java计算器源代码

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

public class calculator extends frame implements ActionListener WindowListener
{
    private Container container;
    private GridBagLayout layout;
    private GridBagConstraints constraints;
    private JTextField displayField;         //计算结果显示区
    private String lastCommand;           //保存+-*/=命令0
    private double result;               //保存计算结果
    private boolean start;           //判断是否为数字的开始
    private JMenuBar menubar;
    private JMenuItem m_exit;
    private JMenuItem m2_ejz;
    private JMenuItem m2_bjz;
    private Dialog dialog;
    private Label label_dialog;
    private JButton button_sqrt;
    private JButton button_plusminus;
    private JButton button_CE;
    private JButton b

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-08-16 01:24  .idea\
     文件         630  2018-08-16 01:21  .idea\compiler.xml
     目录           0  2018-08-16 01:25  .idea\inspectionProfiles\
     文件         439  2018-08-16 01:21  .idea\misc.xml
     文件         258  2018-08-16 01:19  .idea\modules.xml
     文件        8792  2018-08-16 01:21  .idea\uiDesigner.xml
     文件       19804  2018-08-16 01:24  .idea\workspace.xml
     文件         422  2018-08-16 01:19  pom.xml
     目录           0  2018-08-16 01:19  src\
     目录           0  2018-08-16 01:19  src\main\
     目录           0  2018-08-16 01:22  src\main\java\
     文件       13502  2018-08-16 01:22  src\main\java\calculator.java
     目录           0  2018-08-16 01:25  src\main\resources\
     目录           0  2018-08-16 01:19  src\test\
     目录           0  2018-08-16 01:25  src\test\java\
     文件         830  2018-08-16 01:21  swingdemo.iml
     目录           0  2018-08-16 01:22  target\
     目录           0  2018-08-16 01:22  target\classes\
     文件        1002  2018-08-16 01:22  target\classes\WinClose.class
     文件        8534  2018-08-16 01:22  target\classes\calculator.class
     目录           0  2018-08-16 01:22  target\generated-sources\
     目录           0  2018-08-16 01:25  target\generated-sources\annotations\