package com.test;
//多态性public class test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stubAnimal an = new Cat();
an.cry();
an = new Dog();
an.cry();
}} class Animal { // private String name;// // private String color;// // private float weight;// public void cry() { System.out.println("我是动物,我不知道怎么叫!!"); } } class Cat extends Animal { public void cry() { System.out.println("我是猫,我的叫声是喵喵!!"); } } class Dog extends Animal { public void cry() { System.out.println("我是狗,我的叫声是汪汪!!"); } }