要实现JTable的动态增加列和删出列，监听器里面的方法如何实现

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class JTableDemo2 extends JFrame {

private JPanel contentPane;
private JTextField textField;
private JTable table;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JTableDemo2 frame = new JTableDemo2();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame.
*/
public JTableDemo2() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JLabel label = new JLabel("\u5F53\u524D\u70B9\u51FB\u7684\u5185\u5BB9\u4E3A\uFF1A");
label.setBounds(70, 216, 126, 15);
contentPane.add(label);

textField = new JTextField();
textField.setBounds(222, 213, 66, 21);
contentPane.add(textField);
textField.setColumns(10);

JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(60, 26, 271, 166);
contentPane.add(scrollPane);

table = new JTable();
table.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
Object o=table.getValueAt(table.getSelectedRow(), table.getSelectedColumn());
textField.setText(o.toString());
}
}); 
 Object[][] cellData={
{new String("云长"),new Integer(61), new Integer(62), new Integer(63)},
{new String("翼德"),new Integer(64), new Integer(65), new Integer(66)},
{new String("子龙"),new Integer(67), new Integer(68), new Integer(69)},
{new String("汉升"),new Integer(70), new Integer(71), new Integer(72)},
{new String("孟起"),new Integer(73), new Integer(74), new Integer(75)},
{new String("凯哥"),new Integer(76), new Integer(77), new Integer(78)},
};
 String[] headers= {
"姓名","\u8BED\u6587", "\u6570\u5B66", "\u82F1\u8BED"
};
scrollPane.setViewportView(table);
final DefaultTableModel model = new DefaultTableModel(cellData, headers) ;
table.setModel(model);
JButton btnNewButton = new JButton("\u589E\u52A0\u5217");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { 
    model.addRow(new Object[]{"什么名","语文分","数学分","英语分"});//里面的东西你可以动态怎么获取赋值即可。
}
});
btnNewButton.setBounds(60, 0, 95, 25);
contentPane.add(btnNewButton);

JButton btnNewButton_1 = new JButton("\u5220\u9664\u5217");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { 
     int[] selRowIndexs=table.getSelectedRows();// 用户所选行的序列
     for(int i=0;i<selRowIndexs.length;i++){
        model.removeRow(table.getSelectedRow());
     }

}
});
btnNewButton_1.setBounds(165, 0, 95, 25);
contentPane.add(btnNewButton_1);
}
}