How to use final keyword in java

Final keyword:-If we use final before class then we cannot extend the class.

We cannot reuse the method by using final keyword.

class Test{

final void show()

{

System.out.println("Hello Friends");

}

}

class Main extends Test{

void show();

public static void main(String args[]){

final int x=10;

System.out.println("Before swapping :- "+x);

int y=20;

x=y;

System.out.println("After swapping :- "+x);

}

}

OUTPUT:-

Compile Time Error