消费者与生产者

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

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

class WaitPerson implements Runnable{
    private Restaurant restaurant;
    public WaitPerson(Restaurant r){ restaurant = r; }
    
    @Override
    public void run() {
        // TODO Auto-generated method stub
        try{
            while(!Thread.interrupted()){
                synchronized(this){
                    while(restaurant.meal == null){ //餐馆没有菜单就等待，厨师生产出来。
                        wait();
                    }
                }
                System.out.println("服务员获得菜单：" + restaurant.meal);
                synchronized(restaurant.chef){
                    restaurant.meal = null;
                    restaurant.chef.notifyAll();
                }
            }
            
        }catch(InterruptedException e){
            System.out.println("WaitPerson interrupted");
        }
    }
    
}

class Chef implements Runnable{
    private Restaurant restaurant;
    private int count = 0;
    public Chef(Restaurant r) { restaurant = r; }
    
    @Override
    public void run() {
        // TODO Auto-generated method stub
        try{
            while(!Thread.interrupted()){
                synchronized(this){
                    while(restaurant.meal != null){  //生产者，当饭店有菜单时，就等待服务员拿走
                        wait();
                    }
                }
                if(++count == 10){
                    System.out.println("生产的食品超量!");
                    restaurant.exec.shutdownNow();
                }
                System.out.println("Order up");
                synchronized(restaurant.waitPerson){ //生产餐厅的菜单，这时要保证其间服务员不会介入，然后再通知服务员取菜单
                    restaurant.meal = new Meal(count);
                    restaurant.waitPerson.notifyAll();
                }
                TimeUnit.MILLISECONDS.sleep(100);
            }
        }catch(InterruptedException e){
            System.out.println("Chef interrupted");
        }
    }
}
public class Restaurant {
    Meal meal;
    
    ExecutorService exec = Executors.newCachedThreadPool();
    
    WaitPerson waitPerson = new WaitPerson(this);
    Chef chef = new Chef(this);
    public Restaurant(){
        exec.execute(chef);
        exec.execute(waitPerson);
        
    }
    public static void main(String[] args){
        new Restaurant();
    }
}

运行结果：

Order up
服务员获得菜单：Meal1
Order up
服务员获得菜单：Meal2
Order up
服务员获得菜单：Meal3
Order up
服务员获得菜单：Meal4
Order up
服务员获得菜单：Meal5
Order up
服务员获得菜单：Meal6
Order up
服务员获得菜单：Meal7
Order up
服务员获得菜单：Meal8
Order up
服务员获得菜单：Meal9
生产的食品超量!
WaitPerson interrupted
Order up
Chef interrupted