Final Keyword 

 final keyword is used for method, variables and classes

variable is constant

class does not inherit

if we create a final as a variable, it becomes constant, we cannot change the value of final.

if we create any final method, we cannot override it.

if we create a final class, it cannot extends it or inherit.

if we create a final as a variable, it becomes constant, we cannot change the value of final.

Example:

class Test
{
          public static void main(String[] args)
          {
                  final int i=10;
                   i=i+20;        // error cannot assign a value to final variable i
                   System.out.println(i);
          }
}

if we create any final method, we cannot override it.
Example:

class Test

{
     final void m1()
     {
      System.out.println(" I am in collage");
     }

}

class Demo extends Test
{
          void m1() //error m1 college cannot be override
          {
             System.out.println(" I am in home");
          }
           public static void main(String[] args)

                   {
            
                           
                         
                  }
}

if we create a final class, it cannot extends it or inherit.
Example:

final class Test
{
    void m1()
    {
      System.out.println(" I am in collage");
    }
}
class Demo extends Test
{
   void m1() //error m1 college cannot be override
   {
      System.out.println(" I am in home");
   }
    public static void main(String[] args)
   {

                      
                           
           
   }
}