br\/>Invalid Option:<br\/>* &#8211;check-deps: There is no &#8211;check-deps option in the jdeps tool.<br\/>Conclusion:<br\/>Option A (&#8211;check-deps) is not a valid option of the jdeps command.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(12,this)' id='btn-12' value='See Answer'  \/><input type='hidden' id='questionType12' value='radio' class=''><\/div><div class='watu-question' id='question-13'><div class='question-content'><p><strong>Q32.<\/strong> What do the following print?<br \/>java<br \/>public class DefaultAndStaticMethods {<br \/>public static void main(String[] args) {<br \/>WithStaticMethod.print();<br \/>}<br \/>}<br \/>interface WithDefaultMethod {<br \/>default void print() {<br \/>System.out.print(&#8220;default&#8221;);<br \/>}<br \/>}<br \/>interface WithStaticMethod extends WithDefaultMethod {<br \/>static void print() {<br \/>System.out.print(&#8220;static&#8221;);<br \/>}<br \/>}<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23782' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92040' \/><div class='watu-question-choice'><input type='radio' name='answer-23782[]' id='answer-id-92040' class='answer answer-13 js-answer-label answerof-23782' value='92040' \/>&nbsp;<label for='answer-id-92040' id='answer-label-92040' class='js-answer-label answer label-13'><span class='answer'>nothing<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92041' \/><div class='watu-question-choice'><input type='radio' name='answer-23782[]' id='answer-id-92041' class='answer answer-13 js-answer-label answerof-23782' value='92041' \/>&nbsp;<label for='answer-id-92041' id='answer-label-92041' class='js-answer-label answer label-13'><span class='answer'>default<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92042' \/><div class='watu-question-choice'><input type='radio' name='answer-23782[]' id='answer-id-92042' class='answer answer-13 js-answer-label answerof-23782' value='92042' \/>&nbsp;<label for='answer-id-92042' id='answer-label-92042' class='js-answer-label answer label-13'><span class='answer'>Compilation fails<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92043' \/><div class='watu-question-choice'><input type='radio' name='answer-23782[]' id='answer-id-92043' class='answer answer-13 php-answer-label answerof-23782' value='92043' \/>&nbsp;<label for='answer-id-92043' id='answer-label-92043' class='php-answer-label answer label-13'><span class='answer'>static<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, we have two interfaces and a class with a main method:<br\/>* WithDefaultMethod Interface:<br\/>* Declares a default method print() that outputs &#8220;default&#8221;.<br\/>* WithStaticMethod Interface:<br\/>* Extends WithDefaultMethod.<br\/>* Declares a static method print() that outputs &#8220;static&#8221;.<br\/>* DefaultAndStaticMethods Class:<br\/>* Contains the main method, which calls WithStaticMethod.print().<br\/>Key Points:<br\/>* Static Methods in Interfaces:<br\/>* Static methods in interfaces are not inherited by implementing or extending classes or interfaces.<br\/>They belong solely to the interface in which they are declared.<br\/>* Default Methods in Interfaces:<br\/>* Default methods can be inherited by implementing classes, but they cannot be overridden by static methods in subinterfaces.<br\/>Execution Flow:<br\/>* The main method calls WithStaticMethod.print().<br\/>* This invokes the static method print() defined in the WithStaticMethod interface, which outputs &#8220;static&#8221;.<br\/>Therefore, the program compiles successfully and prints static.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(13,this)' id='btn-13' value='See Answer'  \/><input type='hidden' id='questionType13' value='radio' class=''><\/div><div class='watu-question' id='question-14'><div class='question-content'><p><strong>Q33.<\/strong> Which of the followingisn&#8217;ta correct way to write a string to a file?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23783' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92044' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92044' class='answer answer-14 js-answer-label answerof-23783' value='92044' \/>&nbsp;<label for='answer-id-92044' id='answer-label-92044' class='js-answer-label answer label-14'><span class='answer'>java<br \/>Path path = Paths.get(&#8220;file.txt&#8221;);<br \/>byte[] strBytes = &#8220;Hello&#8221;.getBytes();<br \/>Files.write(path, strBytes);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92045' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92045' class='answer answer-14 php-answer-label answerof-23783' value='92045' \/>&nbsp;<label for='answer-id-92045' id='answer-label-92045' class='php-answer-label answer label-14'><span class='answer'>java<br \/>try (BufferedWriter writer = new BufferedWriter(&#8220;file.txt&#8221;)) {<br \/>writer.write(&#8220;Hello&#8221;);<br \/>}<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92046' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92046' class='answer answer-14 js-answer-label answerof-23783' value='92046' \/>&nbsp;<label for='answer-id-92046' id='answer-label-92046' class='js-answer-label answer label-14'><span class='answer'>java<br \/>try (FileOutputStream outputStream = new FileOutputStream(&#8220;file.txt&#8221;)) { byte[] strBytes = &#8220;Hello&#8221;.getBytes(); outputStream.write(strBytes);<br \/>}<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92047' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92047' class='answer answer-14 js-answer-label answerof-23783' value='92047' \/>&nbsp;<label for='answer-id-92047' id='answer-label-92047' class='js-answer-label answer label-14'><span class='answer'>java<br \/>try (PrintWriter printWriter = new PrintWriter(&#8220;file.txt&#8221;)) {<br \/>printWriter.printf(&#8220;Hello %s&#8221;, &#8220;James&#8221;);<br \/>}<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92048' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92048' class='answer answer-14 js-answer-label answerof-23783' value='92048' \/>&nbsp;<label for='answer-id-92048' id='answer-label-92048' class='js-answer-label answer label-14'><span class='answer'>None of the suggestions<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92049' \/><div class='watu-question-choice'><input type='radio' name='answer-23783[]' id='answer-id-92049' class='answer answer-14 js-answer-label answerof-23783' value='92049' \/>&nbsp;<label for='answer-id-92049' id='answer-label-92049' class='js-answer-label answer label-14'><span class='answer'>java<br \/>try (FileWriter writer = new FileWriter(&#8220;file.txt&#8221;)) {<br \/>writer.write(&#8220;Hello&#8221;);<br \/>}<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>(BufferedWriter writer = new BufferedWriter(&#8220;file.txt&#8221;) is incorrect.)