java认证考试编程题(20)
来源 :中华考试网 2016-10-06
中做一个饲养员给动物喂食物的例子体现JAVA中的面向对象思想,接口(抽象类)的用处
package com.softeem.demo;
/**
* @author leno
*动物的接口
*/
interface Animal
{
public void eat(Food food);
}
/**
* @author leno
*一种动物类:猫
*/
class Cat implements Animal
{
public void eat(Food food)
{
System.out.println("小猫吃"+food.getName());
}
}
/**
* @author leno
*一种动物类:狗
*/
class Dog implements Animal
{
public void eat(Food food)
{
System.out.println("小狗啃"+food.getName());
}
}
/**
* @author leno
*食物抽象类
*/
abstract class Food
{
protected String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
/**
* @author leno
*一种食物类:鱼
*/
class Fish extends Food
{
public Fish(String name) {
this.name = name;
}
}
/**
* @author leno
*一种食物类:骨头
*/
class Bone extends Food
{
public Bone(String name) {
this.name = name;
}
}
/**
* @author leno
* 饲养员类
*
*/
class Feeder
{
/**
* 饲养员给某种动物喂某种食物
* @param animal
* @param food
*/
public void feed(Animal animal,Food food)
{
animal.eat(food);
}
}
/**
* @author leno
*测试饲养员给动物喂食物
*/
public class TestFeeder {
public static void main(String[] args) {
Feeder feeder=new Feeder();
Animal animal=new Dog();
Food food=new Bone("肉骨头");
feeder.feed(animal,food); //给狗喂肉骨头
animal=new Cat();
food=new Fish("鱼");
feeder.feed(animal,food); //给猫喂鱼
}
}