{"id":85,"date":"2024-09-02T12:12:38","date_gmt":"2024-09-02T12:12:38","guid":{"rendered":"https:\/\/itvedant.com\/blog\/?p=85"},"modified":"2025-06-27T14:35:02","modified_gmt":"2025-06-27T09:05:02","slug":"top-10-java-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/","title":{"rendered":"Top 10 Java Interview Questions and Answers"},"content":{"rendered":"\n<p>Java is one of the most influential programming languages ever used for the longest time since several decades. It was developed by James Gosling in the year 1990s. And since then, the world has witnessed 12 distinguishable updated versions of Java. Java has become most in demand in the programming language. It has a large and active developer community, extensive libraries and frameworks, and widespread adoption in various industries. Java has gained a lot of popularity over the years with opening <a href=\"https:\/\/www.itvedant.com\/careers\">career opportunities<\/a> in the same field, leading to a lot of people trying to learn and embark on their professional programming journey through <a href=\"https:\/\/www.itvedant.com\/full-stack-developer\">Java Certification.<\/a><\/p>\n\n\n\n<p>In this blog, we will be talking about Java interview questions and answers which will be helpful and very insightful for you while you prepare for your dream job, which is useful for both freshers and experienced. Let\u2019s get you prepped up so that you can brush up on your concepts and excel in your interview. But before we proceed, don\u2019t forget to bookmark this article so that you can keep it in hand before your interview and avoid the panic-filled situation one faces before their interview. Without any further ado let\u2019s begin.<\/p>\n\n\n\n<p><br>Here is a compiled list of the Top 10 Java Interview questions with answers which will you stand out in that interview you have been trying your best.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_68_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#1_What_is_Java\" title=\"1. What is Java?\">1. What is Java?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#2_Why_is_Java_said_to_be_an_object-oriented_Language\" title=\"2. Why is Java said to be an object-oriented Language?\">2. Why is Java said to be an object-oriented Language?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#3_Mention_a_few_differences_between_C_and_Java\" title=\"3. Mention a few differences between C++ and Java.\">3. Mention a few differences between C++ and Java.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#4_Can_you_share_what_is_JVM\" title=\"4. Can you share what is JVM?\">4. Can you share what is JVM?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#5_What_is_an_online_Java_Compiler\" title=\"5. What is an online Java Compiler?\">5. What is an online Java Compiler?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#6_Can_you_explain_what_is_JDK\" title=\"6. Can you explain what is JDK?\">6. Can you explain what is JDK?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#7_What_is_the_difference_between_ArrayList_and_LinkedList\" title=\"7. What is the difference between ArrayList and LinkedList?\">7. What is the difference between ArrayList and LinkedList?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#8_What_is_Type_Casting\" title=\"8. What is Type Casting?\">8. What is Type Casting?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#9_What_is_Abstraction\" title=\"9. What is Abstraction?\">9. What is Abstraction?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#10_What_is_Encapsulation\" title=\"10. What is Encapsulation?\">10. What is Encapsulation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.itvedant.com\/blog\/top-10-java-interview-questions-and-answers\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_What_is_Java\"><\/span>1. What is Java?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Java is a popular and multi-programming language that allows developers to create software applications that can run on various devices and platforms. The rules and syntax of Java are highly based on C++ and C languages. In simple words, Java is a tool or language that developers use to give instructions to computers. One of the greatest key features of Java is that it works on the \u201cwrite once, run anywhere\u201d feature. If a program is written once in a notebook computer, you can easily change its portability on a mobile device.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Why_is_Java_said_to_be_an_object-oriented_Language\"><\/span>2. Why is Java said to be an object-oriented Language?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Java is considered to be an object-oriented language since it adheres to all the principles of encapsulation, inheritance, polymorphism, and abstraction, which are very often referred to as the SOLID Principles of OOPs. Object-oriented programming paradigms revolve around the concept of \u201cobjects\u201d, which are instances of classes.<\/p>\n\n\n\n<p>These concepts of an object-oriented programming language often contain data and code that is associated with the functions it is linked with.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Mention_a_few_differences_between_C_and_Java\"><\/span>3. Mention a few differences between C++ and Java.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C++ is a language that supports procedural, object-oriented, and generic programming. C++ program language runs on the feature of \u201cwrite once, compile everywhere\u201d and works on manual memory management. Where Java is an object-oriented language. It is highly influenced by C++ and C programming languages, with additional features and stricter rules. Java does automatic memory management with the help of garbage collection.<\/p>\n\n\n\n<p>C++ is a programming language which has a standard library, which is said to be relatively smaller than the library of Java.<\/p>\n\n\n\n<p>Java has a large and comprehensively bigger library, it consists of open networks, I.O Operations, and network bases. It has a vast eco-system consisting of third-party libraries and frameworks.<\/p>\n\n\n\n<p>C++ uses exceptions of error handling, developers manually handle the errors by using \u201ctry-catch\u201d blocks.Java enforces mandatory exception handling. Exceptions are explicitly declared in the method signature using the \u201cthrows\u201d keyword or caught within \u201ctry-catch\u201d blocks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Can_you_share_what_is_JVM\"><\/span>4. Can you share what is JVM?