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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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