Java/Swing Components/Timer

Timer Bean

/**
 * @version 1.10 1999-09-28
 * @author Cay Horstmann
 */
import java.io.Serializable;
import java.util.Date;
import java.util.EventListener;
import java.util.EventObject;
import java.util.Vector;
public class TimerBean implements Runnable, Serializable {
  public int getInterval() {
    return interval;
  }
  public void setInterval(int i) {
    interval = i;
  }
  public boolean isRunning() {
    return runner != null;
  }
  public void setRunning(boolean b) {
    if (b && runner == null) {
      runner = new Thread(this);
      runner.start();
    } else if (!b && runner != null) {
      runner.interrupt();
      runner = null;
    }
  }
  public synchronized void addTimerListener(TimerListener l) {
    timerListeners.addElement(l);
  }
  public synchronized void removeTimerListener(TimerListener l) {
    timerListeners.removeElement(l);
  }
  public void fireTimerEvent(TimerEvent evt) {
    Vector currentListeners = null;
    synchronized (this) {
      currentListeners = (Vector) timerListeners.clone();
    }
    for (int i = 0; i < currentListeners.size(); i++) {
      TimerListener listener = (TimerListener) currentListeners
          .elementAt(i);
      listener.timeElapsed(evt);
    }
  }
  public void run() {
    if (interval <= 0)
      return;
    try {
      while (!Thread.interrupted()) {
        Thread.sleep(interval);
        fireTimerEvent(new TimerEvent(this));
      }
    } catch (InterruptedException e) {
    }
  }
  private int interval = 1000;
  private Vector timerListeners = new Vector();
  private Thread runner;
}
class TimerEvent extends EventObject {
  public TimerEvent(Object source) {
    super(source);
    now = new Date();
  }
  public Date getDate() {
    return now;
  }
  private Date now;
}
interface TimerListener extends EventListener {
  public void timeElapsed(TimerEvent evt);
}