Monitor a thread's status.

 

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() );
  }
}

1.	Is thread alive
2.	Thread sleep
3.	Another way to stop a thread
4.	Another way to suspend and resume
5.	Visual suspend and resume
6.	Thread sleep and interrupt
7.	Daemon Thread
8.	Pausing the Current Thread: a thread can temporarily stop execution.
9.	Pausing a Thread: set a variable that the thread checks occasionally, call Object.wait()
10.	set Uncaught Exception Handler
11.	Pause the execution
12.	Interrupt a thread.
13.	Stopping a Thread: set a variable that the thread checks occasionally
14.	Determining When a Thread Has Finished
15.	Add a delay
16.	Pause the execution of a thread using sleep()

Monitor a thread's status. : Thread Status « Threads « Java

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