Abstract Class

Implement Super
Class as abstract and define two abstract method in it and implement multilevel
inheritance.

Program:

abstract class A

 {

  int i=10;

  abstract
void cal( );

  abstract
void Display( ); 

 }

abstract class B extends A

{

  void
Display()

    {

    
System.out.println( +i);

    }

}

 class C
extends B

{

  void cal( )

     {

       
i=i+10;

     }

}

class Sk22

 {

  public
static void main(String args[])

   {

    C obj=new
C();

   
obj.Display();

    obj.cal();

   
obj.Display();

    }

 }

Compile:

D:\>javac
Sk22.java

Run:

D:\>java Sk22

Output:

10

20