注意：
java中的notifyAll和notify都是唤醒线程的操作，notify只会唤醒等待池中的某一个线程，但是不确定是哪一个线程，notifyAll是针对指定对象里面的所有线程执行唤醒操作，指定对象一旦唤醒成功。则会立即加入线程的资源争夺中去。
例如：
package TestThread.ThreadSynchronized;public class TestWaitAll {public static void main(String[] args) {Test1 test1 = new Test1();Thread t = new Thread(test1, "线程1");Thread t1 = new Thread(test1, "线程2");Thread t2 = new Thread(test1, "线程3");Test2 test2 = new Test2(test1, "唤醒线程");t.start();t1.start();t2.start();try {Thread.sleep(2000);} catch (InterruptedException e) {// TODO Auto-generated catch block e.printStackTrace();}test2.start();} }class Test1 implements Runnable {public void run() {synchronized (this) {try {this.wait();} catch (InterruptedException e) {e.printStackTrace();}System.out.println(Thread.currentThread().getName() + "当前没有被执行到！");}} }class Test2 extends Thread {private Test1 test1;String name;public Test2(Test1 test1, String name) {super(name);this.name = name;this.test1 = test1;}public void run() {synchronized (test1) {test1.notifyAll();// 针对当前对象执行唤醒所有线程的操作System.out.println(Thread.currentThread().getName() + ":唤醒线程执行成功！");}} }
执行结果为：
