INTERFACE : JAVA Programming by "Gopal Krishna"

Program of Interface :

interface a

{

public void sum();

}

interface b

{

public void sub();

}

class xy implements a,b

{

public void sum()

{

System.out.println("i am sum");

}

public void sub()

{

System.out.println("i am sub");

}

}

abstract class xyz1 extends xy

{

abstract public void mul();

}

class xyz extends xyz1

{

public void mul()

{

System.out.println("i am mal");

}

}

class test

{

public static void main (String args[])

{

xyz x=new xyz();

x.sum();

x.sub();

x.mul();

}

}