More Enhancements in Java SE 6

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


public class TabbedPaneExample implements ActionListener {

    private JFrame frame;
    private JTabbedPane tabbedPane;
    private JButton addTabButton;
    
    private ImageIcon closeXIcon;
    private Dimension closeButtonSize;
    
    private int tabCounter = 0;
    
    public TabbedPaneExample() {

        //  Create the tabbed pane.
        
        tabbedPane = new JTabbedPane();
        
        //  Create a button that users can press to add a tab 
        //  to the tabbed pane.
        
        addTabButton = new JButton("Add Tab");
        addTabButton.addActionListener(this);
        
        //  Create a frame to hold the tabbed pane.
        
        frame = new JFrame();
        
        //  Create an image icon of the small 'X' for use with a close
        //  button on teach tab. The gif loaded is a 10x10 graphic 
        //  with transparency on areas that are not black.
        
        closeXIcon = new ImageIcon("C:/CloseX.gif");
        
        //  Create a Dimension that can be used to size the close
        //  buttons.
        
        closeButtonSize = new Dimension(
                closeXIcon.getIconWidth()+2,
                closeXIcon.getIconHeight()+2);
        
        //  Add the tabbed pane to the center of the graphic and the 
        //  "Add Tab" button to the south. Then pack it, size it,
        //  and show it.
        
        frame.add(tabbedPane, BorderLayout.CENTER);
        frame.add(addTabButton, BorderLayout.SOUTH);
        
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        frame.pack();
        frame.setMinimumSize(new Dimension(300, 300));
        frame.setVisible(true);
        
    }
    
    public void actionPerformed(ActionEvent e) {
        
        final JPanel content = new JPanel();
        
        //  Create a panel that represents the tab and ensure that it
        //  is transparent.
        
        JPanel tab = new JPanel();
        tab.setOpaque(false);
        
        //  Create a label and a Close button for the tab. Be sure to
        //  set its preferred size to nearly the size of the icon, and
        //  create an action listener that will locate the tab and 
        //  remote it from the tabbed pane.
        
        JLabel tabLabel = new JLabel("Tab " + (++tabCounter));
        
        JButton tabCloseButton = new JButton(closeXIcon);
        tabCloseButton.setPreferredSize(closeButtonSize);
        tabCloseButton.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                int closeTabNumber = 
                    tabbedPane.indexOfComponent(content);
                tabbedPane.removeTabAt(closeTabNumber);
            }
            
        });
        
        tab.add(tabLabel, BorderLayout.WEST);
        tab.add(tabCloseButton, BorderLayout.EAST);
        
        //  Add the tab to the tabbed pane. Note that the first
        //  parameter, which would ordinarily be a String that 
        //  represents the tab title, is null.
        
        tabbedPane.addTab(null, content);
        
        //  Instead of using a String/Icon combination for the tab,
        //  use our panel instead.
        
        tabbedPane.setTabComponentAt(tabbedPane.getTabCount()-1, tab);
        
    }
   
    public static void main(String[] args) {
        
        TabbedPaneExample main = new TabbedPaneExample();
    }
    
}