生产者 和 消费者

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

/**
 * 生产者
 */
public class Producer implements Runnable {

    private Restaurant restaurant;
    private int count = 0;

    public Producer(Restaurant restaurant) {
        this.restaurant = restaurant;
    }

    @Override
    public void run() {
        try {
            while (!Thread.interrupted()) {
                synchronized (this) {
                    while (restaurant.meal != null) {
                        wait();// 等消费
                    }
                }
                if (++count == 10) {
                    System.out.println("买完了");
                    restaurant.exec.shutdownNow();
                }
                System.out.println("订单来了！");
                synchronized (restaurant.customer) {
                    restaurant.meal = new Meal(count);
                    System.out.println("做完了");
                    restaurant.customer.notifyAll();
                }

                TimeUnit.MILLISECONDS.sleep(100);
            }


        } catch (InterruptedException e) {
            System.out.println("消费者休息了！");
        }

    }

}

/**
 * 消费者
 */
public class Customer implements Runnable {

    private Restaurant restaurant;

    public Customer(Restaurant restaurant) {
        this.restaurant = restaurant;
    }

    @Override
    public void run() {
        try {
            while (!Thread.interrupted()) {
                synchronized (this) {
                    while (restaurant.meal == null) {
                        wait();// 等生产者生产
                    }
                }
                System.out.println("producer got " + restaurant.meal);
                synchronized (restaurant.customer) {
                    restaurant.meal = null;
                    restaurant.customer.notifyAll();
                }

            }
        } catch (InterruptedException e) {
            System.out.println("生产者休息了！");
        }

    }

}

public class Restaurant {

    Meal meal;
    ExecutorService exec = Executors.newCachedThreadPool();

    Producer producer = new Producer(this);
    Customer customer = new Customer(this);

    public Restaurant() {
        exec.execute(producer);
        exec.execute(customer);
    }

}

public class Main {

    public static void main(String[] args) {
        new Restaurant();
    }
}