{"id":1680,"date":"2023-11-28T06:12:32","date_gmt":"2023-11-28T06:12:32","guid":{"rendered":"https:\/\/www.multiplechoicequestions.org\/?p=1680"},"modified":"2023-11-28T06:12:34","modified_gmt":"2023-11-28T06:12:34","slug":"java-wrapper-classes-mcq","status":"publish","type":"post","link":"https:\/\/www.multiplechoicequestions.org\/java-programming\/java-wrapper-classes-mcq\/","title":{"rendered":"Java Wrapper Classes MCQ"},"content":{"rendered":"\n<h2>1. What is the primary purpose of wrapper classes in Java?<\/h2>\n<div class=\"optioncontainer\">a) To provide a way to use primitive types as objects<\/div>\n<div class=\"optioncontainer\">b) To wrap text data<\/div>\n<div class=\"optioncontainer\">c) To encapsulate complex data structures<\/div>\n<div class=\"optioncontainer\">d) To improve performance of collections<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer1')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer1\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">a) To provide a way to use primitive types as objects<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Wrapper classes in Java provide a way to use primitive data types (int, char, etc.) as objects.\n<\/p>\n<\/div>\n\n<h2>2. Which of the following is a wrapper class for the primitive type &apos;int&apos;?<\/h2>\n<div class=\"optioncontainer\">a) Integer<\/div>\n<div class=\"optioncontainer\">b) Int<\/div>\n<div class=\"optioncontainer\">c) IntObject<\/div>\n<div class=\"optioncontainer\">d) IntWrapper<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer2')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer2\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">a) Integer<\/div>\n    <h3>Explanation:<\/h3>\n    <p> The Integer class is the wrapper class in Java for the primitive type &apos;int&apos;.\n<\/p>\n<\/div>\n\n<h2>3. How do you convert a primitive type to its corresponding wrapper object?<\/h2>\n<div class=\"optioncontainer\">a) Using wrapper constructors<\/div>\n<div class=\"optioncontainer\">b) Using static conversion methods<\/div>\n<div class=\"optioncontainer\">c) Directly assigning a primitive to a wrapper variable<\/div>\n<div class=\"optioncontainer\">d) All of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer3')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer3\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">d) All of the above<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Primitive types can be converted to wrapper objects using wrapper constructors, static conversion methods, or auto-boxing.\n<\/p>\n<\/div>\n\n<h2>4. What is auto-boxing in Java?<\/h2>\n<div class=\"optioncontainer\">a) Automatically wrapping a primitive type in its corresponding wrapper class<\/div>\n<div class=\"optioncontainer\">b) Boxing data into a collection<\/div>\n<div class=\"optioncontainer\">c) Converting objects to primitive types<\/div>\n<div class=\"optioncontainer\">d) A method of data encryption<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer4')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer4\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">a) Automatically wrapping a primitive type in its corresponding wrapper class<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Auto-boxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes.\n<\/p>\n<\/div>\n\n<h2>5. What is the wrapper class for the &apos;char&apos; primitive type?<\/h2>\n<div class=\"optioncontainer\">a) Char<\/div>\n<div class=\"optioncontainer\">b) Character<\/div>\n<div class=\"optioncontainer\">c) CharObject<\/div>\n<div class=\"optioncontainer\">d) CharSequence<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer5')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer5\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">b) Character<\/div>\n    <h3>Explanation:<\/h3>\n    <p> The Character class is the wrapper class for the primitive &apos;char&apos; type.\n<\/p>\n<\/div>\n\n<h2>6. What is unboxing in Java?<\/h2>\n<div class=\"optioncontainer\">a) Removing an object from a collection<\/div>\n<div class=\"optioncontainer\">b) Converting a wrapper object to its corresponding primitive type<\/div>\n<div class=\"optioncontainer\">c) Removing encryption from data<\/div>\n<div class=\"optioncontainer\">d) Unwrapping a string value<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer6')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer6\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">b) Converting a wrapper object to its corresponding primitive type<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Unboxing is the conversion of a wrapper object to its corresponding primitive type.\n<\/p>\n<\/div>\n\n<h2>7. How do you compare two wrapper objects for equality?<\/h2>\n<div class=\"optioncontainer\">a) Using the == operator<\/div>\n<div class=\"optioncontainer\">b) Using the equals() method<\/div>\n<div class=\"optioncontainer\">c) Both a and b<\/div>\n<div class=\"optioncontainer\">d) By converting them to primitive types first<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer7')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer7\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">b) Using the equals() method<\/div>\n    <h3>Explanation:<\/h3>\n    <p> To compare two wrapper objects for value equality, the equals() method should be used. The == operator compares object references.\n<\/p>\n<\/div>\n\n<h2>8. Which wrapper class is used for the &apos;boolean&apos; primitive type?<\/h2>\n<div class=\"optioncontainer\">a) Boolean<\/div>\n<div class=\"optioncontainer\">b) Bool<\/div>\n<div class=\"optioncontainer\">c) BooleanObject<\/div>\n<div class=\"optioncontainer\">d) BooleanWrapper<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer8')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer8\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">a) Boolean<\/div>\n    <h3>Explanation:<\/h3>\n    <p> The Boolean class is the wrapper class for the primitive type &apos;boolean&apos;.\n<\/p>\n<\/div>\n\n<h2>9. What happens when you assign a null value to a primitive type during unboxing?<\/h2>\n<div class=\"optioncontainer\">a) The primitive type takes a default value<\/div>\n<div class=\"optioncontainer\">b) A compile-time error occurs<\/div>\n<div class=\"optioncontainer\">c) A runtime exception is thrown<\/div>\n<div class=\"optioncontainer\">d) The primitive type becomes null<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer9')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer9\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">c) A runtime exception is thrown<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Assigning a null value to a primitive type during unboxing results in a NullPointerException.