java 编写计算器－－监听者要为鼠标

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

public class Add implements ActionListener
{
//实现界面

private JFrame frame = new JFrame("Add");
private JTextField text1,text2,text3;
private JLabel label1,label2;
private JButton button = new JButton("OK");

public Add()
{
text1 = new JTextField(8);
text2 = new JTextField(8);
text3 = new JTextField(8);
label1 = new JLabel("+");
label2 = new JLabel("=");
text3.setEditable(false);

frame.getContentPane().setLayout(new FlowLayout());

frame.getContentPane().add(text1);
frame.getContentPane().add(label1);
frame.getContentPane().add(text2);
frame.getContentPane().add(label2);
frame.getContentPane().add(text3);
frame.getContentPane().add(button);

frame.pack();