Create a scheduled task using timer : Timer « Development « Java Tutorial

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class Main extends TimerTask {
  private DateFormat formatter = new SimpleDateFormat("hh:mm:ss a");

  public static void main(String[] args) {
    TimerTask task = new Main();

    Timer timer = new Timer();
    timer.scheduleAtFixedRate(task, new Date(), 1000);
  }

  public void run() {
    System.out.println(formatter.format(new Date()));
  }
}

6.18.Timer
	6.18.1.	Using Timers
	6.18.2.	Demonstrate Timer and TimerTask.
	6.18.3.	Timer and TimerTask Classes
	6.18.4.	Pause and start a timer task
	6.18.5.	Create a Timer object
	6.18.6.	Swing also provide a Timer class. A Timer object will send an ActionEvent to the registered ActionListener.
	6.18.7.	Create a scheduled task using timer
	6.18.8.	Schedule a task by using Timer and TimerTask.
	6.18.9.	Scheduling a Timer Task to Run Repeatedly
	6.18.10.	extends TimerTask to create your own task
	6.18.11.	Your own timer
	6.18.12.	Class encapsulating timer functionality