Question

I’m trying to make so that when I press a button the program starts a method in a new thread.
The problem is that when I press the button the program freezes until the method is done running like i didn’t use a thread at all. Does anyone know how to solve this problem?

Thanks Morgan.

public Listeners()
{
  Calendar.ButtonAddReminder.addActionListener(new ButtonAddListener());
}

private class ButtonAddListener implements ActionListener
{
  public void actionPerformed(ActionEvent e) {
      new Thread(Calendar.reminder.Reminderchecker(Calendar.reminder.addReminder(date, str))) .start();
  }
}

Answer 1

From that, it looks like something in Calendar.reminder.addReminder() or Calendar.reminder.Reminderchecker() is taking some time and locking up the UI since that’s what’s happening in the EDT.

Edit: Oh, I see. You’re not doing what you think you’re doing. You’re executing Reminderchecker in the current thread. The Runnable returned by that method is what’s getting executed in the new thread. To run Reminderchecker in a thread, do something like:

new Thread(new Runnable() {
    public void run() {
        Calendar.reminder.Reminderchecker(...);
    }
}).start();

Better: Don’t spawn your own random threads like that. Use an organized concurrency strategy such as provided by an ExecutorService. The Executors class lets you easily create several that cover common uses.

Still better: Check out the SwingWorker and it API docs.