Interface example

 interface CallBack

{

void callback(int p );

}

class  Client implements CallBack

{

void Callback( int p)

{

System.out.println("this is client"+p);

}

}

class  Client1 implements CallBack

{

void Callback( int q)

{

System.out.println("this is client1"+q);

}

}

class Iface

{

public static void main(String ar[])

{

CallBack c=new Client();

CallBack c1=new Client1();

CallBack p;

p=c;

p.callback(10);

p=c1;

p.callback(20);

}

}