GUI Components: Part 2 - Java: How to Program Early Objects - page 937

can be placed on a tab. If the component is a container, such as a panel, it can use any
layout manager to lay out several components on the tab. Class JTabbedPane is a subclass
of JComponent . The application in Figs. 22.13-22.14 creates one tabbed pane with three
tabs. Each tab displays one of the JPanel s— panel1 , panel2 or panel3 .

1 // Fig. 22.13: JTabbedPaneFrame.java

2 // Demonstrating JTabbedPane.

3 import java.awt.BorderLayout;

4 import java.awt.Color;

5 import javax.swing.JFrame;

6
7

import javax.swing.JTabbedPane;

import javax.swing.JLabel;

8 import javax.swing.JPanel;

9 import javax.swing.JButton;

10 import javax.swing.SwingConstants;

11
12 public class JTabbedPaneFrame extends JFrame

13 {

14 // set up GUI

15 public JTabbedPaneFrame()

16 {

17

super ( "JTabbedPane Demo " );

18
19 JTabbedPane tabbedPane = new JTabbedPane(); // create JTabbedPane

20
21 // set up pane11 and add it to JTabbedPane

22 JLabel label1 = new JLabel( "panel one" , SwingConstants.CENTER );

23 JPanel panel1 = new JPanel();

24 panel1.add(label1);

25 tabbedPane.addTab( "Tab One" , null , panel1, "First Panel" );

26

27 // set up panel2 and add it to JTabbedPane

28 JLabel label2 = new JLabel( "panel two" , SwingConstants.CENTER );

29 JPanel panel2 = new JPanel();

30 panel2.setBackground( Color.YELLOW );

31 panel2.add(label2);

32 tabbedPane.addTab( "Tab Two" , null , panel2, "Second Panel" );

33
34 // set up panel3 and add it to JTabbedPane

35 JLabel label3 = new JLabel( "panel three" );

36 JPanel panel3 = new JPanel();

37 panel3.setLayout( new BorderLayout());

38 panel3.add( new JButton( "North" ), BorderLayout.NORTH );

39 panel3.add( new JButton( "West" ), BorderLayout.WEST );

40 panel3.add( new JButton( "East" ), BorderLayout.EAST );

41 panel3.add( new JButton( "South" ), BorderLayout.SOUTH );

42 panel3.add(label3, BorderLayout.CENTER );

43 tabbedPane.addTab( "Tab Three" , null , panel3, "Third Panel" );

44
45 add(tabbedPane); // add JTabbedPane to frame

46 }

47 } // end class JTabbedPaneFrame

Fig. 22.13 | JTabbedPane used to organize GUI components.