An inheriting question

[Martin Schneider]

I have a class which I extend in a two other class. That main-class has three panel and two of them would be same in those child-class but one panel should be modified. I just dont know how to make this happen :|

JPanel jPanel1 = new JPanel();
jPanel1 = super.jPanel1;

That doesnt work and I need some help.
Thanks in advance

[Chantal Ackermann]

hi,
I wouldn't subclass JFrame but rather composition. That is:
The main frame uses internally three JPanels. Two of these panels stay always the same. The third panel can be in different states. I don't know what factors affect the state of this panel but maybe you can use some method of constructor argument to control the behaviour of this panel.
Maybe you want to describe the intended behaviour of your gui more closely?
Chantal

[Chantal Ackermann]

sorry for posting again, but my first sentence was a bit messy. I mean:
I prefer composition to inheritance.
(And for what I know composition points most of the time to the more object oriented solution.)
C

[Martin Schneider]

Well, the idea is basically something like this:
I have login window and if login was succesfully main window will open. There is on top of login window and main window some "title panel" which has always the same look (that is diveded in two panels). Hope this cleared a little bit?

[Chantal Ackermann]

ok, now I see what you mean.
If you want to use inheritance maybe this sample code helps you:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public abstract class GeneralFrame
{
public GeneralFrame(String title)
{
frame = new JFrame(title);
final Container content = frame.getContentPane();
content.setLayout(new BorderLayout());
content.add(createGeneralPanel(), BorderLayout.NORTH);
content.add(createSpecialPanel(), BorderLayout.CENTER);
}
public void show()
{
frame.pack();
frame.setVisible(true);
}
protected JPanel createGeneralPanel()
{
JPanel panel = new JPanel();
// put the two panels that are always the same in this panel.
return panel;
}
protected abstract JPanel createSpecialPanel();
private final JFrame frame;
}
public class SpecialFrame extends GeneralFrame
{
public SpecialFrame()
{
super("special");
}
protected JPanel createSpecialPanel()
{
JPanel panel = new JPanel();
// add the special stuff
return panel;
}
}

cheers