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Aziz

Mon Jul 18, 2005 3:46 pm


JFrame (or any frame) - Create VS Extend

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Is there any difference between creating and extending a JFrame?

Example:

Create

public class OpenAFrame
{
	public static void main(String

Extend

public class MyFrame extends JFrame
{
	public MyFrame()
	{
		setTitle("This is my frame");
		
		//Do some stuff//
		
		pack();
		setVisible(true);
	}
}

public class ShowMyFrame
{
	public static void main(String


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wtd

Mon Jul 18, 2005 7:33 pm



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Yes.  There's a very significant semantic difference.

By simple creating a JFrame object, you are constrained to the JFrame class' interface by way of its private members. 

By extending the class, you create your own class that "is a" JFrame.  It can do everything a JFrame can, but you can also add features, or override features inherited from JFrame.


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Aziz

Mon Jul 18, 2005 7:54 pm



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I think you've looked at my character manager program? The main frame is instantiated JFrame, and the editor frame is a extend JFrame (not proper termenology, i know), and i haven't really noticed a difference, is there a difference for what I'm doing? What form is best for what situation? A, great master, lend me your all-wise knowledge :) thanks.


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wtd

Mon Jul 18, 2005 8:40 pm



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I have no looked extensively at your character manager program.  I have a project currently underway.  It may show up in the C/C++ tutorials sections fairly soon.

I will say that neither is "better".  They are simply different.  Understanding what each method means will enable you to decide which to use in which situations.

Understand OOP.  Specifically inheritance and composition.


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Aziz

Mon Jul 18, 2005 9:08 pm



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So then, the question is of effeciency? Or, better yet, (just thought of this) whether you're simply using a frame for an application, or creating a frame to be used more than once? If you create an instance of JFrame, you're simply using JFrame's "features" (I guess thats what'd I called them?). But if I extend JFrame and make my own Frame, it could be a more specific frame, as in FormFrame where it consists of only form values (Labels, text components, etc?) Am I getting anywhere or do I think I know something and am running into a dead-end? It's all about the learning :)


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wtd

Mon Jul 18, 2005 10:56 pm



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But if I extend JFrame and make my own Frame, it could be a more specific frame

By George, I think he's got it!