{"id":2627,"date":"2024-05-07T07:17:19","date_gmt":"2024-05-07T07:17:19","guid":{"rendered":"https:\/\/www.hirist.tech\/blog\/?p=2627"},"modified":"2025-12-29T12:33:00","modified_gmt":"2025-12-29T12:33:00","slug":"top-15-inheritance-in-java-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/","title":{"rendered":"Top 15+ Inheritance in Java Interview Questions With Answers"},"content":{"rendered":"\n<p>Worried&nbsp;about potential inheritance questions in your Java interview? No need to stress! Because we have prepared this guide for your help.&nbsp;In Java programming, inheritance plays&nbsp;an important&nbsp;role in code structure and reusability.&nbsp;And, chances are, your interviewer will probe your knowledge on this topic.&nbsp;But are you ready to tackle those questions head-on?&nbsp;Our article covers the top 15+ common&nbsp;<strong>inheritance in Java interview questions<\/strong>, providing clear answers.&nbsp;<\/p>\n\n\n\n<p>Understanding these concepts will boost your confidence for any Java interview.&nbsp;<\/p>\n\n\n\n<p>Let&#8217;s begin!<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 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 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/#Basic_Inheritance_in_Java_Interview_Questions\" title=\"Basic Inheritance in Java Interview Questions\">Basic Inheritance in Java Interview Questions<\/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.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/#Advanced_Inheritance_Questions_in_Java\" title=\"Advanced Inheritance Questions in Java&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\">Advanced Inheritance Questions in Java&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/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.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/#Programming_Questions_on_Inheritance_in_Java\" title=\"Programming Questions on Inheritance in Java\">Programming Questions on Inheritance in 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.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/#Inheritance_Coding_Questions_in_Java\" title=\"Inheritance Coding Questions in Java\">Inheritance Coding Questions in Java<\/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.hirist.tech\/blog\/top-15-inheritance-in-java-interview-questions-with-answers\/#Wrapping_Up\" title=\"Wrapping Up\">Wrapping Up<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Basic_Inheritance_in_Java_Interview_Questions\"><\/span><strong>Basic Inheritance in Java Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some important&nbsp;<strong>inheritances in java interview questions<\/strong>&nbsp;and their answers for freshers.&nbsp;<\/p>\n\n\n\n<ol>\n<li><strong>What is inheritance in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p><a href=\"https:\/\/www.javatpoint.com\/inheritance-in-java\">Inheritance in Java<\/a>&nbsp;is a mechanism where a new class (subclass) can inherit properties and behaviour (methods) from an existing class (superclass).<\/p>\n\n\n\n<p>This&nbsp;makes it easier to reuse code and organize classes in a structured way. By using inheritance, developers can,<\/p>\n\n\n\n<ul>\n<li>Build upon existing code<\/li>\n\n\n\n<li>Extend functionality<\/li>\n\n\n\n<li>Create more specialized classes without duplicating code<\/li>\n<\/ul>\n\n\n\n<ol start=\"2\">\n<li><strong>What is the purpose of inheritance?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The&nbsp;main&nbsp;purpose of inheritance is code reuse. It allows classes to inherit commonly used attributes and methods from other classes, reducing redundancy and promoting a modular design.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>What are the types of inheritance in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>In Java, there are four&nbsp;types of inheritance:&nbsp;<\/p>\n\n\n\n<ul>\n<li>Single inheritance (one subclass inherits from one superclass)<\/li>\n\n\n\n<li>Multilevel inheritance (subclass extends another subclass)<\/li>\n\n\n\n<li>Hierarchical inheritance (multiple subclasses inherit from one superclass)<\/li>\n\n\n\n<li>Multiple inheritance (a subclass inherits from multiple superclasses)<\/li>\n<\/ul>\n\n\n\n<ol start=\"4\">\n<li><strong>Can a subclass override the methods of its superclass?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Yes, a subclass can override the methods of its superclass.&nbsp;This&nbsp;means it can provide its&nbsp;own&nbsp;implementation for a method inherited from the superclass.&nbsp;This&nbsp;is useful for customizing behaviour in the subclass.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>What is method overriding in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Method overriding&nbsp;in Java occurs when a subclass provides a specific implementation for a&nbsp;method&nbsp;that is&nbsp;already defined in its superclass. The method signature in the subclass must match the method signature in the superclass.