<br\/>Theincorrect statementisoption Bbecause BufferedWriterdoes nothave a constructor that accepts a String (file name) directly. The correct way to use BufferedWriter is to wrap it around a FileWriter, like this:<br\/>java<br\/>try (BufferedWriter writer = new BufferedWriter(new FileWriter(&#8220;file.txt&#8221;))) { writer.write(&#8220;Hello&#8221;);<br\/>}<br\/>Evaluation of Other Options:<br\/>Option A (Files.write)# Correct<br\/>* Uses Files.write() to write bytes to a file.<br\/>* Efficient and concise method for writing small text files.<br\/>Option C (FileOutputStream)# Correct<br\/>* Uses a FileOutputStream to write raw bytes to a file.<br\/>* Works for both text and binary data.<br\/>Option D (PrintWriter)# Correct<br\/>* Uses PrintWriter for formatted text output.<br\/>Option F (FileWriter)# Correct<br\/>* Uses FileWriter to write text data.<br\/>Option E (None of the suggestions)# Incorrect becauseoption Bis incorrect.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(14,this)' id='btn-14' value='See Answer'  \/><input type='hidden' id='questionType14' value='radio' class=''><\/div><div class='watu-question' id='question-15'><div class='question-content'><p><strong>Q34.<\/strong> What do the following print?<br \/>java<br \/>public class Main {<br \/>int instanceVar = staticVar;<br \/>static int staticVar = 666;<br \/>public static void main(String args[]) {<br \/>System.out.printf(&#8220;%d %d&#8221;, new Main().instanceVar, staticVar);<br \/>}<br \/>static {<br \/>staticVar = 42;<br \/>}<br \/>}<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23784' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92050' \/><div class='watu-question-choice'><input type='radio' name='answer-23784[]' id='answer-id-92050' class='answer answer-15 js-answer-label answerof-23784' value='92050' \/>&nbsp;<label for='answer-id-92050' id='answer-label-92050' class='js-answer-label answer label-15'><span class='answer'>666 42<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92051' \/><div class='watu-question-choice'><input type='radio' name='answer-23784[]' id='answer-id-92051' class='answer answer-15 js-answer-label answerof-23784' value='92051' \/>&nbsp;<label for='answer-id-92051' id='answer-label-92051' class='js-answer-label answer label-15'><span class='answer'>666 666<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92052' \/><div class='watu-question-choice'><input type='radio' name='answer-23784[]' id='answer-id-92052' class='answer answer-15 php-answer-label answerof-23784' value='92052' \/>&nbsp;<label for='answer-id-92052' id='answer-label-92052' class='php-answer-label answer label-15'><span class='answer'>42 42<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92053' \/><div class='watu-question-choice'><input type='radio' name='answer-23784[]' id='answer-id-92053' class='answer answer-15 js-answer-label answerof-23784' value='92053' \/>&nbsp;<label for='answer-id-92053' id='answer-label-92053' class='js-answer-label answer label-15'><span class='answer'>Compilation fails<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, the class Main contains both an instance variable instanceVar and a static variable staticVar. The sequence of initialization and execution is as follows:<br\/>* Static Variable Initialization:<br\/>* staticVar is declared and initialized to 666.<br\/>* Static Block Execution:<br\/>* The static block executes, updating staticVar to 42.<br\/>* Instance Variable Initialization:<br\/>* When a new instance of Main is created, instanceVar is initialized to the current value of staticVar, which is 42.<br\/>* main Method Execution:<br\/>* The main method creates a new instance of Main and prints the values of instanceVar and staticVar.<br\/>Therefore, the output of the program is 42 42.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(15,this)' id='btn-15' value='See Answer'  \/><input type='hidden' id='questionType15' value='radio' class=''><\/div><div class='watu-question' id='question-16'><div class='question-content'><p><strong>Q35.<\/strong> Given:<br \/>java<br \/>LocalDate localDate = LocalDate.of(2020, 8, 8);<br \/>Date date = java.sql.Date.valueOf(localDate);<br \/>DateFormat formatter = new SimpleDateFormat(\/* pattern *\/);<br \/>String output = formatter.format(date);<br \/>System.out.println(output);<br \/>It&#8217;s known that the given code prints out &#8220;August 08&#8221;.<br \/>Which of the following should be inserted as the pattern?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23785' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92054' \/><div class='watu-question-choice'><input type='radio' name='answer-23785[]' id='answer-id-92054' class='answer answer-16 js-answer-label answerof-23785' value='92054' \/>&nbsp;<label for='answer-id-92054' id='answer-label-92054' class='js-answer-label answer label-16'><span class='answer'>MM d<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92055' \/><div class='watu-question-choice'><input type='radio' name='answer-23785[]' id='answer-id-92055' class='answer answer-16 js-answer-label answerof-23785' value='92055' \/>&nbsp;<label for='answer-id-92055' id='answer-label-92055' class='js-answer-label answer label-16'><span class='answer'>MM dd<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92056' \/><div class='watu-question-choice'><input type='radio' name='answer-23785[]' id='answer-id-92056' class='answer answer-16 php-answer-label answerof-23785' value='92056' \/>&nbsp;<label for='answer-id-92056' id='answer-label-92056' class='php-answer-label answer label-16'><span class='answer'>MMMM dd<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92057' \/><div class='watu-question-choice'><input type='radio' name='answer-23785[]' id='answer-id-92057' class='answer answer-16 js-answer-label answerof-23785' value='92057' \/>&nbsp;<label for='answer-id-92057' id='answer-label-92057' class='js-answer-label answer label-16'><span class='answer'>MMM dd<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>To achieve the output &#8220;August 08&#8221;, the SimpleDateFormat pattern must format the month in its full textual form and the day as a two-digit number.