GUI Components: Part 2 - Java: How to Program Early Objects - page 938

1 // Fig. 22.14: JTabbedPaneDemo.java

2 // Demonstrating JTabbedPane.

3 import javax.swing.JFrame;

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public class JTabbedPaneDemo

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{

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public static void main(String[] args)

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{

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JTabbedPaneFrame tabbedPaneFrame = new JTabbedPaneFrame();

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tabbedPaneFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

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tabbedPaneFrame.setSize( 250 , 200 );

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tabbedPaneFrame.setVisible( true );

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}

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} // end class JTabbedPaneDemo

Fig. 22.14 | Test class for JTabbedPaneFrame .

The constructor (lines 15-46) builds the GUI. Line 19 creates an empty JTabbedPane
with default settings—that is, tabs across the top. If the tabs do not fit on one line, they'll
wrap to form additional lines of tabs. Next the constructor creates the JPanel s panel1 ,
panel2 and panel3 and their GUI components. As we set up each panel, we add it to
tabbedPane , using JTabbedPane method addTab with four arguments. The first argument
is a String that specifies the title of the tab. The second argument is an Icon reference that
specifies an icon to display on the tab. If the Icon is a null reference, no image is displayed.
The third argument is a Component reference that represents the GUI component to dis-
play when the user clicks the tab. The last argument is a String that specifies the tool tip
for the tab. For example, line 25 adds JPanel panel1 to tabbedPane with title "Tab One"
and the tool tip "First Panel" . JPanel s panel2 and panel3 are added to tabbedPane at
lines 32 and 43. To view a tab, click it with the mouse or use the arrow keys to cycle
through the tabs.

22.9 BoxLayout Layout Manager
In Chapter 12, we introduced three layout managers— FlowLayout , BorderLayout and
GridLayout . This section and Section 22.10 present two additional layout managers
(summarized in Fig. 22.15). We discuss them in the examples that follow.