How can i hide a JFrame and then Show it again in runtime

Question

How can i hide a JFrame and then Show it again in runtime??
Please, please help me
Its URGENT

Answer 1

Here's even an example:
import javax.swing.*;
public class HideAndShow extends JFrame
     public HideAndShow()
          super("Hello");
          setSize(200, 200);
          setVisible(true);
          try
               Thread.sleep(2000);
          } catch(InterruptedException e) {}
          setVisible(false);
          try
               Thread.sleep(2000);
          } catch(InterruptedException e) {}
          setVisible(true);
     public static void main(String[] args)
          new HideAndShow();
The JFrame will show, then hide, then show again. This is at runtime.