java thread.notify_Java Thread notify()方法

Thread类的notify()方法用于唤醒单个线程。 此方法仅为一个等待特定对象的线程提供通知。

如果使用notify()方法并且有多个线程正在等待通知，那么只有一个线程获得通知，而剩下的线程必须等待进一步的通知。

语法

public final void notify()

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 notify() method

this.notify1.notify();

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

}

}

}

public class JavaNotifyExp

{

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-1...notified

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