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// Demonstrate dynamic method dispatch.

class Sup {

void who() {

System.out.println("Who() in Sup");

}

}

class Sub1 extends Sup {

void who() {

System.out.println("Who() in Sub1");

}

}

class Sub2 extends Sup {

void who() {

System.out.println("Who () in Sub2");

}

}

public class Dynamic_Dispatch_Demo {

public static void main(String[] args) {

// TODO Auto-generated method stub

Sup superOb = new Sup();

Sub1 subOb1 = new Sub1();

Sub2 subOb2 = new Sub2();

Sup supRef; // Declaring a variable called supRef of the class type Sup. This variable does not define an object. Instead, it is simply a variable that can refer to an object.

supRef = superOb;

supRef.who(); // In each case, the version of who() to call is determined at run time by ...

supRef = subOb1;

supRef.who(); // ... the type of object being referred to.

supRef = subOb2;

supRef.who();

}

}