🚀 go-pugleaf

On Wed, 10 May 2000 17:05:38 -0400, Song Huang wrote:

> Hello
> 
> i have a question about closing a window(JFrame). Let's say:
> 
> public class MyGui extends JFrame{//this is a GUI
> ..............
> }
> 
> public class UsingMyGui{
> ...
> MyGui mygui = new MyGui();
> mygui.setVisible(true);
> ...
> }
> 
> Now i want to close this GUI from another class(which doesn't has access
> to the mygui variable). How can i do that?

You need to add a method to UsingMyGui that allows the other class to do 
this.  One way would be to add a "getter" to UsingMyGui to get the MyGui 
object:

    MyGui getGui() {
       return myGui;
    }

Another would be to add a method that just closes the GUI:

    void closeGui() {
       myGui.setVisible( false );
    }

Which should you use?  That depends a lot on the view that UsingMyGui 
wants to present to the outside world.  Is the MyGui object simply part 
of the implementation of UsingMyGui?  Should others know that it has a 
MyGui object, or should they just know that there is some sort of GUI 
that can be closed?

If you have any doubts, I would recommend starting with approach #2.

-- 
John P. McGrath
<JPMcGrath@fast.net>
<jpm@nscs.fast.net>