4 C. Write a java program to demonstrate the implementation of abstract class.

 Program :

public abstract class Calc 

{

 public abstract int sqr(int n1);

 public abstract int cube(int n1);

 public void show()

 {

 System.out.println("Hello");

 }

}

public class Prac4c extends Calc

{

 @Override

 public int sqr(int n1) 

{

 return n1*n1;

 }

 @Override

 public int cube(int n1) 

{

 return n1*n1*n1; 

 }

 public static void main(String[] args) 

{

 Prac4c obj=new Prac4c();

 int a= obj.sqr(4);

 System.out.println("4's Square= "+a);

 int b= obj.cube(4);

 System.out.println("4's Cube= "+b);

 }    // end of main method

}    //end class