notify和notifyAll

article/2025/11/6 1:23:25

notify:
notify只会唤醒众多等待线程中的其中一个线程
在这里插入图片描述
用包子铺案例来演示一下

package com.thread;/*** @author 邓亚非*/
public class TestNotify {private static Object object=new Object();public static void main(String[] args) {//        顾客1线程new Thread(new Runnable() {@Overridepublic void run() {synchronized (object){System.out.println("顾客1告诉老板要什么包子");try {object.wait();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("包子已经做好了,顾客1可以去买了");}}}).start();//        顾客2线程new Thread(new Runnable() {@Overridepublic void run() {synchronized (object){System.out.println("顾客2告诉老板要什么包子");try {object.wait();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("包子已经做好了,顾客2可以去买了");}}}).start();
//        老板线程new Thread(new Runnable() {@Overridepublic void run() {
//                5秒钟做包子try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (object){System.out.println("告诉顾客包子已经做好了");object.notify();}}}).start();}
}

测试:
在这里插入图片描述
notifyAll()方法会唤醒所有语句在等待的线程

我们再来模拟一下
代码:

package com.thread;/*** @author 邓亚非*/
public class TestNotify {private static Object object=new Object();public static void main(String[] args) {//        顾客1线程new Thread(new Runnable() {@Overridepublic void run() {synchronized (object){System.out.println("顾客1告诉老板要什么包子");try {object.wait();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("包子已经做好了,顾客1可以去买了");}}}).start();//        顾客2线程new Thread(new Runnable() {@Overridepublic void run() {synchronized (object){System.out.println("顾客2告诉老板要什么包子");try {object.wait();} catch (InterruptedException e) {e.printStackTrace();}System.out.println("包子已经做好了,顾客2可以去买了");}}}).start();
//        老板线程new Thread(new Runnable() {@Overridepublic void run() {
//                5秒钟做包子try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (object){System.out.println("告诉顾客包子已经做好了");object.notifyAll();}}}).start();}
}