JAVA GUI学习

/**
 * JTable高级应用
 * @author Wfei
 *
 */
public class JTableKnow_C extends JFrame
{
    JTable jTable;
    MyJMenuItem jMenuItem;
    MyJMenuItem jMenuItem2;
    JPopupMenu jPopupMenu;
    JMenu jMenu;
    public JTableKnow_C()
    {
        this.setBounds(300, 100, 400, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        Object[][] tableData = new Object[3][4];
        tableData[0] = new Object[]{"1-1","1-2","左",true};
        tableData[1] = new Object[]{"2-1","2-2","右",false};
        tableData[2] = new Object[]{"3-1","3-2","左",true};
        Object[] tableColName = new Object[]{"第一列名","第二列名","第三列名","第四列名"};
        //创建表格模型
        DefaultTableModel defaultTableModel = new DefaultTableModel(tableData,tableColName);
        //实例化表格
        jTable = new JTable(defaultTableModel)
        {
            /**
             * 判断某一列是否为boolean类型，如果是：以复选框显示
             */
            @Override
            public Class<?> getColumnClass(int column)
            {
                // TODO Auto-generated method stub
                return jTable.getValueAt(0, column).getClass();
            }
            /**
             * 设置某一行、某一列、或某个单元格是否可编辑
             */
            @Override
            public boolean isCellEditable(int row, int column)
            {
                // TODO Auto-generated method stub
                if (row == 1 && column == 1)
                {
                    return false;
                }
                else {
                    return true;
                }
            }
            //表格的标题，必须配合滚动面板一起使用才能显示出来
        };
        //实例化滚动面板
        JScrollPane jScrollPane = new JScrollPane(jTable);
        this.add(jScrollPane);
        
        jPopupMenu = new JPopupMenu();
        jMenu = new JMenu("更改为：");
        jMenuItem = new MyJMenuItem("左",1);
        jMenuItem2 = new MyJMenuItem("右",1);
        jPopupMenu.add(jMenu);
        jMenu.add(jMenuItem);jMenu.add(jMenuItem2);
        
        jTable.setComponentPopupMenu(jPopupMenu);
        jPopupMenu.addPopupMenuListener(new PopupMenuListener()
        {
            /**
             * 设置个性化显示菜单的监听事件
             */
            @Override
            public void popupMenuWillBecomeVisible(PopupMenuEvent e)
            {
                int index = jTable.getSelectedRow();
                if (index != -1)
                {
                    String str = jTable.getValueAt(index, 2).toString();
                    if (str.equals("左"))
                    {
                        jMenuItem.setVisible(false);
                        jMenuItem2.setVisible(true);
                    }
                    else {
                        jMenuItem.setVisible(true);
                        jMenuItem2.setVisible(false);
                    }
                }
            }
            @Override
            public void popupMenuWillBecomeInvisible(PopupMenuEvent e)
            {
            }
            @Override
            public void popupMenuCanceled(PopupMenuEvent e)
            {
            }
        });
        //为菜单的每个jMenuItem加上监听器
//        addListenerToJMenuItem(jMenu);
    }
//    public void addListenerToJMenuItem(Container container)
//    {
//        for (Component component : container.getComponents())
//        {
//            if (component == JMenuItem.class)
//            {
//                System.out.println("1111111");
//                JMenuItem jMenuItem = (JMenuItem) component;
//                jMenuItem.addActionListener(new MenuItemListener());
//            }
//            else {
//                System.out.println("2222222");
//                JMenu jMenu = (JMenu) component;
//                addListenerToJMenuItem(jMenu);
//            }
//        }
//    }
    /**
     * 菜单项监听器
     * @author Administrator
     *
     */
    private class MenuItemListener implements ActionListener
    {

        @Override
        public void actionPerformed(ActionEvent e)
        {
            JMenuItem item = (JMenuItem)e.getSource();
            // TODO Auto-generated method stub
            //JOptionPane.showMessageDialog(null, item.getText());
            //判断是否有选中项
            if(jTable.getSelectedRow() != -1)
            {
                //判断按钮
                if (item == jMenuItem)
                {
                    JOptionPane.showMessageDialog(null, "已更改为：右");
                }
                else {
                    JOptionPane.showMessageDialog(null, "已更改为：左");
                }
            }
            else
            {
                JOptionPane.showMessageDialog(null, "请选择修改的用户");
            }
        }
        
    }
    public static void main(String[] args)
    {
        JTableKnow_C jTableKnowC = new JTableKnow_C();
        jTableKnowC.setVisible(true);
    }
}