Why Final Class used in Java?

The final keyword is used with a class to create a final class. The final class cannot be inherited and so the final keyword is commonly used with a class to prevent inheritance.

A program that demonstrates a final class in Java is given as follows:

Example

 Live Demo

final class A {    private int a = 9;    public void printA() {       System.out.println("Value of a = " + a);    } } public class Demo {    public static void main(String args[]) {       A obj = new A();       obj.printA();    } }

Output

Value of a = 9

Now let us understand the above program.

The class A is a final class. This means that it cannot be inherited. It has a private data member a and a method printA() that displays the value of a. A code snippet which demonstrates this is as follows:

final class A {    private int a = 9;    public void printA() {       System.out.println("Value of a = " + a);    } }

In the main() method in class Demo, an object obj of final class A is created. Then printA() method is called. A code snippet which demonstrates this is as follows:

public class Demo {    public static void main(String args[]) {       A obj = new A();       obj.printA();    } }