生产者消费者模型--修改多个线程的情况

约定不等于承诺〃 2022-08-09 09:44 163阅读 0赞

public class ProducerConsumerDemo { 
    
        public static void main(String[] args) {
            Resource r = new Resource();
            Producer pro = new Producer(r);
            Consumer con = new Consumer(r);
    
            Thread t1 = new Thread(pro);
            Thread t2 = new Thread(pro);
            Thread t3 = new Thread(con);
            Thread t4 = new Thread(con);
    
            t1.start();
            t2.start();
            t3.start();
            t4.start();
    
        }
    }
    
    class Resource { 
        private String name;
        private int count = 1;
        private boolean flag = false;  //flag用于判断本商品是否可被消费
    
        public synchronized void set(String name) {  // 向资源池中放入商品，并将flag置为true，表示此商品现在可以被消费
            while (flag)  
                try {
                    this.wait();
                } catch (InterruptedException e) {
                }
            this.name = name + "==" + (count++);
            System.out.println(Thread.currentThread().getName() + "==producer==" + this.name);
            flag = true;
            this.notifyAll();
        }
    
        public synchronized void out() {  // 从资源池中消费掉商品，并将flag置为false，表示本商品已经被消费了，所以不能再用了。
            while (!flag)
                try {
                    this.wait();
                } catch (InterruptedException e) {
                }
            System.out.println(Thread.currentThread().getName() + "====consumer====" + this.name);
            flag = false;
            this.notifyAll();
        }
    }
    
    class Producer implements Runnable { 
        private Resource res;
    
        Producer(Resource res) {
            this.res = res;
        }
    
        public void run() {
            while (true)
                res.set("+商品+");
        }
    }
    
    class Consumer implements Runnable { 
        private Resource res;
    
        Consumer(Resource res) {
            this.res = res;
        }
    
        public void run() {
            while (true)
                res.out();
        }
    }