\n<\/p>\n<\/div>\n\n<h2>10. Which of the following is a valid way to instantiate a wrapper class object?<\/h2>\n<div class=\"optioncontainer\">a) Integer i = new Integer(5);<\/div>\n<div class=\"optioncontainer\">b) Integer i = Integer.valueOf(5);<\/div>\n<div class=\"optioncontainer\">c) Integer i = 5; \/\/ auto-boxing<\/div>\n<div class=\"optioncontainer\">d) All of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer10')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer10\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">d) All of the above<\/div>\n    <h3>Explanation:<\/h3>\n    <p> A wrapper class object can be instantiated using the constructor, static factory methods, or auto-boxing.\n<\/p>\n<\/div>\n\n<h2>11. How do you obtain the primitive value from a wrapper object?<\/h2>\n<div class=\"optioncontainer\">a) Using value methods like intValue(), charValue()<\/div>\n<div class=\"optioncontainer\">b) Using toString() method<\/div>\n<div class=\"optioncontainer\">c) By direct assignment to a primitive variable<\/div>\n<div class=\"optioncontainer\">d) Both a and c<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer11')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer11\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">d) Both a and c<\/div>\n    <h3>Explanation:<\/h3>\n    <p> The primitive value can be obtained from a wrapper object using value methods like intValue() or through unboxing by direct assignment.\n<\/p>\n<\/div>\n\n<h2>12. Can wrapper classes be used with collections in Java?<\/h2>\n<div class=\"optioncontainer\">a) Yes<\/div>\n<div class=\"optioncontainer\">b) No<\/div>\n<div class=\"optioncontainer\">c) Only certain collections<\/div>\n<div class=\"optioncontainer\">d) Only with additional libraries<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer12')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer12\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">a) Yes<\/div>\n    <h3>Explanation:<\/h3>\n    <p> Wrapper classes are used with collections in Java to store primitive types as objects.\n<\/p>\n<\/div>\n\n<h2>13. What is the output of comparing two Integer objects with the same value using the == operator?<\/h2>\n<div class=\"optioncontainer\">a) true<\/div>\n<div class=\"optioncontainer\">b) false<\/div>\n<div class=\"optioncontainer\">c) Depends on the values<\/div>\n<div class=\"optioncontainer\">d) Compilation error<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer13')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer13\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">b) false<\/div>\n    <h3>Explanation:<\/h3>\n    <p> The == operator compares references, not values, so it returns false unless both references point to the same object.\n<\/p>\n<\/div>\n\n<h2>14. Which of these is not a wrapper class in Java?<\/h2>\n<div class=\"optioncontainer\">a) Float<\/div>\n<div class=\"optioncontainer\">b) Short<\/div>\n<div class=\"optioncontainer\">c) String<\/div>\n<div class=\"optioncontainer\">d) Byte<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer14')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer14\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">c) String<\/div>\n    <h3>Explanation:<\/h3>\n    <p> String is not a wrapper class; it is a class for character strings. Float, Short, and Byte are all wrapper classes.\n<\/p>\n<\/div>\n\n<h2>15. What is the benefit of using wrapper classes in Java?<\/h2>\n<div class=\"optioncontainer\">a) Increased performance<\/div>\n<div class=\"optioncontainer\">b) Lower memory usage<\/div>\n<div class=\"optioncontainer\">c) Ability to use primitive types in generic collections<\/div>\n<div class=\"optioncontainer\">d) Automatic conversion to strings<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer15')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer15\">\n    <h3>Answer:<\/h3>\n    <div class=\"optioncontainer\">c) Ability to use primitive types in generic collections<\/div>\n    <h3>Explanation:<\/h3>\n    <p> One of the main benefits of wrapper classes is that they allow primitive types to be used in generic collections like ArrayList, where only objects can be stored.\n<\/p>\n<\/div>\n\n<script>\n   window.onload = function() {\ndocument.getElementById('answer1').style.display = 'none';\ndocument.getElementById('answer2').style.display = 'none';\ndocument.getElementById('answer3').style.display = 'none';\ndocument.getElementById('answer4').style.display = 'none';\ndocument.getElementById('answer5').style.display = 'none';\ndocument.getElementById('answer6').style.display = 'none';\ndocument.getElementById('answer7').style.display = 'none';\ndocument.getElementById('answer8').style.display = 'none';\ndocument.getElementById('answer9').style.display = 'none';\ndocument.getElementById('answer10').style.display = 'none';\ndocument.getElementById('answer11').style.display = 'none';\ndocument.getElementById('answer12').style.display = 'none';\ndocument.getElementById('answer13').style.display = 'none';\ndocument.getElementById('answer14').style.display = 'none';\ndocument.getElementById('answer15').style.display = 'none';\n   };\n\n   function toggleAnswer(answerId) {\n     var answer = document.getElementById(answerId);\n     if (answer.style.display === \"none\") {\n       answer.style.display = \"block\";\n     } else {\n       answer.style.display = \"none\";\n     }\n   }\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>1. What is the primary purpose of wrapper classes in Java? a) To provide a way to use primitive types as objects b) To wrap text data c) To encapsulate complex data structures d) To improve performance of collections Click to View Answer and Explanation Answer: a) To provide a way to use primitive types [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1680","post","type-post","status-publish","format-standard","hentry","category-java-programming"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java Wrapper Classes MCQ - Multiple Choice Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.multiplechoicequestions.org\/java-programming\/java-wrapper-classes-mcq\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java Wrapper Classes MCQ - Multiple Choice Questions\" \/>\n<meta property=\"og:description\" content=\"1. 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