-- How to Schedule a Task --

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In some application some tasks need to be run periodically for example GUI screen should update the data from server periodically.
This java tips illustrate a method of scheduling a task periodically. Developers may use it for repetitive invoking of a method as per their requirements.
For this aim, first you have to make a class extending TimerTask abstract class and write code in run method, you want to run repetitively.

import java.util.TimerTask;

public class Shedule extends TimerTask{
  public void run() {
    // add the task here
  }
}

In your main program you can call this code to schedule task:

    java.util.Timer timer = new java.util.Timer();

    Calendar date = Calendar.getInstance();
    date.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    date.set(Calendar.HOUR, 0);
    date.set(Calendar.MINUTE, 0);
    date.set(Calendar.SECOND, 0);
    date.set(Calendar.MILLISECOND, 0);

    //sheduler run now
    //timer.schedule(new Shedule(), 0, 60 * 60);
    // Schedule to run every Sunday in midnight
    timer.schedule(new Shedule(), date.getTime(), 1000 * 60 * 60 * 24 * 7);

Now the task will repeat after the fixed time interval.

more ref;
  --> http://www.developer.com/java/other/article.php/3564211

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