hvordan skifter man mellem faneblade??

JTabbedPane jtp = new JTabbedPane();
..
int numberOfTabs = jtp.getTabCount();
int selectedTab = 3;
jtp.setSelectedIndex(selectedTab);

(Utestet kode)

JTabbedPane pane = ...;
følgende kode skulle vælge den næste tab, eller den første hvis ingen var valgt i forvejen. Hvis den sidste tab var valgt, vælges den første.
int tabs = pane.getTabCount();
int index = pane.getSelectedIndex();
if ( index == -1 ) index = tabs - 1; // vælge sidste tab
index = ( index + 1 ) % count; // ryk til "næste" tab
pane.setSelectedIndex( index ); // vælg tab

Et kompilerbart eksempel:


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Main
{
        public static void main(String args[])
        {
            new TestKlasseSwing().show();
        }
}

class TestKlasseSwing extends JFrame implements WindowListener, ActionListener
{
        private int frameWidth = 640;
        private int frameHeight = 480;
        private JTabbedPane tabPane;
        private JButton button;

        public TestKlasseSwing()
        {
            createFrame();
        }
       
        private void createFrame()
        {
            setTitle("TestKlasseSwing");
            addWindowListener(this);
           
            //components
            button = new JButton("button");
            button.addActionListener(this);
            this.getContentPane().add(button, BorderLayout.SOUTH);

            tabPane = new JTabbedPane();
            tabPane.addTab("tab1", null);
            tabPane.addTab("tab2", null);
            tabPane.addTab("tab3", null);
            tabPane.addTab("tab4", null);
            this.getContentPane().add(tabPane, BorderLayout.CENTER);           

            //Center Frame
            java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
            setSize(new java.awt.Dimension(frameWidth, frameHeight));
            setLocation( (screenSize.width-this.getWidth()) / 2, (screenSize.height - this.getHeight()) / 2);
        }
       
        public void windowOpened(WindowEvent e){}
        public void windowClosing(WindowEvent e){ dispose(); System.exit(0);}
        public void windowClosed(WindowEvent e){}
        public void windowIconified(WindowEvent e){}
        public void windowDeiconified(WindowEvent e){}
        public void windowActivated(WindowEvent e){}
        public void windowDeactivated(WindowEvent e){}

        public void actionPerformed(ActionEvent e)
        {
            int temp = tabPane.getSelectedIndex();
            temp++;
            if(temp >= tabPane.getTabCount())
                tabPane.setSelectedIndex(0);
            else
                tabPane.setSelectedIndex(temp);
        }
}

takker for den hurtige hjælp :-))

Instruktor