Final keyword in Java

It's used in variables, methods, and classes

1) Final variables - can't be reassigned the value
2) Final Method - Can't be override
3) Final Class - Can't be extends

1) Final Variable

public class FinalKeyTutorial { 

 final static int name = 2; 

 public static void main(String[] arg)
 {
  name = 3; //Compiler error  
  System.out.println(name);  
 }

}

2) Final Method

public class StaticKeyword {

 public static void main(String[] args) {  
  B b = new B();
  b.show();  
 }
}


class A { 
 final void show()
 {
  System.out.print("baseclasse");
 }
}

class B extends A {
 void show()
 {
  System.out.print("sub class");
 }

}

3) Final Class

The best example is String

public class FinalKeyTutorial {

 public static void main(String[] args) {
  FinalEx f =new FinalEx();
  f.a = 20;
 }
}

final class FinalEx{
  int a = 10;
}

Happy coding...😉