<br\/>* Pattern Analysis:<br\/>* MMMM: Represents the full name of the month (e.g., &#8220;August&#8221;).<br\/>* dd: Represents the day of the month as a two-digit number, with leading zeros if necessary (e.g.,<br\/>&#8220;08&#8221;).<br\/>Therefore, the correct pattern to produce the desired output is MMMM dd.<br\/>* Option Evaluations:<br\/>* A. MM d: Formats the month as a two-digit number and the day as a single or two-digit number without leading zeros. For example, &#8220;08 8&#8221;.<br\/>* B. MM dd: Formats the month and day both as two-digit numbers. For example, &#8220;08 08&#8221;.<br\/>* C. MMMM dd: Formats the month as its full name and the day as a two-digit number. For example, &#8220;August 08&#8221;.<br\/>* D. MMM dd: Formats the month as its abbreviated name and the day as a two-digit number. For example, &#8220;Aug 08&#8221;.<br\/>Thus, option C (MMMM dd) is the correct choice to match the output &#8220;August 08&#8221;.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(16,this)' id='btn-16' value='See Answer'  \/><input type='hidden' id='questionType16' value='radio' class=''><\/div><div class='watu-question' id='question-17'><div class='question-content'><p><strong>Q36.<\/strong> Which of the following statements is correct about a final class?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23786' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92058' \/><div class='watu-question-choice'><input type='radio' name='answer-23786[]' id='answer-id-92058' class='answer answer-17 js-answer-label answerof-23786' value='92058' \/>&nbsp;<label for='answer-id-92058' id='answer-label-92058' class='js-answer-label answer label-17'><span class='answer'>The final keyword in its declaration must go right before the class keyword.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92059' \/><div class='watu-question-choice'><input type='radio' name='answer-23786[]' id='answer-id-92059' class='answer answer-17 js-answer-label answerof-23786' value='92059' \/>&nbsp;<label for='answer-id-92059' id='answer-label-92059' class='js-answer-label answer label-17'><span class='answer'>It must contain at least a final method.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92060' \/><div class='watu-question-choice'><input type='radio' name='answer-23786[]' id='answer-id-92060' class='answer answer-17 php-answer-label answerof-23786' value='92060' \/>&nbsp;<label for='answer-id-92060' id='answer-label-92060' class='php-answer-label answer label-17'><span class='answer'>It cannot be extended by any other class.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92061' \/><div class='watu-question-choice'><input type='radio' name='answer-23786[]' id='answer-id-92061' class='answer answer-17 js-answer-label answerof-23786' value='92061' \/>&nbsp;<label for='answer-id-92061' id='answer-label-92061' class='js-answer-label answer label-17'><span class='answer'>It cannot implement any interface.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92062' \/><div class='watu-question-choice'><input type='radio' name='answer-23786[]' id='answer-id-92062' class='answer answer-17 js-answer-label answerof-23786' value='92062' \/>&nbsp;<label for='answer-id-92062' id='answer-label-92062' class='js-answer-label answer label-17'><span class='answer'>It cannot extend another class.<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In Java, the final keyword can be applied to classes, methods, and variables to impose certain restrictions.<br\/>Final Classes:<br\/>* Definition:A class declared with the final keyword is known as a final class.<br\/>* Purpose:Declaring a class as final prevents it from being subclassed. This is useful when you want to ensure that the class&#8217;s implementation remains unchanged and cannot be extended or modified through inheritance.<br\/>Option Evaluations:<br\/>* A. The final keyword in its declaration must go right before the class keyword.<br\/>* This is correct. The syntax for declaring a final class is:<br\/>java<br\/>public final class ClassName {<br\/>\/\/ class body<br\/>}<br\/>* However, this statement is about syntax rather than the core characteristic of a final class.<br\/>* B. It must contain at least a final method.<br\/>* Incorrect. A final class can have zero or more methods, and none of them are required to be declared as final. The final keyword at the class level prevents inheritance, regardless of the methods&#8217; finality.<br\/>* C. It cannot be extended by any other class.<br\/>* Correct. The primary characteristic of a final class is that it cannot be subclassed. Attempting to do so will result in a compilation error.<br\/>* D. It cannot implement any interface.<br\/>* Incorrect. A final class can implement interfaces. Declaring a class as final restricts inheritance but does not prevent the class from implementing interfaces.<br\/>* E. It cannot extend another class.<br\/>* Incorrect. A final class can extend another class. The final keyword prevents the class from being subclassed but does not prevent it from being a subclass itself.<br\/>Therefore, the correct statement about a final class is option C: &#8220;It cannot be extended by any other class.