<\/p>\n\n\n\n<ol start=\"6\">\n<li><strong>What is method overloading in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Method overloading&nbsp;in Java occurs when a class has multiple methods with the same name but different parameters. The compiler determines which method to call based on the number and types of arguments passed to it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advanced_Inheritance_Questions_in_Java\"><\/span><strong>Advanced Inheritance Questions in Java&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some advanced&nbsp;<strong>inheritance in Java interview questions<\/strong>&nbsp;and answers.<\/p>\n\n\n\n<ol start=\"7\">\n<li><strong>What is the &#8220;super&#8221; keyword used for in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The&nbsp;&#8220;super&#8221;&nbsp;keyword in Java refers to the superclass of the current object instance.&nbsp;It can be used to access superclass methods and constructors, as well as to&nbsp;call superclass constructors explicitly from a subclass constructor.<\/p>\n\n\n\n<ol start=\"8\">\n<li><strong>Can a subclass access private members of its superclass?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>No, a subclass cannot directly access the private members of its superclass. Private members are only accessible within the class they are declared in and cannot be inherited by subclasses<\/p>\n\n\n\n<ol start=\"9\">\n<li><strong>What is a constructor chaining in Java inheritance?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Constructor chaining&nbsp;in Java inheritance refers to&nbsp;the process of&nbsp;calling one constructor from another&nbsp;constructor&nbsp;in a superclass-subclass relationship.<\/p>\n\n\n\n<p>This&nbsp;allows the initialization of inherited members and ensures&nbsp;that all&nbsp;constructors in the inheritance hierarchy are&nbsp;properly&nbsp;invoked.<\/p>\n\n\n\n<ol start=\"10\">\n<li><strong>Can a subclass inherit from multiple superclasses in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>No,&nbsp;Java does not support multiple inheritance, where a subclass inherits from more than one superclass.&nbsp;This&nbsp;is to avoid the &#8220;diamond problem&#8221;, where ambiguity can arise if two superclasses have methods with the same signature.<\/p>\n\n\n\n<ol start=\"11\">\n<li><strong>What is the &#8220;final&#8221; keyword used in inheritance?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>In the context of inheritance, the&nbsp;&#8220;final&#8221;&nbsp;keyword in Java can&nbsp;be used to&nbsp;prevent a class from being subclassed.&nbsp;<\/p>\n\n\n\n<p>It can also be used to prevent methods from being overridden in subclasses, ensuring that the behaviour of a method remains consistent across the inheritance hierarchy.<\/p>\n\n\n\n<ol start=\"12\">\n<li><strong>What is the diamond problem in inheritance?&nbsp;<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The&nbsp;diamond problem&nbsp;in inheritance occurs when a class inherits from two classes&nbsp;that have&nbsp;a common ancestor.&nbsp;This&nbsp;creates ambiguity in method resolution.&nbsp;<\/p>\n\n\n\n<p>In Java, this is resolved using interface inheritance, where a class implements interfaces instead of inheriting multiple&nbsp;classes&nbsp;directly.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Programming_Questions_on_Inheritance_in_Java\"><\/span><strong>Programming Questions on Inheritance in Java<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>You might also come across&nbsp;<strong>programming questions on inheritance in Java<\/strong>. Here are some common ones that interviewers might ask.<\/p>\n\n\n\n<ol start=\"13\">\n<li><strong>How do you implement inheritance in Java code?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>In Java, inheritance is implemented using the &#8220;extends&#8221; keyword to create a subclass that inherits from a superclass.&nbsp;<\/p>\n\n\n\n<p><strong>For example:<\/strong>&nbsp;<\/p>\n\n\n\n<p>class Subclass extends Superclass {&#8230;}.<\/p>\n\n\n\n<ol start=\"14\">\n<li><strong>How do you prevent a method from being overridden in Java?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>You can prevent a method from being overridden by using the &#8220;final&#8221; keyword in the method signature in the superclass.&nbsp;<\/p>\n\n\n\n<p><strong>For example:<\/strong>&nbsp;<\/p>\n\n\n\n<p>final void methodName() {&#8230;}.<\/p>\n\n\n\n<ol start=\"15\">\n<li><strong>Can a subclass access protected members of its superclass in a different package?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Yes, a subclass in a different package can access protected members of its superclass. Protected members are accessible to subclasses within the same package and&nbsp;to&nbsp;subclasses in different packages.<\/p>\n\n\n\n<ol start=\"16\">\n<li><strong>Write a Java program to demonstrate constructor chaining in inheritance.