Executing a task at a particular time interval using Schedular

public void startSchedular()
    {
        Scheduler scheduler = null;
        try
        {
String schedularTime=30 * * * 1-7//This will run after every 30 minutes for all 7 days
            scheduler = new Scheduler();
            scheduler.schedule(schedularTime, new Runnable()
            {
                @Override
                public void run()
                {
                    readEmails();
                }
            });
            scheduler.start();
        } catch (Exception e)
        {
            e.printStackTrace();// TODO: handle exception
            scheduler.stop();
        }
    }


To work with schedular download cron4j.jar
Schedular Patterns example

For More details Click here