多个生产者多个消费者，只有5个包子

package com.reveiew;
/*
* 多个生产者多个消费者，只有5个包子
* 跟第一，第二的例子不同的是，不是new一个对象调用锁，而是用BaoZi.calss直接调用锁
*/
public class MoreProuduceCustomMoreBaoZi {
public static void main(String[] args) {
Produce3 p = new Produce3();
p.setName("生产者");
Produce3 p2 = new Produce3();
p2.setName("生产者2");
Produce3 p3 = new Produce3();
p3.setName("生产者3");
customer3 c = new customer3();
c.setName("消费者");
customer3 c2 = new customer3();
c2.setName("消费者2");
customer3 c3 = new customer3();
c3.setName("消费者3");
p.start();
c.start();
p2.start();
c2.start();
p3.start();
c3.start();
}
}
class BaoZi3 {
public static int num = 0;
}
class Produce3 extends Thread {
public void run() {
while (true) {
synchronized (BaoZi3.class) {
while (BaoZi3.num >=5) {
// 等着消费者消费.生产者应该等待。需要用锁去调用wait方法。
try {
BaoZi3.class.wait();// wait会释放锁//哪个线程执行就是哪个线程等
} catch (InterruptedException e) {
e.printStackTrace();
}
}
BaoZi3.num++;
try {
Thread.sleep(1000);// sleep不会释放锁
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "生产一个包子"+"剩余包子"+BaoZi3.num);
BaoZi3.class.notifyAll();// 唤醒消费者
}
}
}
}
class customer3 extends Thread {
public void run() {
while (true) {
synchronized (BaoZi3.class) {
while (BaoZi3.num == 0) {
try {
BaoZi3.class.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
BaoZi3.num--;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "消费一个包子"+"剩余包子"+BaoZi3.num);
// 唤醒消费者
BaoZi3.class.notifyAll();// 唤醒当前等待的一个线程
}
}
}
}