#1188: Bonding explain

class Ball extends Throwable {}

class P{

 P target;

 P(P target) {

     this.target = target;

 }

 void aim (Ball ball) {

     try {

         throw ball;

     }

     catch (Ball b) {

         target.aim(b);

     }

 }

 public static void main(String[] args) {

     P parent = new P(null);

     P child = new P(parent);

     parent.target = child;

     parent.aim(new Ball());

 }

}