多线程-线程间通信-多生产者多消费者问题

package multithread4;

/*
 * 生产者，消费者。
 * 
 * 死锁 四个线程都等待没有被唤醒也是一种情况
 */

class Resource2{
    private String name;
    private int count = 1;
    private boolean flag = false;
    public synchronized void set(String name) {
        
/*if*/ while (flag) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                
            }
        }
        this.name = name + count;
        count++;
        System.out.println(Thread.currentThread().getName()+"..生产者.."+this.name);
        flag = true;
        notify();
    }
    public synchronized void out() {
/*if*/ while (!flag) {
            try {
                this.wait();
            } catch (InterruptedException e) {
                
            }
        }
        System.out.println(Thread.currentThread().getName()+"..消费者......"+this.name);
        flag = false;
        notify();
    }
}

class Producer implements Runnable{
    private Resource2 r;
    public Producer(Resource2 r) {
        this.r = r;
    }
    public void run() {
        while(true) {
            r.set("烤鸭");
        }
    }
}
class Consumer implements Runnable{
    private Resource2 r;
    public Consumer(Resource2 r) {
        this.r = r;
    }
    public void run() {
        while(true) {
            r.out();
        }
    }
}
public class ProducerConsumerDemo {

    public static void main(String[] args) {
        
        Resource2 r = new Resource2();
        Producer pro = new Producer(r);
        Consumer con = new Consumer(r);
        
        Thread t0 = new Thread(pro);
        Thread t1 = new Thread(pro);
        Thread t2 = new Thread(con);
        Thread t3 = new Thread(con);
        
        t0.start();
        t1.start();
        t2.start();
        t3.start();
    }

}