&#8221;<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(17,this)' id='btn-17' value='See Answer'  \/><input type='hidden' id='questionType17' value='radio' class=''><\/div><div class='watu-question' id='question-18'><div class='question-content'><p><strong>Q37.<\/strong> Given:<br \/>java<br \/>record WithInstanceField(String foo, int bar) {<br \/>double fuz;<br \/>}<br \/>record WithStaticField(String foo, int bar) {<br \/>static double wiz;<br \/>}<br \/>record ExtendingClass(String foo) extends Exception {}<br \/>record ImplementingInterface(String foo) implements Cloneable {}<br \/>Which records compile? (Select 2)<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23787' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92063' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23787[]' id='answer-id-92063' class='answer answer-18 js-answer-label answerof-23787' value='92063' \/>&nbsp;<label for='answer-id-92063' id='answer-label-92063' class='js-answer-label answer label-18'><span class='answer'>ExtendingClass<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92064' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23787[]' id='answer-id-92064' class='answer answer-18 js-answer-label answerof-23787' value='92064' \/>&nbsp;<label for='answer-id-92064' id='answer-label-92064' class='js-answer-label answer label-18'><span class='answer'>WithInstanceField<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92065' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23787[]' id='answer-id-92065' class='answer answer-18 php-answer-label answerof-23787' value='92065' \/>&nbsp;<label for='answer-id-92065' id='answer-label-92065' class='php-answer-label answer label-18'><span class='answer'>ImplementingInterface<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92066' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23787[]' id='answer-id-92066' class='answer answer-18 php-answer-label answerof-23787' value='92066' \/>&nbsp;<label for='answer-id-92066' id='answer-label-92066' class='php-answer-label answer label-18'><span class='answer'>WithStaticField<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In Java, records are a special kind of class designed to act as transparent carriers for immutabledata. They automatically provide implementations for equals(), hashCode(), and toString(), and their fields are final and private by default.<br\/>* Option A: ExtendingClass<br\/>* Analysis: Records in Java implicitly extend java.lang.Record and cannot extend any other class because Java does not support multiple inheritance. Attempting to extend another class, such as Exception, will result in a compilation error.<br\/>* Conclusion: Does not compile.<br\/>* Option B: WithInstanceField<br\/>* Analysis: Records do not allow the declaration of instance fields outside of their components.<br\/>The declaration of double fuz; is not permitted and will cause a compilation error.<br\/>* Conclusion: Does not compile.<br\/>* Option C: ImplementingInterface<br\/>* Analysis: Records can implement interfaces. In this case, ImplementingInterface implements Cloneable, which is valid.<br\/>* Conclusion: Compiles successfully.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(18,this)' id='btn-18' value='See Answer'  \/><input type='hidden' id='questionType18' value='checkbox' class=''><\/div><div class='watu-question' id='question-19'><div class='question-content'><p><strong>Q38.<\/strong> Given:<br \/>java<br \/>try (FileOutputStream fos = new FileOutputStream(&#8220;t.tmp&#8221;);<br \/>ObjectOutputStream oos = new ObjectOutputStream(fos)) {<br \/>fos.write(&#8220;Today&#8221;);<br \/>fos.writeObject(&#8220;Today&#8221;);<br \/>oos.write(&#8220;Today&#8221;);<br \/>oos.writeObject(&#8220;Today&#8221;);<br \/>} catch (Exception ex) {<br \/>\/\/ handle exception<br \/>}<br \/>Which statement compiles?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23788' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92067' \/><div class='watu-question-choice'><input type='radio' name='answer-23788[]' id='answer-id-92067' class='answer answer-19 js-answer-label answerof-23788' value='92067' \/>&nbsp;<label for='answer-id-92067' id='answer-label-92067' class='js-answer-label answer label-19'><span class='answer'>fos.write(&#8220;Today&#8221;);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92068' \/><div class='watu-question-choice'><input type='radio' name='answer-23788[]' id='answer-id-92068' class='answer answer-19 js-answer-label answerof-23788' value='92068' \/>&nbsp;<label for='answer-id-92068' id='answer-label-92068' class='js-answer-label answer label-19'><span class='answer'>fos.writeObject(&#8220;Today&#8221;);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92069' \/><div class='watu-question-choice'><input type='radio' name='answer-23788[]' id='answer-id-92069' class='answer answer-19 js-answer-label answerof-23788' value='92069' \/>&nbsp;<label for='answer-id-92069' id='answer-label-92069' class='js-answer-label answer label-19'><span class='answer'>oos.write(&#8220;Today&#8221;);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92070' \/><div class='watu-question-choice'><input type='radio' name='answer-23788[]' id='answer-id-92070' class='answer answer-19 php-answer-label answerof-23788' value='92070' \/>&nbsp;<label for='answer-id-92070' id='answer-label-92070' class='php-answer-label answer label-19'><span class='answer'>oos.writeObject(&#8220;Today&#8221;);<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In Java, FileOutputStream and ObjectOutputStream are used for writing data to files, but they have different purposes and methods. Let&#8217;s analyze each statement:<br\/>* fos.write(&#8220;Today&#8221;);<br\/>The FileOutputStream class is designed to write raw byte streams to files. The write method in FileOutputStream expects a parameter of type int or byte[]. Since &#8220;Today&#8221; is a String, passing it directly to fos.<br\/>write(&#8220;Today&#8221;); will cause a compilation error because there is no write method in FileOutputStream that accepts a String parameter.