Java状态监测

以下实例演示了如何通过继承 Thread 类并使用 currentThread.getName() 方法来监测线程的状态：/*

author by w3cschool.cc

Main.java

*/class MyThread extends Thread{

boolean waiting= true;

boolean ready= false;

MyThread() {

}

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 Main {

public static void main(String args[])

throws Exception{

MyThread thrd = new MyThread();

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());

}}

以上代码运行输出结果为：

……alive

aliveMyThread #1 terminating.alive……