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Java Programming Question Eclipse


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Simmers Simmers is offline
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Experience: Intermediate
06-Aug-2012, 10:04 AM #1
Java Programming Question Eclipse

I am a beginner programmer and have Eclipse Java EE IDE for Web Developers (Version: Juno Release), I have a Windows 7 Home Premium PC.

My question is in Java using Eclipse, how would I change the color of a panel or button of a GUI window? How can I add a tabbed pane to the program I have? Would I need to create a new class for each? Would I need to create a new program and link it? Would I need to create a new class and then package it somehow? Or would I add to the existing program I want to add to and insert the code there?

I have this link: but I don't know how I would add this to my current existing program?

In the current code I have - the GUI frame is already coded and set to visible (shown below) so to change the panel color - would I just add "mainFrame.setColor(blue);"

Here's what's already there:
mainFrame.setSize(260, 150);


Also to add a tab - would I need to just add the following to the current program:

JTabbedPane tabbedPane = new JTabbedPane();
ImageIcon icon = createImageIcon("images/middle.gif");
JComponent panel1 = makeTextPanel("Panel #1");
tabbedPane.addTab("Tab 1", icon, panel1, "Does nothing");
tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);
JComponent panel2 = makeTextPanel("Panel #2");
tabbedPane.addTab("Tab 2", icon, panel2, "Does twice as much nothing");
tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);

//Add the tabbed pane to this panel.
//The following line enables to use scrolling tabs.
tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT); }
protected JComponent makeTextPanel(String text) {
JPanel panel = new JPanel(false);
JLabel filler = new JLabel(text);
panel.setLayout(new GridLayout(1, 1));
panel.add(filler); return panel; }
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) { imgURL = TabbedPaneDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null; } }

Thank you in advance for any help - much appreciated!
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aranea aranea is offline
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Join Date: Aug 2012
Experience: Advanced
19-Aug-2012, 06:13 AM #2
how would I change the color of a panel or button of a GUI window?
All descendands of JComponent have a method called setBackground() that you may use to set a new bacground color to a copmponent.
    btOK = new JButton("OK");
How can I add a tabbed pane to the program I have?
Typically you need an area on the screen controles by your program. In your case I think you should create a JForm, wich is a window on the screen. The form has a ContentPane where you can add components like a tabbed pane. Maybe you should also add a LayoutManager to your form.
Let's say you have the tabbed pane created. If it's nothing but a tabbed pane you won't see anything. You need to add named tabs to it. And you nbeed to add components to its different tab panes in order to see it working.
    form = new JForm();
    form.setSize(new Dimension(400,400));
    form.setLayout(new BorderLayout());
Would I need to create a new class for each?
No, there is no need for that. But if its function is not much related to the rest of the progam or it needs much code to work, it is usually better to separate it in its own class.

Or would I add to the existing program I want to add to and insert the code there?
When you subclass a pane you will probably add some extra components, colors or other features to it in the constructor. Then you can concentrate on creating the panel just by calling the constructor and all the other components will be created with the panel. You may, of course, choose to create the panel by calling the JPanel constructor and then add all components, colors and what else to it from the calling program.
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