example6_1.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

abstract class Animal{
	public abstract void cry();
}

class Dog extends Animal{
	public void cry(){
		System.out.println("汪汪...");
	}
}

class Cat extends Animal{
	public void cry(){
		System.out.println("咪咪...");
	}
}

class Example6_1{
	public static void main(String args[]){
		Animal a=new Dog();
		Animal b=new Cat();
		a.cry();
		b.cry();
	}
}