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- What is Inheritance in Java? Ans: The technique of creating a new class by using an existing class functionality is called inheritance in Java. In other words, inheritance is a process where a child class acquires all the properties and behaviors of the parent class.
- Why do we need to use inheritance? Or, What is the purpose of using inheritance? Ans: Inheritance is one of the main pillars of OOPs concept. Some objects share certain properties and behaviors.
- What is Is-A relationship in Java? Ans: Is-A relationship represents Inheritance. It is implemented using the “extends” keyword. It is used for code reusability.
- What is super class and subclass? Ans: A class from where a subclass inherits features is called superclass. It is also called base class or parent class.
May 1, 2024 · Prepare these Oracle Java developer job interview questions for freshers to answer questions confidently. You can also pursue a core Java course to understand all the key concepts and gain an industry-recognized and government-approved certification in Java.
May 7, 2024 · Our article covers the top 15+ common inheritance in Java interview questions, providing clear answers. Understanding these concepts will boost your confidence for any Java interview. Let’s begin!
- Q1. What Is Inheritance in Java?
- Q2. How Many Types of Inheritance Are Supported by Java?
- Q3. What Is The Difference Between Abstract Class and Interface?
- Q4. Can An Abstract Class Be instantiated? If Not, Why?
- Q5. What Is The Purpose of The "Super" Keyword in Java?
A1. Inheritance in Java is a mechanism where one class (child or subclass) acquires the properties and behaviours of another class (parent or superclass). This allows for the reuse of code and creates a hierarchical relationship between classes.
A2. Java supports five types of inheritance: single, multi-level, hierarchical, multiple, and hybrid. Single inheritance is where a subclass extends a single superclass, while multi-level inheritance is where a subclass extends a superclass, which in turn extends another superclass. Hierarchical inheritance is where multiple subclasses extend a sin...
A3. An abstract class is a class that cannot be instantiated and may contain both abstract and non-abstract methods. An interface, on the other hand, is a collection of abstract methods and constants that can be implemented by any class. An interface cannot contain any implementation code, while an abstract class can contain some implementation cod...
A4. No, an abstract class cannot be instantiated because it is an incomplete class. It contains one or more abstract methods that are not implemented in the abstract class, and thus it cannot be fully instantiated. However, a subclass that extends the abstract class can be instantiated.
A5. The "super" keyword in Java is used to refer to the parent class. It is used to call the constructor or method of the parent class, access the parent class's variables or methods, and differentiate between a parent class's method and a child class's method with the same name. The "super" keyword can also be used to invoke a parent class's const...
Jun 12, 2024 · Let's discuss the top java inheritance interview questions with their detailed solutions. Want to know about the Fibonacci Series in Java in detail. Java Inheritance Interview Questions and Answers 1. What does Java's inheritance mean?
Mar 1, 2024 · Master Java inheritance for your next interview. Essential tips and examples to understand code reuse and class hierarchies in Java.
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Sep 12, 2023 · We present an extensive list of interview questions that explore various aspects of inheritance, such as single, multiple, multilevel, hierarchical, and hybrid inheritance, along with other related concepts like method overriding and polymorphism.
