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Java-Abstract Class and Interface

12 posts

Implement Interface using Abstract Class in Java

Last Updated: 06 February 2023

Interface contains only abstract methods that can't be instantiated and it is declared by keyword interface. A class that is declared with the abstract keyword is known as...read more

Technical Scripter

Java-Abstract Class and Interface

java-interfaces

Technical Scripter 2020

Are All Methods in a Java Interface are Abstract?

Last Updated: 16 January 2023

In Java, the interface is called a blueprint of a class and it is used to achieve abstraction in java. By using interfaces only we can achieve multiple inheritances in jav...read more

Java-Abstract Class and Interface

java-interfaces

Constructor in Java Abstract Class

Last Updated: 02 November 2022

Constructor is always called by its class name in a class itself. A constructor is used to initialize an object not to build the object. As we all know abstract classes al...read more

Technical Scripter

Java-Constructors

Java-Abstract Class and Interface

Technical Scripter 2020

Can We Instantiate an Abstract Class in Java?

Last Updated: 10 October 2024

Abstract class, we have heard that abstract class are classes which can have abstract methods and it can't be instantiated. We cannot instantiate an abstract class in Java...read more

Java-Abstract Class and Interface

Why Java Interfaces Cannot Have Constructor But Abstract Classes Can Have?

Last Updated: 29 August 2021

Prerequisite: Interface and Abstract class in Java.A Constructor is a special member function used to initialize the newly created object. It is automatically called when ...read more

Computer Subject

Java-Abstract Class and Interface

java-interfaces

Difference between Abstract Class and Concrete Class in Java

Last Updated: 05 April 2022

Abstract Class: An abstract class is a type of class in Java that is declared by the abstract keyword. An abstract class cannot be instantiated directly, i.e. the object o...read more

Java-Object Oriented

Java-Abstract Class and Interface

Difference Between

Abstraction in Java

Last Updated: 14 April 2025

Abstraction in Java is the process of hiding the implementation details and only showing the essential details or features to the user. It allows to focus on what an objec...read more

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Java-Object Oriented

Java-Abstract Class and Interface

Java | Abstract Class and Interface | Question 3

Last Updated: 28 June 2021

Predict the output of the following program.[sourcecode language="Java"]abstract class demo{ public int a; demo() { a = 10; } abstract public void se...read more

Java-Abstract Class and Interface

Abstract Class and Interface

Difference Between Abstract Class and Interface in Java

Last Updated: 15 April 2025

In object-oriented programming (OOP), both abstract classes and interfaces serve as fundamental constructs for defining contracts. They establish a blueprint for other cla...read more

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Java-Abstract Class and Interface

Java | Abstract Class and Interface | Question 2

Last Updated: 22 April 2022

Which of the following is true about interfaces in java.1) An interface can contain following type of members.....public, static, final fields (i.e., constants) ....defaul...read more

Java-Abstract Class and Interface

Abstract Class and Interface

Java | Abstract Class and Interface | Question 1

Last Updated: 28 June 2021

Which of the following is FALSE about abstract classes in Java(A) If we derive an abstract class and do not implement all the abstract methods, then the derived class shou...read more

Java-Abstract Class and Interface

Abstract Class and Interface

Abstract Class in Java

Last Updated: 24 March 2025

In Java, abstract class is declared with the abstract keyword. It may have both abstract and non-abstract methods(methods with bodies). An abstract is a Java modifier appl...read more

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Java-Object Oriented

Java-Abstract Class and Interface