<br\/>* fos.writeObject(&#8220;Today&#8221;);<br\/>The FileOutputStream class does not have a method named writeObject. The writeObject method is specific to ObjectOutputStream. Therefore, attempting to call fos.writeObject(&#8220;Today&#8221;); will result in a compilation error.<br\/>* oos.write(&#8220;Today&#8221;);<br\/>The ObjectOutputStream class is used to write objects to an output stream. However, it does not have a write method that accepts a String parameter. The available write methods in ObjectOutputStream are for writing primitive data types and objects. Therefore, oos.write(&#8220;Today&#8221;); will cause a compilation error.<br\/>* oos.writeObject(&#8220;Today&#8221;);<br\/>The ObjectOutputStream class provides the writeObject method, which is used to serialize objects and write them to the output stream. Since String implements the Serializable interface, &#8220;Today&#8221; can be serialized.<br\/>Therefore, oos.writeObject(&#8220;Today&#8221;); is valid and compiles successfully.<br\/>In summary, the only statement that compiles without errors is oos.writeObject(&#8220;Today&#8221;);.<br\/>References:<br\/>* Java SE 21 &amp; JDK 21 &#8211; ObjectOutputStream<br\/>* Java SE 21 &amp; JDK 21 &#8211; FileOutputStream<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(19,this)' id='btn-19' value='See Answer'  \/><input type='hidden' id='questionType19' value='radio' class=''><\/div><div class='watu-question' id='question-20'><div class='question-content'><p><strong>Q39.<\/strong> Given:<br \/>java<br \/>var hauteCouture = new String[]{ &#8220;Chanel&#8221;, &#8220;Dior&#8221;, &#8220;Louis Vuitton&#8221; };<br \/>var i = 0;<br \/>do {<br \/>System.out.print(hauteCouture[i] + &#8221; &#8220;);<br \/>} while (i++ &gt; 0);<br \/>What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23789' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92071' \/><div class='watu-question-choice'><input type='radio' name='answer-23789[]' id='answer-id-92071' class='answer answer-20 php-answer-label answerof-23789' value='92071' \/>&nbsp;<label for='answer-id-92071' id='answer-label-92071' class='php-answer-label answer label-20'><span class='answer'>Chanel<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92072' \/><div class='watu-question-choice'><input type='radio' name='answer-23789[]' id='answer-id-92072' class='answer answer-20 js-answer-label answerof-23789' value='92072' \/>&nbsp;<label for='answer-id-92072' id='answer-label-92072' class='js-answer-label answer label-20'><span class='answer'>Chanel Dior Louis Vuitton<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92073' \/><div class='watu-question-choice'><input type='radio' name='answer-23789[]' id='answer-id-92073' class='answer answer-20 js-answer-label answerof-23789' value='92073' \/>&nbsp;<label for='answer-id-92073' id='answer-label-92073' class='js-answer-label answer label-20'><span class='answer'>An ArrayIndexOutOfBoundsException is thrown at runtime.<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92074' \/><div class='watu-question-choice'><input type='radio' name='answer-23789[]' id='answer-id-92074' class='answer answer-20 js-answer-label answerof-23789' value='92074' \/>&nbsp;<label for='answer-id-92074' id='answer-label-92074' class='js-answer-label answer label-20'><span class='answer'>Compilation fails.<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Understanding the do-while Loop<br\/>* The do-while loopexecutes at least oncebefore checking the condition.<br\/>* The condition i++ &gt; 0 increments iafterchecking.<br\/>* Step-by-Step Execution<br\/>* Iteration 1:<br\/>* i = 0<br\/>* Prints: &#8220;Chanel&#8221;<br\/>* i++ updates i to 1<br\/>* Condition 1 &gt; 0is true, so the loop exits.<br\/>* Why Doesn&#8217;t the Loop Continue?<br\/>* Since i starts at 0, the conditioni++ &gt; 0 is false after the first iteration.<br\/>* The loopexits immediately after printing &#8220;Chanel&#8221;.<br\/>* Final Output<br\/>nginx<br\/>Chanel<br\/>Thus, the correct answer is:Chanel<br\/>References:<br\/>* Java SE 21 &#8211; do-while Loop<br\/>* Java SE 21 &#8211; Post-Increment Behavior<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(20,this)' id='btn-20' value='See Answer'  \/><input type='hidden' id='questionType20' value='radio' class=''><\/div><div class='watu-question' id='question-21'><div class='question-content'><p><strong>Q40.<\/strong> Given:<br \/>java<br \/>package com.vv;<br \/>import java.time.LocalDate;<br \/>public class FetchService {<br \/>public static void main(String[] args) throws Exception {<br \/>FetchService service = new FetchService();<br \/>String ack = service.fetch();<br \/>LocalDate date = service.fetch();<br \/>System.out.println(ack + &#8221; the &#8221; + date.toString());<br \/>}<br \/>public String fetch() {<br \/>return &#8220;ok&#8221;;<br \/>}<br \/>public LocalDate fetch() {<br \/>return LocalDate.now();<br \/>}<br \/>}<br \/>What will be the output?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23790' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92075' \/><div class='watu-question-choice'><input type='radio' name='answer-23790[]' id='answer-id-92075' class='answer answer-21 js-answer-label answerof-23790' value='92075' \/>&nbsp;<label for='answer-id-92075' id='answer-label-92075' class='js-answer-label answer label-21'><span class='answer'>ok the 2024-07-10T07:17:45.523939600<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92076' \/><div class='watu-question-choice'><input type='radio' name='answer-23790[]' id='answer-id-92076' class='answer answer-21 php-answer-label answerof-23790' value='92076' \/>&nbsp;<label for='answer-id-92076' id='answer-label-92076' class='php-answer-label answer label-21'><span class='answer'>Compilation fails<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92077' \/><div class='watu-question-choice'><input type='radio' name='answer-23790[]' id='answer-id-92077' class='answer answer-21 js-answer-label answerof-23790' value='92077' \/>&nbsp;<label for='answer-id-92077' id='answer-label-92077' class='js-answer-label answer label-21'><span class='answer'>An exception is thrown<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92078' \/><div class='watu-question-choice'><input type='radio' name='answer-23790[]' id='answer-id-92078' class='answer answer-21 js-answer-label answerof-23790' value='92078' \/>&nbsp;<label for='answer-id-92078' id='answer-label-92078' class='js-answer-label answer label-21'><span class='answer'>ok the 2024-07-10<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In Java, method overloading allows multiple methods with the same name to exist in a class, provided they have different parameter lists (i.e., different number or types of parameters). However, having two methods with the exact same parameter list and only differing in return type is not permitted.