e840. 监听JTabbedPane中选中卡片的改变

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 向JTabbedPane中加入一个卡片

    // 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();
        }
    });

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