JAVA 线程等待唤醒，wait and notify

wait,notify操作是同一个对象锁，简单例子如下

package com.cienet.wangbin.test;

public class Test7 {

/**

* @param args

*/

public static void main(String[] args) {

new Thread1().start();

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

new Thread2().start();

}

static class Thread1 extends Thread {

@Override

public void run() {

super.run();

int count = 10;

synchronized (Test7.class) {

for (int i = 0; i < count; i++) {

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

if (i == 2) {

try {

Test7.class.wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

System.out.println(i);

}

}

}

}

static class Thread2 extends Thread {

@Override

public void run() {

super.run();

int count = 10;

synchronized (Test7.class) {

for (int i = 0; i < count; i++) {

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

if (i == 5) {

Test7.class.notify();

}

System.out.println("b" + i);

}

}

}

}

}

如上结果可知，wait是会释放锁的，而notify不会释放锁，当调用它的时候，不能够直接唤醒wait住的线程，而是先等其本身执行完毕后才释放锁。wait住的资源才能获取锁，继续执行。