package com.gf.demo08;
/**
* 生成者消费者案例，演示虚假唤醒问题
* 解决方式：if 改为 while
*
*/
public class TestProductorAndConsumer {
public static void main(String[] args) {
Clerk clerk = new Clerk();
Productor pro = new Productor(clerk);
Consumer cus = new Consumer(clerk);
new Thread(pro,"生产者A").start();
new Thread(cus,"消费者B").start();
new Thread(pro,"生产者C").start();
new Thread(cus,"消费者D").start();
}
}
//店员
class Clerk{
private int product = 0;
//进货
public synchronized void get(){
while(1 <= product){ // if 改为 while 解决虚假唤醒问题，应该总是使用在循环中
System.out.println("产品已满！");
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println(Thread.currentThread().getName()+" : " + ++product);
this.notifyAll();
}
//卖货
public synchronized void sale(){
while(0 >= product){ // if 改为 while 解决虚假唤醒问题，应该总是使用在循环中
System.out.println("缺货！");
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println(Thread.currentThread().getName()+" : " + --product);
this.notifyAll();
}
}
//生成者
class Productor implements Runnable{
private Clerk clerk;
public Productor(Clerk clerk) {
this.clerk = clerk;
}
@Override
public void run() {
for (int i = 0; i < 20; i++) {
try {
Thread.sleep(200); // 模拟网络延迟
} catch (InterruptedException e) {
e.printStackTrace();
}
clerk.get();
}
}
}
//消费者
class Consumer implements Runnable{
private Clerk clerk;
public Consumer(Clerk clerk) {
this.clerk = clerk;
}
@Override
public void run() {
for (int i = 0; i < 20; i++) {
clerk.sale();
}
}
}
关注我的公众号,精彩内容不能错过