<br\/>In the provided code, the FetchService class contains two fetch methods:<br\/>* public String fetch()<br\/>* public LocalDate fetch()<br\/>Both methods have identical parameter lists (none) but differ in their return types (String and LocalDate, respectively). This leads to a compilation error because the Java compiler cannot distinguish between the two methods based solely on return type.<br\/>The Java Language Specification (JLS) states:<br\/>&#8220;It is a compile-time error to declare two methods with override-equivalent signatures in a class.&#8221; In this context, &#8220;override-equivalent&#8221; means that the methods have the same name and parameter types, regardless of their return types.<br\/>Therefore, the code will fail to compile due to the duplicate method signatures, and the correct answer is B:<br\/>Compilation fails.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(21,this)' id='btn-21' value='See Answer'  \/><input type='hidden' id='questionType21' value='radio' class=''><\/div><div class='watu-question' id='question-22'><div class='question-content'><p><strong>Q41.<\/strong> What do the following print?<br \/>java<br \/>import java.time.Duration;<br \/>public class DividedDuration {<br \/>public static void main(String[] args) {<br \/>var day = Duration.ofDays(2);<br \/>System.out.print(day.dividedBy(8));<br \/>}<br \/>}<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23791' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92079' \/><div class='watu-question-choice'><input type='radio' name='answer-23791[]' id='answer-id-92079' class='answer answer-22 php-answer-label answerof-23791' value='92079' \/>&nbsp;<label for='answer-id-92079' id='answer-label-92079' class='php-answer-label answer label-22'><span class='answer'>PT6H<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92080' \/><div class='watu-question-choice'><input type='radio' name='answer-23791[]' id='answer-id-92080' class='answer answer-22 js-answer-label answerof-23791' value='92080' \/>&nbsp;<label for='answer-id-92080' id='answer-label-92080' class='js-answer-label answer label-22'><span class='answer'>PT0H<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92081' \/><div class='watu-question-choice'><input type='radio' name='answer-23791[]' id='answer-id-92081' class='answer answer-22 js-answer-label answerof-23791' value='92081' \/>&nbsp;<label for='answer-id-92081' id='answer-label-92081' class='js-answer-label answer label-22'><span class='answer'>It throws an exception<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92082' \/><div class='watu-question-choice'><input type='radio' name='answer-23791[]' id='answer-id-92082' class='answer answer-22 js-answer-label answerof-23791' value='92082' \/>&nbsp;<label for='answer-id-92082' id='answer-label-92082' class='js-answer-label answer label-22'><span class='answer'>PT0D<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92083' \/><div class='watu-question-choice'><input type='radio' name='answer-23791[]' id='answer-id-92083' class='answer answer-22 js-answer-label answerof-23791' value='92083' \/>&nbsp;<label for='answer-id-92083' id='answer-label-92083' class='js-answer-label answer label-22'><span class='answer'>Compilation fails<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>In this code, a Duration object day is created representing a duration of 2 days using the Duration.ofDays(2) method. The dividedBy(long divisor) method is then called on this Duration object with the argument 8.<br\/>The dividedBy(long divisor) method returns a copy of the original Duration divided by the specified value. In this case, dividing 2 days by 8 results in a duration of 0.25 days. In the ISO-8601 duration format used by Java&#8217;s Duration class, this is represented as PT6H, which stands for a period of 6 hours.<br\/>Therefore, the output of the System.out.print statement is PT6H.<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(22,this)' id='btn-22' value='See Answer'  \/><input type='hidden' id='questionType22' value='radio' class=''><\/div><div class='watu-question' id='question-23'><div class='question-content'><p><strong>Q42.<\/strong> Given:<br \/>java<br \/>var deque = new ArrayDeque&lt;&gt;();<br \/>deque.add(1);<br \/>deque.add(2);<br \/>deque.add(3);<br \/>deque.add(4);<br \/>deque.add(5);<br \/>System.out.print(deque.peek() + &#8221; &#8220;);<br \/>System.out.print(deque.poll() + &#8221; &#8220;);<br \/>System.out.print(deque.pop() + &#8221; &#8220;);<br \/>System.out.print(deque.element() + &#8221; &#8220;);<br \/>What is printed?