Java 面向对象 之 多态实例 孩子吃水果

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/** 题目: 孩子吃(苹果,葡萄,芒果) 思路： 1. 抽象出类 : 孩子(Baby), 苹果(Apple),葡萄(Grape) 2. 找出类的关系: 苹果,葡萄 -> 孩子 3. 找出属性: 孩子(姓名,苹果引用,葡萄引用) 苹果(名称) 葡萄(名称) 4. 找出方法: 孩子吃(eat)苹果或者葡萄 */ public class Polymorphism2 { public static void main(String[] args) { //实例化一个Baby Baby baby = new Baby("李明"); //实例化一个苹果 和 一个葡萄 Apple apple = new Apple("红富士"); Grape grape = new Grape("黑葡萄"); Mango mango = new Mango("大芒果"); //李明吃苹果和葡萄 baby.eat(apple); System.out.println(baby.getName() + " 高兴的说我吃了 " + baby.getApple().getName()); baby.eat(grape); System.out.println(baby.getName() + " 高兴的说我吃了 " + baby.getGrape().getName()); baby.eat(mango); System.out.println(baby.getName() + " 高兴的说我吃了 " + baby.getMango().getName()); } } class Baby { private Apple apple; private Grape grape; private Mango mango; private String name; public Baby(String name) { this.name = name; } public String getName() { return this.name; } public Apple getApple() { return this.apple; } public Grape getGrape() { return this.grape; } public Mango getMango() { return this.mango; } //吃苹果 public void eat(Apple apple) { this.apple = apple; } //吃葡萄 public void eat(Grape grape) { this.grape = grape; } //吃芒果 public void eat(Mango mango) { this.mango = mango; } } class Apple { private String name; public Apple(String name) { this.name = name; } public String getName() { return this.name; } } class Grape { private String name; public Grape(String name) { this.name = name; } public String getName() { return this.name; } } class Mango { private String name; public Mango(String name) { this.name = name; } public String getName() { return this.name; } } 

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