Library tutorials & articles
Programming with Swing
- Introduction
- JFrame and JPanel
- JButton and JLabel
- Component Layout
- MDI Applications
- GUI Look & Feel
- Listening for Action
JButton and JLabel
JButton
Here's where the fun comes in, yep, we are going to add a component, a JButton. You know what a button is right? One of those funky little rectangles
that you click on and they go down and then pop back up again. Enough talk, you're probably
crapping your-self in anticipation, so here we go!
JFrame frame = new JFrame("Title Bar Text");
JPanel panel = new JPanel();
JButton button1 = new JButton("Button Text");
frame.setSize(256,256);
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
panel.add(button1);
frame.pack();
frame.show();
And there it is ladies and gentleman, two count 'em 2
new lines of code to create and add a JButton to our JPanel. Notice that when we added the
panel, we want to add it to the JFrame's contentpane and when we want to add the JButton, we
just plain add() it to the JPanel. This isn't exactly rocket science, if rocket science is
what you want, go here.
JLabel
Alright, now that you know how to add components to
the JPanel, I'm just going to tell you how to use the constructor method. I goes like this:
JLabel label1 = new JLabel("Label Text");
If you don't understand that, then you shouldn't be
reading this, go read up on classes and constructor methods. After you create the JLabel,
just add it to the JPanel like we did for JButton.
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Hello,
')
I want to add a closing button to the internal frame. I am not able to do it. Plz help.javascript:smilie('
confused
Hi.
I have an ChildFrame inside of an DesktopFrame. I want to insert a JButton into the ChildFrame. But this JButton turns out to be very tiny in that child frame. If I maximize the child frame, the button does not change size.
I used this a source for my codings:
http://www.rz.fhtw-berlin.de/hjp3/k100230.html
I only added a JButton into my chid frame, I used a GridBagLayout. button.setSize() does not seem to work in that child frame.
Would be very thankful, if anybody could help.
Burkhardt
jho....
just call your child frames as follows
public class MainFrame extends JFrame
{
ChildFrame1 child1;
public MainFrame()
{
final JDesktopPane desktop = new JDesktopPane();
getContentPane().add(desktop);
JMenuBar bar = new JMenuBar();
JMenu show = new JMenu("Show");
JMenuItem showchild1 = new JMenuItem("Show Child1");
//*******
// here this represents the MainFrame which can be passes as a message to the child frame.
child1 = new ChildFrame1(this);
//*******
desktop.add(child1);
child1.setVisible(true);
bar.add(show);
show.add(showchild1);
}
}
and in ChildFrame set the constructor as
MainFrame mainFrame;
ChildFrame(MainFrame mainFrame)
{
this.mainFrame = mainFrame;
}
actionPerformed in ChildFrame1() {
if(button clicked) {
ChilFrame2 childFrame2 = new ChildFrame2();
mainFrame.desktop.add(childFrame2);
this.dispose(); // or this.hide();
}
}
hope this code helps!
i have a JFrame named MainFrame which also uses JDesktoPane. I created 2 JInternalFrame class named ChildFrame1 and ChildFrame2. When I can click the menu on the mainframe, it shows the childframe1. I must load the Childframe2 on the desktopPane on the mainFrame by clicking a button inside the childframe1. How can I do this??? My problem is that the desktopPane becomes foreign to childFrame2 since it is another class. here is the sample prog...
public class MainFrame extends JFrame
{
ChildFrame1 child1 = new ChildFrame1();
public MainFrame()
{
final JDesktopPane desktop = new JDesktopPane();
getContentPane().add(desktop);
JMenuBar bar = new JMenuBar();
JMenu show = new JMenu("Show");
JMenuItem showchild1 = new JMenuItem("Show Child1");
desktop.add(child1);
child1.setVisible(true);
bar.add(show);
show.add(showchild1);
}
}
i still have another JInternalFrame class named childFrame2 but it will only be visible when i click a button in childFrame1 (child1).
how can i do this?????
i cannot use the jDESKTOPANE "desktop" because that class does not recognize the "desktop"
PLEASE HELP ME!!! I WILL DEFINITELY APPRECIATE YOUR HELP! THANKS A LOT!!!
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