java计算器源代码

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1、package计算器;importjava.awt.BorderLayout;importjava.awt.Color;importjava.awt.Font;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.KeyAdapter;importjava.awt.event.KeyEvent;importjava.math.BigDecimal;importjavax.swing.BorderFactory;

2、importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JMenu;importjavax.swing.JMenuBar;importjavax.swing.JPanel;importjavax.swing.JTextField;importjavax.swing.UIManager;importjavax.swing.UnsupportedLookAndFeelException;importjavax.swing.border.BevelBorder;

3、importjavax.swing.text.BadLocationException;publicclassCounter1extendsJFrameimplementsActionListener{publicstaticfinalintDEF_DIV_SCALE=10;//默认的精度privateJMenuBarjmBar=newJMenuBar();//菜单条privateJMenuedit=newJMenu("编辑(E)");privateJMenufind=newJMenu("查看(V)");privateJMenuhelp=newJMenu("帮助(H)");//创建JP

4、anel便于管理privateJPanelpanTxt=newJPanel();privateJPanelpanBack=newJPanel();privateJPanelpanMen=newJPanel();privateJPanelpanNum=newJPanel();//创建文本域privateJTextFieldtxt=newJTextField();//创建文本标签privateJLabeljlm=newJLabel();privatebooleanflag=false;//是否可以消除文本privatedoublea=0;//数字a的值privatedoubleb=0;//

5、数字b的值privatedoubleresult=0;//两个数字运算的结果privateStringsign="";//标记运算法则privatedoublem=0;//暂时储存数据//创建按钮privateNewButtonjbBack=newNewButton("Backspace",Color.RED);privateNewButtonjbCE=newNewButton("CE",Color.RED);privateNewButtonjbC=newNewButton("C",Color.RED);privateNewButtonjbMC=newNewButton("MC",Co

6、lor.RED);privateNewButtonjbMR=newNewButton("MR",Color.RED);privateNewButtonjbMS=newNewButton("MS",Color.RED);privateNewButtonjbM=newNewButton("M+",Color.RED);publicCounter1(){setSize(260,260);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setLocationRelativeTo(null);setLayout(null);setJMenuBar(j

7、mBar);setTitle("计算器");setResizable(false);init();//ContainercontentPane=getContentPane();//Controllerc=newController(this);//contentPane.addKeyListener(c);}privatevoidinit(){//设置第一个JPanel里面的内容panTxt.setSize(230,20);panTxt.se