一个微波炉，叫你设计，需要用到什么设计模式？

最近学习+复习各种常用设计模式，看到一道题目http://www.iteye.com/topic/243309和http://topic.csdn.net/u/20091125/14/99c028d1-6cf0-4f82-b852-b94b84c4fb45.html，很有意思，不看不知道，面向对象真奇妙！

 

其他人怎么说，不如自己练，于是用了单例模式，策略模式和命令模式写了一个初版的微波炉，考虑了微波炉操作的时候不能开门。策略模式用于烹饪鱼和鸡等一套【高级】微波炉功能，命令模式用于“煮”，“煎”，“高火”，“中火”，“低火”等【基础】功能。

 

测试类CookFishTest：

 

package com.hui.test;

import java.util.ArrayList;
import java.util.List;

import com.hui.Machine;
import com.hui.food.Fish;
import com.hui.food.Food;
import com.hui.strategy.CookFishStrategy;

public class CookFishTest {
	
	public static void main(String[] args){
		CookFishTest cft = new CookFishTest();
		System.out.println("正常测试开始……");
		cft.regular();
		System.out.println("正常测试结束……");
	}
	
	private void regular(){
		Machine machine = Machine.getInstance();
		machine.openDoor();
		Fish fishA = new Fish();
		List<Food> fishList = new ArrayList<Food>();
		fishList.add(fishA);
		machine.putFood(fishList);
		machine.closeDoor();
		machine.setTime(10);
		machine.setCookStrategy(new CookFishStrategy(fishList));
		machine.operate();
	}
}
 

 

 

各种命令，以”煮“为例：

package com.hui.command;


public class BoilCommand implements Command {

	
	
	public void execute() {
		System.out.println("煮……");
	}

}

 

各种策略，以烹饪鱼为例：

package com.hui.strategy;

import java.util.ArrayList;
import java.util.List;

import com.hui.command.BoilCommand;
import com.hui.command.Command;
import com.hui.command.FryCommand;
import com.hui.command.HighCommand;
import com.hui.command.LowCommand;
import com.hui.command.MiddleCommand;
import com.hui.food.Fish;

public class CookFishStrategy implements CookStrategy{

	//这里使用List<Food>会出错，原因大抵是"苹果可以是水果的子类
	//,但装苹果的袋子不是装水果的袋子的子类"
	private List<?> fishList = new ArrayList<Fish>();
	
	public CookFishStrategy(List<?> fishList){
		this.fishList = fishList;
	}
	
	public void cook(){
		Command boil = new BoilCommand();
		boil.execute();
		Command high = new HighCommand();
		high.execute();
		Command middle = new MiddleCommand();
		middle.execute();
		Command low = new LowCommand();
		low.execute();
		Command fry = new FryCommand();
		fry.execute();
		System.out.println("烹饪结束!可以取出食物!");
	}
}

 

策略类的接口：

package com.hui.strategy;


public interface CookStrategy {

	public void cook();
}

 

微波炉主类：

package com.hui;

import java.util.List;

import com.hui.food.Food;
import com.hui.strategy.CookStrategy;

public class Machine {

	private CookStrategy cookStrategy;
	private List<Food> foodList;
	private static Machine instance;
	private int minutes;
	private byte[] lock = new byte[0]; 
	
	private Machine(){
		System.out.println("这有一个微波炉A……");
	}
	
	public static synchronized Machine getInstance(){
		if(instance == null){
			instance = new Machine();
		}
		return instance;
	}
	
	public void openDoor(){
		synchronized(lock){
			System.out.println("开门……");
		}
	}
	
	public void closeDoor(){
		System.out.println("关门……");
	}
	
	public void setTime(int minutes){
		System.out.println("设置时间" + minutes + "分钟!");
		this.minutes = minutes;
	}
	
	public void putFood(List<Food> foodList){
		System.out.println("放食物……");
		this.foodList = foodList;
	}

	public void setCookStrategy(CookStrategy cookStrategy) {
		this.cookStrategy = cookStrategy;
	}
	
	public void operate(){
		synchronized(lock){
			cookStrategy.cook();
		}
	}
}