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>JVM stands for Java Virtual Management. It is an important component of the Java Platform, which is an essential part of the Java program. The JVM acts as an interpreter between the environment and the Java bytecode.<\/p>\n\n\n\n<p>When a Java program is compiled, it is converted into byte code as a platform-independent representation of the program.<\/p>\n\n\n\n<p>Its infrastructure technically comprises of Classloader, bytecode execution, Just-in-time compilation (JIT), Memory management, and platform independence.<\/p>\n\n\n\n<p>JVM is known for providing cross-platform compatibility and runtime performance for which Java is very known.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_What_is_an_online_Java_Compiler\"><\/span>5. What is an online Java Compiler?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>An online Java compiler is a web-based tool, which helps developers to write, compile, and execute code without having to install a Java development application. It provides an interactive coding environment for the developers, to experiment, develop code and learn the language.<\/p>\n\n\n\n<p>Online Java compiler includes features such as code editor, compilation, execution, error reporting, shareability, and integration of the learning resources.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Can_you_explain_what_is_JDK\"><\/span>6. Can you explain what is JDK?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>JDK stands for Java Development Kit. The <a href=\"https:\/\/www.itvedant.com\/\">software development <\/a>kit is provided by Oracle Corporation for developing Java applications. The JDK includes the necessary tools to compile, execute, develop, and run Java programs.<\/p>\n\n\n\n<p>The few key components of the JDK are Java Compiler, Java Runtime Environment (JRE), Development tools, Libraries and APIs, Documentation, and Examples.<\/p>\n\n\n\n<p>It includes JRE and additional tools for development purposes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_What_is_the_difference_between_ArrayList_and_LinkedList\"><\/span>7. What is the difference between ArrayList and LinkedList?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>ArrayList<\/strong><\/td><td><strong>LinkedList<\/strong><\/td><\/tr><tr><td>ArrayList internally uses a dynamic array to store elements.<\/td><td>LinkedList uses a doubly linked data structure list to store elements.<\/td><\/tr><tr><td>ArrayList automatically grows its size when new elements are added by creating a new, larger array and copying the elements.<\/td><td>Insertions and deletions can be performed efficiently by adjusting the references of adjacent nodes.<\/td><\/tr><tr><td>Array list is faster for sequential access and iterating over elements, as the elements are stored contiguously in memory.<\/td><td>LinkedList takes its overhead time as the elements are transferred between the nodes.<\/td><\/tr><tr><td>ArrayList consumes more memory as it needs to allocate memory in the underlying array.<\/td><td>LinkedList consumes less memory than ArrayList as the memory is used only for the element and its references.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8_What_is_Type_Casting\"><\/span>8. What is Type Casting?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In simple words, firstly, let&#8217;s break down the meaning of the word Type Casting. Here, type refers to the type of data such as a variable, or an entity and casting means the transfer of data from one variable to another. Type casting is the process of converting a variable type from one to another, either by narrowing or widening the set of use values.<\/p>\n\n\n\n<p>Typecasting is extremely useful when you need to transfer the value of one variable to another or when you are looking to assign a value to a particular variable or when you want to undertake operations on another value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"9_What_is_Abstraction\"><\/span>9. What is Abstraction?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Java&#8217;s abstraction feature enables you to represent an object or system simply by hiding its intricate implementation details and just exposing the necessary features and behaviors to the outside world. Abstraction is a key notion in object-oriented programming. It helps you to concentrate on an object&#8217;s function rather than its mechanism.<\/p>\n\n\n\n<p>Abstraction in Java is the act of representing the features without showing in detail the integrity or the explanations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"10_What_is_Encapsulation\"><\/span>10. What is Encapsulation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Encapsulation refers to the technique of hiding the details and properties of the variable. It is in short considered to be the deliverable of abstraction. It operates on the data in a single unit known as a class. It restricts data from outside the class and provides controlled access through methods, ensuring data integrity and hiding implementation details.<\/p>\n\n\n\n<p>It prevents any other data outside the unit to interfere, alter or access the properties or methods encapsulated object.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>Here will be ending our Top 10 Java interview questions and answers. I hope you found this blog to the most of your benefit. But if you are intrigued enough to learn better about Java in detail and want to upgrade your career development, you can enroll in Itvedant\u2019s IT courses which have proved to be a leading <a href=\"https:\/\/www.itvedant.com\/\">IT Training Institute <\/a>and have been catering to many dreams. Thank you for your patient reading and sticking to the end. I will be waiting for you with the same enthusiasm at the beginning of my next blog. Wishing you all the very best for your interview.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java is one of the most influential programming languages ever used for the longest time since several decades. It was [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":86,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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":[11],"tags":[],"class_list":["post-85","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Java is one of the most influential programming languages ever used for the longest time since several decades. 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