Java详细实现完整计算器功能

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator implements ActionListener { JFrame f; JMenu mEdit; JMenu mView; JMenu mHelp; JMenuItem mCopy; JMenuItem mPaste; JTextField tResult; JButton bNumber; JButton bOperator; JButton bOther; JButton bM; boolean 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=new StringBuffer(20);//M系列 StringBuffer str=new StringBuffer(); //Java计算器 构造器 public Calculator() { f = new JFrame("计算器"); Container contentPane = f.getContentPane(); JMenuBar mBar = new JMenuBar(); mBar.setOpaque(true); mEdit = new JMenu("编辑(E)"); mEdit.setMnemonic(KeyEvent.VK_E); mCopy = new 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)"); mHelp.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.",28); tResult.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(" "); bM.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 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 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.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 JPanel(); pDown.setLayout(new GridLayout(4,5,3,2)); bNumber = new JButton("7"); bNumber.setForeground(Color.blue);//设置前景色 bNumber.addActionListener(this);//添加按钮监听事件 bNumber.setMargin(new Insets(3,3,3,3));//设置按钮边框和标签之间的空白 pDown.add(bNumber); bNumber = new JButton("8"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); 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.addActionListener(this); bOperator.setMargin(new Insets(3,0,3,0)); pDown.add(bOperator); bOperator = new JButton("sqrt"); bOperator.addActionListener(this); bOperator.setForeground(Color.red); bOperator.setMargin(new Insets(3,0,3,0)); pDown.add(bOperator); bNumber = new JButton("4"); bNumber.setForeground(Color.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(bNumber); 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)); 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); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("3"); 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)); pDown.add(bOperator); bOperator = new JButton("1/x"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); pDown.add(bOperator); bNumber = new JButton("0"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bOperator = new JButton("+/-"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("."); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("+"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("="); bOper