swing table

package com.test;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TableTest implements ActionListener{

 JFrame frame = new JFrame("JTable Test");
 JButton button = new JButton("增加");
 JTextField fname = new JTextField(20);
 JTextField lname = new JTextField(20);
 JPanel north = new JPanel();
 JLabel l1 = new JLabel("姓名");
 JLabel l2 = new JLabel("联系方式");
 DefaultTableModel dtm = new DefaultTableModel(0, 2);
 JTable table = new JTable(dtm);
 JScrollPane jsp = new JScrollPane(table);
 String [] temp = new String[2];
 
 public void init() {
  frame.setBounds(200, 200, 640, 480);
  frame.setLayout(new BorderLayout());
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setResizable(false);
  north.add(l1);
  north.add(fname);
  north.add(l2);
  north.add(lname);
  button.addActionListener(this);
  north.add(button);
  dtm.setColumnIdentifiers(new String[] {"姓名", "联系方式"});
  frame.add(north, BorderLayout.NORTH);
  frame.add(jsp, BorderLayout.CENTER);
  frame.setVisible(true);
 }
 
 
 public static void main(String[] args) {
  TableTest tt = new TableTest();
  tt.init();
 }

 public void actionPerformed(ActionEvent e) {
  temp[0] = fname.getText();
  temp[1] = lname.getText();
  System.out.print(dtm.getRowCount());
  dtm.insertRow(dtm.getRowCount(), temp);
 }

}