【新手求助】Java多线程（生产者消费者）中的问题，如何终止进程？

[Tom Leung]

下面是我的代码，有厨师（生产者）和服务员（消费者）两个任务类，
厨师在桌子上少于五道菜的时候会烧菜，服务业在桌子上有菜的时候会端走菜，
运行挺正常的但是就是不知道为什么停不下来……最后不是调用了exec的shutdown了吗？怎么还是无限运行？
如果改成shutdownNow的话会在sleep那里报错，然后继续无限运行……求解

还有就是代码有哪些错误和写的不好的地方？（第一次写这个肯定有很多…）

package com.imooc;

import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;


class Meal{
	private final int id;
	Meal(int id){
		this.id=id;
	}
	public String toString(){
		return "Meal: "+id;
	}
}

class Cook implements Runnable{
	private LinkedList<Meal> mealList;
	private static int count;
	Cook(LinkedList<Meal> mealList){
		this.mealList=mealList;
	}
	public void run(){
		while(!Thread.interrupted()){
			synchronized(mealList){
				while(mealList.size()<5){
					System.out.print("厨师正在做这个菜：");
					System.out.println(++count);
					mealList.add(new Meal(count));
					try {
						TimeUnit.MILLISECONDS.sleep(200);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				mealList.notifyAll();
				while(mealList.size()==5){
					System.out.println("厨师正在等服务员端走菜");
					try {
						mealList.wait();
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
		System.out.println("厨师下班了");
	}
}

class Waiter implements Runnable{
	private LinkedList<Meal> mealList;
	Waiter(LinkedList<Meal> mealList){
		this.mealList=mealList;
	}
	public void run(){
		while(!Thread.interrupted()){
			synchronized(mealList){
				while(mealList.size()>0){
					System.out.println("服务员正在端走这个菜："+mealList.getLast());
					mealList.removeLast();
					try {
						TimeUnit.MILLISECONDS.sleep(200);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				mealList.notifyAll();
				while(mealList.size()==0){
					System.out.println("服务员正在等厨师做菜");
					try {
						mealList.wait();
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
		System.out.println("服务员下班了");
	}
}

public class Manager {
	
	public static void main(String args[]) {
		LinkedList<Meal> mealList = new LinkedList<Meal>();
		ExecutorService exec = Executors.newCachedThreadPool();
		exec.execute(new Waiter(mealList));
		exec.execute(new Cook(mealList));
		exec.execute(new Waiter(mealList));
		exec.execute(new Waiter(mealList));
		exec.execute(new Cook(mealList));
		exec.shutdown();
	}

}

[Tom Leung]

运行效果是这样的