Java 面向对象 之 多态实例1

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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;
    }

}

http://www.verejava.com/?id=16992843565554