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1、JAVA 计算器原代码import java.awt.*; import java.awt.event.*; import javax.swing.*;public class MyCalculator implements ActionListener JFrame f; JMenu mEdit; JMenu mView; JMenu mHelp; JMenuItem mCopy; JMenuItem mPaste; JTextField tResult;JButton bNumber; JButton bOperator; JButton bOther; JButton bM;boolea
2、n isDouble=false;/是否为实数 int opFlag=-1; static double t1=0,t2=0,t3=0,result=0; static int opflag1=-1,opflag2=-1,flag=0,resflag=1; int preOp,currentOp=0;/标准位 double op1=0,op2=0;/操作数 double n3; StringBuffer buf=new StringBuffer(20); StringBuffer copyBoard=new StringBuffer(20);/剪贴板 StringBuffer memory =
3、 new StringBuffer(20);/M 系列 StringBuffer str = new StringBuffer(); public MyCalculator() f = new JFrame(“计算器 ByMdou“); Container contentPane = f.getContentPane(); /*菜单的创建开始*/ JMenuBar mBar = new JMenuBar(); mBar.setOpaque(true);mEdit = new JMenu(“编辑(E)“); mEdit.setMnemonic(KeyEvent.VK_E); mCopy = ne
4、w JMenuItem(“复制(C)“); mEdit.add(mCopy); mPaste = new JMenuItem(“粘贴(P)“); mEdit.add(mPaste);mView = new JMenu(“查看(V)“); mView.setMnemonic(KeyEvent.VK_V); mView.add(new JMenuItem(“标准型“); mView.add(new JMenuItem(“科学型“); mView.addSeparator(); mView.add(new JMenuItem(“查看分组“);mHelp = new JMenu(“帮助(H)“); m
5、Help.setMnemonic(KeyEvent.VK_H); mHelp.add(new JMenuItem(“帮助主题“); mHelp.addSeparator(); mHelp.add(new JMenuItem(“关于计算器“);mBar.add(mEdit); mBar.add(mView); mBar.add(mHelp); f.setJMenuBar(mBar); contentPane.setLayout(new BorderLayout(); JPanel pTop = new JPanel(); tResult = new JTextField(“0.“,26); tR
6、esult.setHorizontalAlignment(JTextField.RIGHT ); tResult.setEditable(false); pTop.add(tResult); contentPane.add(pTop,BorderLayout.NORTH); JPanel pBottom = new JPanel(); pBottom.setLayout(new BorderLayout(); JPanel pLeft = new JPanel(); pLeft.setLayout(new GridLayout(5,1,3,3); bM = new JButton(“ “);b
7、M.setEnabled(false); pLeft.add(bM); bOther = new JButton(“MC“); bOther.addActionListener(this); bOther.setForeground(Color.RED); bOther.setMargin(new Insets(3,2,3,2); pLeft.add(bOther); bOther = new JButton(“MR“); bOther.addActionListener(this); bOther.setForeground(Color.RED); bOther.setMargin(new
8、Insets(3,2,3,2); pLeft.add(bOther); bOther = new JButton(“MS“); bOther.addActionListener(this); bOther.setForeground(Color.RED); bOther.setMargin(new Insets(3,2,3,2); pLeft.add(bOther); bOther = new JButton(“M+“); bOther.addActionListener(this); bOther.setForeground(Color.RED); bOther.setMargin(new
9、Insets(3,2,3,2); pLeft.add(bOther); pBottom.add(pLeft,BorderLayout.WEST); JPanel pRight = new JPanel(); pRight.setLayout(new BorderLayout(); JPanel pUp = new JPanel(); pUp.setLayout(new GridLayout(1,3,3,0); bOther = new JButton(“Backspace“); bOther.addActionListener(this); bOther.setForeground(Color
10、.RED); bOther.setMargin(new Insets(3,0,3,5); pUp.add(bOther); bOther = new JButton(“CE“); bOther.addActionListener(this); bOther.setForeground(Color.RED); pUp.add(bOther); bOther = new JButton(“C“); bOther.addActionListener(this); bOther.setForeground(Color.RED); pUp.add(bOther); JPanel pDown = new
11、JPanel(); pDown.setLayout(new GridLayout(4,5,3,2); bNumber = new JButton(“7“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNumber); bNumber = new JButton(“8“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this)
12、; bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNumber); bNumber = new JButton(“9“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNumber); bOperator = new JButton(“/“); bOperator.setForeground(Color.RED); bOperator.addActio
13、nListener(this);bOperator.setMargin(new Insets(3,0,3,0); pDown.add(bOperator); bOperator = new JButton(“sqrt“); bOperator.addActionListener(this); bOperator.setForeground(Color.blue); bOperator.setMargin(new Insets(3,0,3,0); pDown.add(bOperator); bNumber = new JButton(“4“); bNumber.setForeground(Col
14、or.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); bNumber.setHorizontalTextPosition(JButton.LEFT); pDown.add(bNumber); bNumber = new JButton(“5“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNum
15、ber); bNumber = new JButton(“6“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNumber); bOperator = new JButton(“*“); bOperator.setForeground(Color.RED); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3
16、); pDown.add(bOperator); bOperator = new JButton(“%“); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3); pDown.add(bOperator); bNumber = new JButton(“1“); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3); pDown.add(bNumber); bNumber = new JButton(“2“); bNumber.setForeground(Color.blue); bNum
