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