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23792' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92084' \/><div class='watu-question-choice'><input type='radio' name='answer-23792[]' id='answer-id-92084' class='answer answer-23 js-answer-label answerof-23792' value='92084' \/>&nbsp;<label for='answer-id-92084' id='answer-label-92084' class='js-answer-label answer label-23'><span class='answer'>1 1 1 1<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92085' \/><div class='watu-question-choice'><input type='radio' name='answer-23792[]' id='answer-id-92085' class='answer answer-23 js-answer-label answerof-23792' value='92085' \/>&nbsp;<label for='answer-id-92085' id='answer-label-92085' class='js-answer-label answer label-23'><span class='answer'>1 5 5 1<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92086' \/><div class='watu-question-choice'><input type='radio' name='answer-23792[]' id='answer-id-92086' class='answer answer-23 php-answer-label answerof-23792' value='92086' \/>&nbsp;<label for='answer-id-92086' id='answer-label-92086' class='php-answer-label answer label-23'><span class='answer'>1 1 2 3<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92087' \/><div class='watu-question-choice'><input type='radio' name='answer-23792[]' id='answer-id-92087' class='answer answer-23 js-answer-label answerof-23792' value='92087' \/>&nbsp;<label for='answer-id-92087' id='answer-label-92087' class='js-answer-label answer label-23'><span class='answer'>1 1 2 2<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92088' \/><div class='watu-question-choice'><input type='radio' name='answer-23792[]' id='answer-id-92088' class='answer answer-23 js-answer-label answerof-23792' value='92088' \/>&nbsp;<label for='answer-id-92088' id='answer-label-92088' class='js-answer-label answer label-23'><span class='answer'>5 5 2 3<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Understanding ArrayDeque Behavior<br\/>* ArrayDeque&lt;E&gt;is a double-ended queue (deque), working as aFIFO (queue) and LIFO (stack).<br\/>* Thedefault behaviorisqueue-like (FIFO)unless explicitly used as a stack.<br\/>* Step-by-Step Execution<br\/>java<br\/>var deque = new ArrayDeque&lt;&gt;();<br\/>deque.add(1);<br\/>deque.add(2);<br\/>deque.add(3);<br\/>deque.add(4);<br\/>deque.add(5);<br\/>* Deque after additions# [1, 2, 3, 4, 5]<br\/>* Operations Breakdown<br\/>* deque.peek()# Returns thehead(first element)without removal.<br\/>makefile<br\/>Output: 1<br\/>* deque.poll()# Removes and returns thehead.<br\/>go<br\/>Output: 1, Deque after poll # `[2, 3, 4, 5]`<br\/>* deque.pop()#Same as removeFirst(); removes and returns thehead.<br\/>perl<br\/>Output: 2, Deque after pop # `[3, 4, 5]`<br\/>* deque.element()# Returns thehead(same as peek(), but throws an exception if empty).<br\/>makefile<br\/>Output: 3<br\/>* Final Output<br\/>1 1 2 3<br\/>Thus, the correct answer is:1 1 2 3<br\/>References:<br\/>* Java SE 21 &#8211; ArrayDeque<br\/>* Java SE 21 &#8211; Queue Operations<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(23,this)' id='btn-23' value='See Answer'  \/><input type='hidden' id='questionType23' value='radio' class=''><\/div><div class='watu-question' id='question-24'><div class='question-content'><p><strong>Q43.<\/strong> Given:<br \/>java<br \/>List&lt;String&gt; frenchAuthors = new ArrayList&lt;&gt;();<br \/>frenchAuthors.add(&#8220;Victor Hugo&#8221;);<br \/>frenchAuthors.add(&#8220;Gustave Flaubert&#8221;);<br \/>Which compiles?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23793' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92089' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23793[]' id='answer-id-92089' class='answer answer-24 js-answer-label answerof-23793' value='92089' \/>&nbsp;<label for='answer-id-92089' id='answer-label-92089' class='js-answer-label answer label-24'><span class='answer'>Map&lt;String, ArrayList&lt;String&gt;&gt; authorsMap1 = new HashMap&lt;&gt;();<br \/>java<br \/>authorsMap1.put(&#8220;FR&#8221;, frenchAuthors);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92090' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23793[]' id='answer-id-92090' class='answer answer-24 js-answer-label answerof-23793' value='92090' \/>&nbsp;<label for='answer-id-92090' id='answer-label-92090' class='js-answer-label answer label-24'><span class='answer'>Map&lt;String, ? extends List&lt;String&gt;&gt; authorsMap2 = new HashMap&lt;String, ArrayList&lt;String&gt;&gt; (); java authorsMap2.put(&#8220;FR&#8221;, frenchAuthors);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92091' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23793[]' id='answer-id-92091' class='answer answer-24 php-answer-label answerof-23793' value='92091' \/>&nbsp;<label for='answer-id-92091' id='answer-label-92091' class='php-answer-label answer label-24'><span class='answer'>var authorsMap3 = new HashMap&lt;&gt;();<br \/>java<br \/>authorsMap3.put(&#8220;FR&#8221;, frenchAuthors);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92092' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23793[]' id='answer-id-92092' class='answer answer-24 php-answer-label answerof-23793' value='92092' \/>&nbsp;<label for='answer-id-92092' id='answer-label-92092' class='php-answer-label answer label-24'><span class='answer'>Map&lt;String, List&lt;String&gt;&gt; authorsMap4 = new HashMap&lt;String, ArrayList&lt;String&gt;&gt;(); java authorsMap4.put(&#8220;FR&#8221;, frenchAuthors);<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92093' \/><div class='watu-question-choice'><input type='checkbox' name='answer-23793[]' id='answer-id-92093' class='answer answer-24 php-answer-label answerof-23793' value='92093' \/>&nbsp;<label for='answer-id-92093' id='answer-label-92093' class='php-answer-label answer label-24'><span class='answer'>Map&lt;String, List&lt;String&gt;&gt; authorsMap5 = new HashMap&lt;String, List&lt;String&gt;&gt;(); java authorsMap5.put(&#8220;FR&#8221;, frenchAuthors);<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Option A (Map&lt;String, ArrayList&lt;String&gt;&gt; authorsMap1 = new HashMap&lt;&gt;();)<br\/>* #Compilation Fails<br\/>* frenchAuthors is declared as List&lt;String&gt;,notArrayList&lt;String&gt;.<br\/>* The correct way to declare a Map that allows storing List&lt;String&gt; is to use List&lt;String&gt; as the generic type,notArrayList&lt;String&gt;.<br\/>* Fix:<br\/>java<br\/>Map&lt;String, List&lt;String&gt;&gt; authorsMap1 = new HashMap&lt;&gt;();<br\/>authorsMap1.put(&#8220;FR&#8221;, frenchAuthors);<br\/>* Reason:The type ArrayList&lt;String&gt; is more specific than List&lt;String&gt;, and this would cause a type mismatcherror.<br\/>* Option B (Map&lt;String, ? extends List&lt;String&gt;&gt; authorsMap2 = new HashMap&lt;String, ArrayList&lt;String&gt;&gt;();)<br\/>* #Compilation Fails<br\/>* ? extends List&lt;String&gt;makes the map read-onlyfor adding new elements.