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How can we add new tabs to JTabbedPane from a JMenu in Java?
JTabbedPane
- A JTabbedPane is a component can extend JComponent class and it can provide easy access to more than one panel.
- Each tab is associated with a single component that can be displayed when the tab is selected.
- A JTabbedPane can generate a ChangeListener interface when a tab is selected.
- The important methods of JTabbedPane are add(), addTab(), fireStateChanged(), createChangeListener(), setSelectedIndex(), getTabCount() and etc.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class JTabbedPaneTest extends JFrame implements ActionListener {
JTabbedPane tabbedPane;
int ntabs = 0;
public JTabbedPaneTest() {
getContentPane().setLayout(new BorderLayout());
tabbedPane = new JTabbedPane();
createTab();
getContentPane().add(BorderLayout.CENTER, tabbedPane);
setJMenuBar(createMenuBar());
tabbedPane.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent ce) {
System.out.println("Tab " + (tabbedPane.getSelectedIndex() + 1) + " is selected");
}
});
setTitle("JTabbedPane Test");
setLocationRelativeTo(null);
setSize(new Dimension(350, 275));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
protected JMenuBar createMenuBar() {
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("JTabbedPane");
JMenuItem menuItem = new JMenuItem("Create new tab");
menuItem.addActionListener(this);
menu.add(menuItem);
menuBar.add(menu);
return menuBar;
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Create new tab")) {
createTab();
}
}
protected void createTab() {
ntabs++;
tabbedPane.addTab("Tab #" + ntabs, new JLabel("Tab #" + ntabs));
}
public static void main(String []args) {
new JTabbedPaneTest();
}
}
Output
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