How to monitor a thread's status?
Following example demonstrates how to monitor a thread's status by extending Thread class and using currentThread.getName() method.
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() ); } }
The above code sample will produce the following result.
main Alive=true State:=running
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