<br\/>* The line authorsMap2.put(&#8220;FR&#8221;, frenchAuthors); causes acompilation errorbecause wildcard (?<br\/>extends List&lt;String&gt;) prevents modifying the map.<br\/>* Fix:Remove the wildcard:<br\/>java<br\/>Map&lt;String, List&lt;String&gt;&gt; authorsMap2 = new HashMap&lt;&gt;();<br\/>authorsMap2.put(&#8220;FR&#8221;, frenchAuthors);<br\/>* Option C (var authorsMap3 = new HashMap&lt;&gt;();)<br\/>* Compiles Successfully<br\/>* The var keyword allows the compiler to infer the type.<br\/>* However,the inferred type is HashMap&lt;Object, Object&gt;, which may cause issues when retrieving values.<br\/>* Option D (Map&lt;String, List&lt;String&gt;&gt; authorsMap4 = new HashMap&lt;String, ArrayList&lt;String&gt;<br\/>&gt;();)<br\/>* Compiles Successfully<br\/>* Valid declaration:HashMap&lt;K, V&gt; can be assigned to Map&lt;K, V&gt;.<br\/>* Using new HashMap&lt;String, ArrayList&lt;String&gt;&gt;() with Map&lt;String, List&lt;String&gt;&gt; isallowed due to polymorphism.<br\/>* Correct syntax:<br\/>java<br\/>Map&lt;String, List&lt;String&gt;&gt; authorsMap4 = new HashMap&lt;String, ArrayList&lt;String&gt;&gt;(); authorsMap4.put(&#8220;FR&#8221;, frenchAuthors);<br\/>* Option E (Map&lt;String, List&lt;String&gt;&gt; authorsMap5 = new HashMap&lt;String, List&lt;String&gt;&gt;();)<br\/>* Compiles Successfully<br\/>* HashMap&lt;String, List&lt;String&gt;&gt; isa valid instantiation.<br\/>* Correct usage:<br\/>java<br\/>Map&lt;String, List&lt;String&gt;&gt; authorsMap5 = new HashMap&lt;&gt;();<br\/>authorsMap5.put(&#8220;FR&#8221;, frenchAuthors);<br\/>Thus, the correct answers are:C, D, E<br\/>References:<br\/>* Java SE 21 &#8211; Generics and Type Inference<br\/>* Java SE 21 &#8211; var Keyword<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(24,this)' id='btn-24' value='See Answer'  \/><input type='hidden' id='questionType24' value='checkbox' class=''><\/div><div class='watu-question' id='question-25'><div class='question-content'><p><strong>Q44.<\/strong> Given:<br \/>java<br \/>String colors = &#8220;redn&#8221; +<br \/>&#8220;greenn&#8221; +<br \/>&#8220;bluen&#8221;;<br \/>Which text block can replace the above code?<\/p>\n<\/div><input type='hidden' name='question_id[]' value='23794' \/><div class='watu-questions-wrap '><input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92094' \/><div class='watu-question-choice'><input type='radio' name='answer-23794[]' id='answer-id-92094' class='answer answer-25 js-answer-label answerof-23794' value='92094' \/>&nbsp;<label for='answer-id-92094' id='answer-label-92094' class='js-answer-label answer label-25'><span class='answer'>java<br \/>String colors = &#8220;&#8221;&#8221;<br \/>red <br \/>green<br \/>blue <br \/>&#8220;&#8221;&#8221;;<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92095' \/><div class='watu-question-choice'><input type='radio' name='answer-23794[]' id='answer-id-92095' class='answer answer-25 js-answer-label answerof-23794' value='92095' \/>&nbsp;<label for='answer-id-92095' id='answer-label-92095' class='js-answer-label answer label-25'><span class='answer'>java<br \/>String colors = &#8220;&#8221;&#8221;<br \/>red s<br \/>greens<br \/>blue s<br \/>&#8220;&#8221;&#8221;;<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92096' \/><div class='watu-question-choice'><input type='radio' name='answer-23794[]' id='answer-id-92096' class='answer answer-25 js-answer-label answerof-23794' value='92096' \/>&nbsp;<label for='answer-id-92096' id='answer-label-92096' class='js-answer-label answer label-25'><span class='answer'>java<br \/>String colors = &#8220;&#8221;&#8221;<br \/>red t<br \/>greent<br \/>blue t<br \/>&#8220;&#8221;&#8221;;<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92097' \/><div class='watu-question-choice'><input type='radio' name='answer-23794[]' id='answer-id-92097' class='answer answer-25 php-answer-label answerof-23794' value='92097' \/>&nbsp;<label for='answer-id-92097' id='answer-label-92097' class='php-answer-label answer label-25'><span class='answer'>java<br \/>String colors = &#8220;&#8221;&#8221;<br \/>red<br \/>green<br \/>blue<br \/>&#8220;&#8221;&#8221;;<\/span><\/label><\/div>\n<input type='hidden' name='answer_ids[]' class='watu-answer-ids' value='92098' \/><div class='watu-question-choice'><input type='radio' name='answer-23794[]' id='answer-id-92098' class='answer answer-25 js-answer-label answerof-23794' value='92098' \/>&nbsp;<label for='answer-id-92098' id='answer-label-92098' class='js-answer-label answer label-25'><span class='answer'>None of the propositions<\/span><\/label><\/div>\n<\/div><div class='show-question-feedback' style='display:none;'>* Understanding Multi-line Strings in Java (&#8220;&#8221;&#8221; Text Blocks)<br\/>* Java 13 introducedtext blocks (&#8220;&#8221;&#8221;), allowing multi-line stringswithout needing explicit \\n for new lines.<br\/>* In a text block,each line is preserved as it appears in the source code.<br\/>* Analyzing the Options<br\/>* Option A: \\ (Backslash Continuation)<br\/>* The backslash (\\) at the end of a lineprevents a new line from being added, meaning:<br\/>nginx<br\/>red green blue<br\/>* Incorrect.<br\/>* Option B: \\s (Whitespace Escape)<br\/>* \\s represents asingle space,not a new line.<br\/>* The output would be:<br\/>nginx<br\/>red green blue<br\/>* Incorrect.<br\/>* Option C: \\t (Tab Escape)<br\/>* \\t inserts atab, not a new line.<br\/>* The output would be:<br\/>nginx<br\/>red green blue<br\/>* Incorrect.<br\/>* Option D: Correct Text Block<br\/>java<br\/>String colors = &#8220;&#8221;&#8221;<br\/>red<br\/>green<br\/>blue<br\/>&#8220;&#8221;&#8221;;<br\/>* Thispreserves the new lines, producing:<br\/>nginx<br\/>red<br\/>green<br\/>blue<br\/>* Correct.<br\/>Thus, the correct answer is:&#8221;String colors = &#8220;&#8221;&#8221; red green blue &#8220;&#8221;&#8221;.&#8221;<br\/>References:<br\/>* Java SE 21 &#8211; Text Blocks<br\/>* Java SE 21 &#8211; String Formatting<\/div><input type='button' class='showchecked' style='margin: 10px 0;' onclick='showanswer1(25,this)' id='btn-25' value='See Answer'  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