Java如何监视线程的状态？

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在Java编程中，如何监视线程的状态？

以下示例演示如何通过扩展Thread类并使用currentThread.getName()方法来监视线程的状态。

package com.yiibai;class MyThread2 extends Thread {
boolean waiting = true;
boolean ready = false; MyThread2() {
} public void run() {
String thrdName = Thread.currentThread().getName();
System.out.println(thrdName + " starting.");
while (waiting)
System.out.println("waiting:" + waiting);
System.out.println("waiting...");
startWait();
try {
Thread.sleep(1000);
} catch (Exception exc) {
System.out.println(thrdName + " interrupted.");
}
System.out.println(thrdName + " terminating.");
} synchronized void startWait() {
try {
while (!ready)
wait();
} catch (InterruptedException exc) {
System.out.println("wait() interrupted");
}
} synchronized void notice() {
ready = true;
notify();
}
}public class MonitoringThread {
public static void main(String args[]) throws Exception {
MyThread2 thrd = new MyThread2();
thrd.setName("MyThread #1");
showThreadStatus(thrd);
thrd.start(); Thread.sleep(50);
showThreadStatus(thrd);
thrd.waiting = false; Thread.sleep(50);
showThreadStatus(thrd);
thrd.notice(); Thread.sleep(50);
showThreadStatus(thrd); while (thrd.isAlive())
System.out.println("alive");
showThreadStatus(thrd);
} static void showThreadStatus(Thread thrd) {
System.out.println(thrd.getName() + " Alive:=" + thrd.isAlive() + " State:=" + thrd.getState());
}
}


上述代码示例将产生以下结果 -

alive
alive
alive
alive
alive
............. 省略了一大波数据 ...............
alive
alive
MyThread #1 terminating.
alive
alive
alive
alive
alive
alive
alive
MyThread #1 Alive:=false State:=TERMINATED