计算器编写

代码说明：

package com.java.lianxi; import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingConstants; public class Jisuanqi extends JFrame implements ActionListener { /**  *   */ private static final long serialVersionUID = 1L; Result result = new Result(); // 定义text的面板 Number_Key number_key = new Number_Key(); //