java写的简单 计算器（包括科学计算器的部分功能）

import java.awt.*; import java.awt.event.*; import javax.swing.*; //主函数 public class ScienceCalculator { public static void main(String[] args) { try { UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { System.err.println("Couldn't use the system look and feel:"+e); } EventQueue.invokeLater(new Runnable() { public void run() { ScienceCalculatorFrame frame=new ScienceCalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } } //界面设计 class ScienceCalculatorFrame extends JFrame implements ActionListener { public static final int DEFAULT_WIDTH=580; public static final int DEFAULT_HEIGHT=260; JMenuItem sItem; JMenuItem tItem; JMenuItem copyItem ; JMenuItem pasteItem; JMenuItem topHelp; JMenuItem aboutCal; JTextArea help; JScrollPane scrollHelp; String copy; JButton buttonBac; JButton buttonC; JButton buttonCE; JButton buttonLeftbracket; JButton buttonRightbracket; private JTextField textAnswer; private boolean start; private String lastCommand; private double result; private ButtonGroup group; //菜单设计 public ScienceCalculatorFrame() { setTitle("计算器"); this.setLocation(400, 300); setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT); setResizable(false); this.setBackground(Color.BLUE); ScienceCalculatorPanel panel = new ScienceCalculatorPanel(); add(panel); JMenu viewMenu = new JMenu("查看(V)"); tItem=new JMenuItem("●标准型(T)"); viewMenu.add(tItem); viewMenu.addSeparator(); sItem = new JMenuItem(" ●科学型(S)"); viewMenu.add(sItem); viewMenu.addSeparator(); JMenu editMenu = new JMenu("编辑(E)"); copyItem = new JMenuItem(" 复制(C) Ctrl+C"); editMenu.add(copyItem); editMenu.addSeparator(); pasteItem = new JMenuItem(" 粘贴(V) Ctrl+V"); editMenu.add(pasteItem); editMenu.addSeparator(); JMenu helpMenu = new JMenu("帮助(H)"); topHelp = new JMenuItem(" 使用方法(H)"); helpMenu.add(topHelp); helpMenu.addSeparator(); help = new JTextArea(5, 20); scrollHelp = new JScrollPane(help); help.setEditable(false); help.append("执行简单计算\n "); help.append("1. 键入计算的第一个数字。\n "); help.append("2. 单击“+”执行加、“-”执行减、“*”执行乘或“/”执行除。\n "); help.append("3. 键入计算的下一个数字。\n "); help.append("4. 输入所有剩余的运算符和数字。\n "); help.append("5. 单击“=”。\n "); aboutCal = new JMenuItem(" 关于计算器"); helpMenu.add(aboutCal); JMenuBar mainMenu = new JMenuBar(); setJMenuBar(mainMenu); mainMenu.add(viewMenu); mainMenu.add(editMenu); mainMenu.add(helpMenu); //ActionListener menu = new MenuAction(); tItem.addActionListener(this); copyItem.addActionListener(this); pasteItem.addActionListener(this); topHelp.addActionListener(this); aboutCal.addActionListener(this); } //菜单监听函数 public void actionPerformed(ActionEvent event) { Object temp = event.getSource(); if (temp == tItem) { //JOptionPane.showMessageDialog(sItem,"当前是标准型计算器， 科学型计算器有待更新。"); this.dispose(); CalculatorFrame cal = new CalculatorFrame(); cal.setVisible(true); } if(temp == copyItem ) { copy = textAnswer.getText(); } if (temp == pasteItem) { textAnswer.setText(copy); } if (temp == topHelp) { JOptionPane.showMessageDialog(topHelp, scrollHelp,"使用方法",JOptionPane.WARNING_MESSAGE); } if (temp == aboutCal) { //JOptionPane.showMessageDialog(aboutCal, "简易计算器 \n开发者：胡雪钦 \n版权所有"); JOptionPane.showMessageDialog(aboutCal, "科学计算器 \n开发者：胡雪钦 \n版权所有", "关于计算器",JOptionPane.WARNING_MESSAGE); } } //界面按钮的设计 private class ScienceCalculatorPanel extends JPanel { public ScienceCalculatorPanel() { setLayout(new BorderLayout()); start = true; lastCommand = "="; result = 0; GridBagLayout layout=new GridBagLayout(); setLayout(layout); //输出框 textAnswer= new JTextField(37); textAnswer.setText("0"); textAnswer.setEditable(false); textAnswer.setHorizontalAlignment(JTextField.RIGHT); textAnswer.setFont(new Font("Serif",Font.BOLD,17)); textAnswer.setBackground(Color.WHITE); add(textAnswer,new GBC(0,0,20,1).setFill(GBC.BOTH)); JPanel n1= new JPanel(); group = new ButtonGroup(); n1.setBorder(BorderFactory.createEtchedBorder()); //addRadioButton("度",BorderFactory.createLoweredBevelBorder()); JRadioButton buttona = new JRadioButton("度",true); JRadioButton buttonb = new JRadioButton("弧度"); JRadioButton buttonc = new JRadioButton("梯度"); group.add(buttona); group.add(buttonb); group.add(buttonc); n1.setLayout(new GridLayout(1,3)); n1.add(buttona); n1.add(buttonb); n1.add(buttonc); add(n1,new GBC(0,1,5,1).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonSpace = new JButton(" "); add(buttonSpace,new GBC(0,2).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonINV = new JButton("INV"); add(buttonINV,new GBC(1,2).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonLn= new JButton(" ln "); add(buttonLn,new GBC(2,2).setAnchor(GBC.EAST).setFill(GBC.BOTH)); buttonLeftbracket = new JButton("("); add(buttonLeftbracket,new GBC(3,2).setAnchor(GBC.EAST).setFill(GBC.BOTH)); buttonRightbracket = new JButton(")"); add(buttonRightbracket,new GBC(4,2).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonInt = new JButton(" Int "); add(buttonInt,new GBC(0,3).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonSinh = new JButton("sinh"); add(buttonSinh,new GBC(1,3).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonSin= new JButton(" sin"); add(buttonSin,new GBC(2,3).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonSquare = new JButton("x^2"); add(buttonSquare,new GBC(3,3).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonL = new JButton("n!"); add(buttonL,new GBC(4,3).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonDms = new JButton(" dms "); add(buttonDms,new GBC(0,4).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonCosh = new JButton("cosh"); add(buttonCosh,new GBC(1,4).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonCos= new JButton(" cos"); add(buttonCos,new GBC(2,4).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonX = new JButton("x^y"); add(buttonX,new GBC(3,4).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonXSqrt = new JButton("y√x"); add(buttonXSqrt,new GBC(4,4).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonPI = new JButton(" π "); add(buttonPI,new GBC(0,5).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonTanh = new JButton("tanh"); add(buttonTanh,new GBC(1,5).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonTan= new JButton("tan"); add(buttonTan,new GBC(3,5).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonCube = new JButton("x^3"); add(buttonCube,new GBC(4,5).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton button3Sqrt = new JButton("y√x"); add(button3Sqrt,new GBC(2,5).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonFE = new JButton("F-E "); add(buttonFE,new GBC(0,6).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonExp = new JButton("Exp"); add(buttonExp,new GBC(1,6).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonMOD= new JButton("Mod"); add(buttonMOD,new GBC(3,6).setAnchor(GBC.EAST).setFill(GBC.BOTH)); JButton buttonLog = new JButton("log");