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：