JAVA面向对象练习05第三种

食物类，动物类，饲养员类，测试类。实现饲养员给动物喂食物。
食物类： 属性name
动物类： 属性name 方法void eat
饲养员类： 属性name 方法void feed
测试类打印的结果：
张三喂大熊猫
大熊猫吃竹笋
package demo03;

public class Animal {

public String name;public Food f;public void eat(){    System.out.println(name+"吃"+f.name);}

}

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package demo03;

public class Feeder {

public String name;public Animal a;public void feed(){    System.out.println(name+"喂"+a.name);}

}

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package demo03;

public class Food {

public String name;

}

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package demo03;

public class Test {

public static void main(String[] args) {    Food f = new Food();    f.name = "竹笋";    Animal a = new Animal();    a.name = "大熊猫";    a.f = f;    Feeder fer = new Feeder();    fer.name = "张三";    fer.a = a;    fer.feed();    a.eat();}

}