Thread类的notifyAll()方法用于唤醒所有线程。此方法向特定对象的所有等待线程发出通知。

如果使用notifyAll()方法并且多个线程正在等待通知，那么所有线程都会收到通知，但线程的执行将逐个执行，因为线程需要锁定，并且只有一个锁可用于一个对象。

语法

public final void notifyAll()

返回

此方法不返回任何值。

异常

IllegalMonitorStateException ：如果当前线程不是对象监视器的所有者，则抛出此异常。

示例

class Notify1 extends Thread

{

public void run()

{

synchronized(this)

{

System.out.println("Starting of " + Thread.currentThread().getName());

try {

this.wait();

}

catch (InterruptedException e) {

e.printStackTrace();}

System.out.println(Thread.currentThread().getName() + "...notified");

}

}

}

class Notify2 extends Thread {

Notify1 notify1;

Notify2(Notify1 notify1)

{

this.notify1 = notify1;

}

public void run()

{

synchronized(this.notify1)

{

System.out.println("Starting of " + Thread.currentThread().getName());

try {

this.notify1.wait();

}

catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(Thread.currentThread().getName() + "...notified");

}

}

}

class Notify3 extends Thread

{

Notify1 notify1;

Notify3(Notify1 notify1)

{

this.notify1 = notify1;

}

public void run()

{

synchronized(this.notify1)

{

System.out.println("Starting of " + Thread.currentThread().getName());

// call the notifyAll() method

this.notify1.notifyAll();

System.out.println(Thread.currentThread().getName() + "...notified");

}

}

}

public class JavaNotifyAllExp

{

public static void main(String[] args) throws InterruptedException

{

Notify1 notify1 = new Notify1();

Notify2 notify2 = new Notify2(notify1);

Notify3 notify3 = new Notify3(notify1);

// creating the threads

Thread t1 = new Thread(notify1, "Thread-1");

Thread t2 = new Thread(notify2, "Thread-2");

Thread t3 = new Thread(notify3, "Thread-3");

// call run() method

t1.start();

t2.start();

Thread.sleep(100);

t3.start();

}

}

执行上面示例代码，得到以下结果：

Starting of Thread-1

Starting of Thread-2

Starting of Thread-3

Thread-3...notified

Thread-2...notified

Thread-1...notified

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