dyndispdemo.java

Java 程序设计源码 只提供了部分

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 DynDispDemo {
	public static void main(String[] args) {
		Sup supOb = new Sup();
		Sub1 sub1Ob = new Sub1();
		Sub2 sub2Ob = new Sub2();

		Sup supOb2;

		supOb2 = supOb;
		supOb2.who();

		supOb2 = sub1Ob;
		supOb2.who();

		supOb2 = sub2Ob;
		supOb2.who();
				
	}
}