Java notifyAll()方法
线程类的
notifyAll()方法用于唤醒所有线程。此方法将通知发送给特定对象的
所有等待线程。
如果我们使用notifyAll()方法并且有多个线程正在等待通知，则所有线程都将收到通知但是线程的执行将一个接一个地执行，因为线程需要一个锁，并且一个对象只能使用一个锁。
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，则会引发此异常。
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();
}
}
输出:
Starting of Thread-1Starting of Thread-2Starting of Thread-3Thread-3...notifiedThread-2...notifiedThread-1...notified