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>class Superclass {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;private int x;<\/p>\n\n\n\n<p>Superclass(int arg) {<\/p>\n\n\n\n<p>this.x = arg;<\/p>\n\n\n\n<p>System.out.println(&#8220;Superclass constructor&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>class Subclass extends Superclass {<\/p>\n\n\n\n<p>&nbsp;&nbsp;private int y;&nbsp;<\/p>\n\n\n\n<p>Subclass(int arg1, int arg2) {<\/p>\n\n\n\n<p>super(arg1);<\/p>\n\n\n\n<p>this.y = arg2;<\/p>\n\n\n\n<p>System.out.println(&#8220;Subclass constructor&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public static void main(String[] args) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subclass obj = new Subclass();<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/ Output:<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/ Superclass constructor<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/ Subclass constructor<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inheritance_Coding_Questions_in_Java\"><\/span><strong>Inheritance Coding Questions in Java<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some important coding-related&nbsp;<strong>inheritance in java interview questions<\/strong>&nbsp;and their answers.&nbsp;<\/p>\n\n\n\n<ol start=\"17\">\n<li><strong>Write a Java program to demonstrate single inheritance.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>class Parent {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;void display() {<\/p>\n\n\n\n<p>System.out.println(&#8220;Parent class method&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>class Child extends Parent {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public static void main(String[] args) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Child obj = new Child();<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;obj.display(); \/\/ Output: Parent class method<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<ol start=\"18\">\n<li><strong>Implement multiple inheritance in Java using interfaces.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>interface Interface1 {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;void method1();<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>interface Interface2 {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;void method2();<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>class MyClass implements Interface1, Interface2 {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public void method1() {<\/p>\n\n\n\n<p>System.out.println(&#8220;Method1 implementation&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public void method2() {<\/p>\n\n\n\n<p>System.out.println(&#8220;Method2 implementation&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public static void main(String[] args) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MyClass obj = new MyClass();<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;obj.method1(); \/\/ Output: Method1 implementation<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;obj.method2(); \/\/ Output: Method2 implementation<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<ol start=\"19\">\n<li><strong>Explain the method hiding in Java inheritance with an example.<\/strong><\/li>\n<\/ol>\n\n\n\n<p><a href=\"https:\/\/www.javatpoint.com\/method-hiding-in-java#:~:text=Method%20hiding%20can%20be%20defined,are%20resolved%20at%20compile%20time.\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Method hiding<\/a>&nbsp;occurs when a subclass defines a static method with the same name and signature as a static method in the superclass.<\/p>\n\n\n\n<p><strong>For example:<\/strong><\/p>\n\n\n\n<p>class Parent {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;static void display() {<\/p>\n\n\n\n<p>System.out.println(&#8220;Parent class method&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>class Child extends Parent {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;static void display() {<\/p>\n\n\n\n<p>System.out.println(&#8220;Child class method&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;public static void main(String[] args) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parent.display(); \/\/ Output: Parent class method<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Child.display();&nbsp;\/\/ Output: Child class method<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.com\/blog\/top-25-interview-questions-on-string-in-java-with-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 25+ Interview Questions On String in Java with Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wrapping_Up\"><\/span><strong>Wrapping Up<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>And that&#8217;s a wrap!&nbsp;<\/p>\n\n\n\n<p>These are the 15+&nbsp;important&nbsp;<strong>inheritance in Java interview questions<\/strong>, along with their answers. Understanding these concepts is&nbsp;key&nbsp;to acing your Java interviews.&nbsp;Ready to kickstart your career in Java development? Visit&nbsp;<a href=\"https:\/\/www.hirist.tech\/\">Hirist<\/a>&nbsp;to find the best tech job opportunities. Connect with&nbsp;more than&nbsp;50,000 recruiters, filter job listings and land your dream job with Hirist.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Worried&nbsp;about potential inheritance questions in your Java interview? No need to stress! Because we have&hellip;<\/p>\n","protected":false},"author":1,"featured_media":2634,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,29,19],"tags":[32,34,33],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 15+ Inheritance in Java Interview Questions (2026) | Hirist<\/title>\n<meta name=\"description\" content=\"Here are the top 15+ commonly asked inheritance in Java interview questions and answers. 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