e840. determining when the selected tab changes in a jtabbedpane container.txt

这里面包含了一百多个JAVA源文件

A tabbed pane fires a change event whenever the selected tab is changed either by the user or programmatically. 
    // Create the tabbed pane
    JTabbedPane pane = new JTabbedPane();
    
    // Add tabs...; see e830 Adding a Tab to a JTabbedPane Container
    
    // Register a change listener
    pane.addChangeListener(new ChangeListener() {
        // This method is called whenever the selected tab changes
        public void stateChanged(ChangeEvent evt) {
            JTabbedPane pane = (JTabbedPane)evt.getSource();
    
            // Get current tab
            int sel = pane.getSelectedIndex();
        }
    });