TimerTask与Timer使用示范

2019-11-18 14:48:30

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import java.awt.Toolkit;
import java.util.Timer;
import java.util.TimerTask;

/**
* Schedule a task that executes once every second.
*/

public class AnnoyingBeep {
  Toolkit toolkit;

  Timer timer;

  public AnnoyingBeep() {
    toolkit = Toolkit.getDefaultToolkit();
    timer = new Timer();
    timer.schedule(new RemindTask(), 0, //initial delay
        1 * 1000); //subsequent rate
  }

  class RemindTask extends TimerTask {
    int numWarningBeeps = 3;

    public void run() {
      if (numWarningBeeps > 0) {
        toolkit.beep();
        System.out.PRintln("Beep!");
        numWarningBeeps--;
      } else {
        toolkit.beep();
        System.out.println("Time's up!");
        //timer.cancel(); //Not necessary because we call System.exit
        System.exit(0); //Stops the AWT thread (and everything else)
      }
    }
  }

  public static void main(String args[]) {
    System.out.println("About to schedule task.");
    new AnnoyingBeep();
    System.out.println("Task scheduled.");
  }
}

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