Object.wait：施放对象锁、同时当前线程进入等待队列
Object.notify：唤醒第一个等待线程
package com.test.root.thread;
/**
* Object.wait() & Object.notify() 使用示例
*/
public class WaitAndNotifyExample {
private final Object lock = new Object();
private boolean isGetNeedResource = false;
private class WaitThread extends Thread {
@Override
public void run() {
System.out.println("WaitThread 等待拿锁");
synchronized (lock) {
System.out.println("WaitThread 拿到锁");
while (!isGetNeedResource) {
try {
System.out.println("WaitThread 未取得必要资源，施放锁并等待处理");
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("WaitThread 收到通知后继续执行");
}
System.out.println("WaitThread 获取到必要资源，逻辑处理完成");
}
}
}
public class NotifyThread extends Thread {
@Override
public void run() {
System.out.println("NotifyThread 等待拿锁");
synchronized (lock) {
System.out.println("NotifyThread 拿到锁");
isGetNeedResource = true;
System.out.println("NotifyThread 将资源置为可以使用");
lock.notify();
System.out.println("通知 WaitThread 线程");
}
}
}
public void runWaitThread(){
new WaitThread().start();
}
public void runNotifyThread(){
new NotifyThread().start();
}
public static void main(String[] args) {
WaitAndNotifyExample t = new WaitAndNotifyExample();
t.runWaitThread();
t.runNotifyThread();
}
}
提示：notify会唤醒一个等待线程，但是并不会施放对象锁，需要等待 synchronized 代码块执行完毕后才释放
