INHERITANCE sample java program

/* **********INHERITANCE *********************/



class GrandFather
{
      int c;
        void gfathermethod()
          {
        System.out.println("I am a method of GrandFather");
        }
    }


class Father extends GrandFather
{
      int a;
        void fathermethod()
          {
      System.out.println("I am a method of Father");
        }
    }

class Son extends Father
    {
int b;
      void sonmethod()
        {
      System.out.println("I am a method of Son");
        }
    }



class simpleinheritance
  {
public static void main(String args[])
      {
      GrandFather grand=new GrandFather();
grand.c=100;
grand.gfathermethod();

Father father = new Father();
      Son son  = new Son();

      father.a=10;
father.c=200;
                     father.fathermethod();
    System.out.println("father.a = " + father.a);
System.out.println("father.a = " + father.c);
   
      son.a=20;
      son.b =30;
son.c=300;
    System.out.println("son.a =  " + son.a + "   son.b = " + son.b+"son.c = " +son.c);
      son.fathermethod();
      son.sonmethod();
son.gfathermethod();
    }
  }