What Is Purpose Of Abstract Class In Java

Before learning the java abstract class lets understand the abstraction in java first. Abstraction can be achieved with either abstract classes or interfaces which you will learn more about in the next chapter. The abstract class holds set of functionality common among the sub classes.
what is purpose of abstract class in java

2 like c an abstract class can contain constructors in java.

What is purpose of abstract class in java. The purpose of an abstract class is to function as a base for subclasses. A java abstract class is a class which cannot be instantiated meaning you cannot create new instances of an abstract class. Abstract class in java is a class declared with abstract keyword. Abstract class is used when there is a requirement where we need to share some common operations that are required in every subclass.

A class that extends from abstract class must provide implementation body for the abstract methods. The abstract keyword is a non access modifier used for classes and methods. Java abstract classes and methods data abstraction is the process of hiding certain details and showing only essential information to the user. Abstract class in java a class which is declared with the abstract keyword is known as an abstract class in java.

The purpose of an abstract class is to function as a base for subclasses. It has set of abstract methods and concreteimplemented methods. It can have abstract and non abstract methods method with the body. An abstract method in java is a method that does not have implementation no body and it is also declared with abstract keyword.

For example the following is a valid java program. And a constructor of abstract class is called when an instance of a inherited class is created. Abstract class contains one or more abstract methods.