Programming Forums - How to return to an instance?

Programming Forums (http://www.programmingforums.org/forumindex.php)

- Java (http://www.programmingforums.org/forum17.html)

- - How to return to an instance? (http://www.programmingforums.org/showthread.php?t=15541)

How to return to an instance?

I am having a problem. If I have a JFrame open in a class and it performing and processing, when I close it, it still performs the work, which is good because this is what I want it to do. How do I actually return to that instance of the running program, if I go back to the main menu and click the button to load it up again, it makes a brand new instance. I need to return to the already running one.

Code for the back button

MainMenu m = new MainMenu();
m.setVisible(true);
dispose();

Code for loading up JFRAME Again from Main Menu

SandHopper sHopper = new SandHopper();
dispose();
sHopper.setVisible(true);

If someone can help me out here it would be great. Thank you.

Re: How to return to an instance?

You'll want a slightly different design where you keep a SandHopper object and instead of creating a new one each time you set it visible again. You can wrap this into a static method similar to this:

class SandHopper {

  private static SandHopper onlySandHopper;

  public static SandHopper GetSandHopper() {

    if(onlySandHopper == null) {

      onlySandHopper = new SandHopper();

    }

    return onlySandHopper;

  }



  // .. the rest of your class...

}

With this, you might want to make your constructors private, so that only GetSandHopper() can create one. The benefit to this: you reuse the same one all the time. The drawback: you can only have 1 SandHopper (if you want more than one, you can leave the constructors public, but anybody who calls GetSandHopper() will always use the same one).