Java Thread Tutorial - Java Thread State

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Stopping, Suspending, and Resuming a Thread

The following code demonstrates how to simulate the stop(), suspend(), and resume() methods of the Thread class in your thread.

public class Main extends Thread {
  private volatile boolean keepRunning = true;
  private boolean suspended = false;
  public synchronized void stopThread() {
    this.keepRunning = false;/*ww w .  j a  v  a  2 s .  c  o  m*/
    this.notify();
  }

  public synchronized void suspendThread() {
    this.suspended = true;
  }

  public synchronized void resumeThread() {
    this.suspended = false;
    this.notify();
  }

  public void run() {
    System.out.println("Thread started...");
    while (keepRunning) {
      try {
        System.out.println("Going to sleep...");
        Thread.sleep(1000);
        synchronized (this) {
          while (suspended) {
            System.out.println("Suspended...");
            this.wait();
            System.out.println("Resumed...");
          }
        }
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
  public static void main(String[] args) throws Exception {
    Main t = new Main();
    t.start();
    Thread.sleep(2000);
    t.suspendThread();
    Thread.sleep(2000);
    t.resumeThread();
    Thread.sleep(2000);
    t.stopThread();
  }
}

The code above generates the following result.

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