生产者-消费者

1.需求：生产者生产奶=》奶箱=》消费者消费

2.帮助类

1）BOX（奶箱）

package shapes;

public class Box{
    
    private int milk;
    private boolean state = false;
    
    public synchronized void put(int milk) {
        // 如果没有则等待
        if(state) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        // 有的话则生产
        this.milk = milk;
        System.out.println("送牛奶" + this.milk + "瓶放入奶箱。");
        state = true;
        
        //唤醒其它等待的线程
        notifyAll();
    }
    
    public synchronized void get() {
        // 如果没有，则等待生产
        if(!state) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        // 如果有，则消费
        System.out.println("用户拿到第" + this.milk + "瓶奶。");
        state = false;
        
        //唤醒其它等待的线程
        notifyAll();
    }
}

 

2）生产者

package shapes;

public class Product implements Runnable {
    private Box b;
    
    public Product(Box b) {
        this.b = b;
    }
    
    @Override
    public void run() {
        for(int i = 1; i <= 5; i++) {
            b.put(i);
        }
    }

}

 

3）消费者

package shapes;

public class Customer implements Runnable {
    private Box b;
    
    public Customer(Box b) {
        this.b = b;
    }
    
    @Override
    public void run() {
        while(true) {
            b.get();
        }
    }
}

4）运行主代码

package shapes;

public class Main {

    public static void main(String[] args) {
        //创建箱子
        Box b = new Box();
        //创建生产者
        Product p = new Product(b);
        //创建消费者
        Customer c= new Customer(b);
        
        Thread t1 = new Thread(p);
        Thread t2 = new Thread(c);
        
        //启动
        t1.start();
        t2.start();
        
    }
}

3.结果

 

 

参阅：https://www.bilibili.com/video/BV1vk4y117fU?p=340