java计算器源代码

/** * skw * 2008-09-11 */ package com.hust.skw; import java.awt.*; import java.awt.event.*; import javax.swing.*; class CalculatroFrame extends JFrame implements ActionListener,KeyListener{ private JMenuBar myB = new JMenuBar();//菜单栏 private JMenu menu1, menu2;//菜单 private char ch; //存储字符串中取得的一个字符 private boolean ft1 = false; //标志小数点 private boolean ft2 = false; //标志符号位 private double firstNum = 0; //存储输入运算符前的数据 private double operationNum=0.0;//用于进行一元运算 private double nextNum = 0; //存储输入运算符后的数据 private double nextNum0=0;//用来存储连续=运算时的第二个数 private double resultNum = 0; //算得最终浮点型结果 private double next=0;//用来处理连续运算的数 private String ys="";//用来存放连续运算的第一个运算符 private String ysf="";//用来存放连续按=之前的运算符 private String yunsuanfu = new String(); //存储输入的运算符 private String linshiStr = new String(); //存储临时的字符串 private String resultStr = new String(); //存储算得的最终字符串型结果 private String ss = new String(); //存储鼠标点击的按钮标号 private String fuzhi = new String(); //存储复制的字符串 private String fuzhi2=new String();//存储连续复制的字符串 private StringBuffer memory = new StringBuffer(20);//StringBuffer为字符串缓冲区 private JTextField shuru;//显示框 private JButton bt1[], bt2[];//按钮数组 private JPanel pa1, pa2;//面板 private GridLayout gri1, gri2;//布局 CalculatroFrame() { super("计算器"); setBackground(Color.lightGray);//设置窗口背景色 setLocation(400,400);//设置面板的位置 setSize(320,260);//设置窗口的大小 setResizable(false);//定义面板大小为固定 setLayout(new BorderLayout()); setJMenuBar(myB); menu1 = new JMenu("编辑(E)"); //为菜单设置快捷键Alt+E menu1.setMnemonic('E'); //三个菜单项 JMenuItem menu11 = new JMenuItem("复制"); JMenuItem menu12 = new JMenuItem("粘贴"); JMenuItem menu13 = new JMenuItem("退出"); //为菜单项设置快捷键 KeyStroke ks1 = KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_MASK); //复制　　Ctrl+C menu11.setAccelerator(ks1); KeyStroke ks2 = KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_MASK); //粘贴 Ctrl+V menu12.setAccelerator(ks2); KeyStroke ks3 = KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK); //退出 Ctrl+X menu13.setAccelerator(ks3); //为三个菜单项添加按钮事件监听器 menu11.addActionListener(this); menu12.addActionListener(this); menu13.addActionListener(this); menu1.add(menu11); menu1.add(menu12); menu1.add(menu13); menu1.addActionListener(this); myB.add(menu1); menu2 = new JMenu("帮助(H)"); menu2.setMnemonic('H'); JMenuItem menu21 = new JMenuItem("联系作者"); JMenuItem menu22 = new JMenuItem("版本声明"); //为菜单项设置快捷键 KeyStroke ks4 = KeyStroke.getKeyStroke(KeyEvent.VK_L, InputEvent.CTRL_MASK); menu21.setAccelerator(ks4); KeyStroke ks5 = KeyStroke.getKeyStroke(KeyEvent.VK_B, InputEvent.CTRL_MASK); menu22.setAccelerator(ks5); menu21.addActionListener(this); menu22.addActionListener(this); menu2.add(menu21); menu2.add(menu22); menu2.addActionListener(this); myB.add(menu2); shuru = new JTextField("0",24); shuru.setHorizontalAlignment(JTextField.RIGHT);//设置文本的对其方式 shuru.setEditable(false);//设置文本不可修改 add(shuru); shuru.addActionListener(this); //各个面板的网格布局 gri1 = new GridLayout(1, 5, 3, 0); pa1 = new JPanel(); pa1.setLayout(gri1); gri2 = new GridLayout(4, 6, 3,2); pa2 = new JPanel(); pa2.setLayout(gri2); bt2 = new JButton[24]; String k2[] = {"MC","7", "8", "9", "+", "Sqrt","MR", "4", "5", "6", "-", "%","MS", "1", "2", "3", "*", "1/x","M+", "0", "+/-", ".", "/", "=" }; for (int i = 0; i < 24; i++) { bt2[i] = new JButton(k2[i]); bt2[i].setMargin(new Insets(3,3,3,3)); pa2.add(bt2[i]); if (i==0||i == 4 || i == 6 || i == 10 || i == 12 || i == 16||i==18||i==22||i==23) bt2[i].setForeground(Color.red);//设置按钮上字体的颜色 else bt2[i].setForeground(Color.blue);//设置按钮上字体的颜色 bt2[i].addActionListener(this); } bt1 = new JButton[4]; String k1[] = {"","Backspace", "CE","C"}; for (int i=0; i <4; i++) { bt1[i] = new JButton(k1[i]); bt1[i].setMargin(new Insets(3,3,3,3)); bt1[i].setForeground(Color.red);//设置按钮上字体的颜色 pa1.add(bt1[i]); bt1[i].addActionListener(this); } bt1[0].setForeground(Color.black); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ dispose(); System.exit(0); } }); //定义键盘事件 addKeyListener(this); add(shuru, BorderLayout.NORTH); add(pa1, BorderLayout.CENTER); add(pa2, BorderLayout.SOUTH); pack(); setVisible(true); } //处理按钮事件 public void actionPerformed(ActionEvent e) { ss = e.getActionCommand();//存储所按按钮的标识 //声明版本 if (ss.equals("版本声明")) new AboutCalculator(this).setVisible(true); //联系作者 if (ss.equals("联系作者")) new ContactAuthor(this).setVisible(true); //单击菜单"复制"选项,复制当前文本框数据 if (ss.equals("复制")) fuzhi = shuru.getText(); //单击菜单"粘贴"选项,将复制的数据置入文本框中 if (ss.equals("粘贴")){ fuzhi2+=fuzhi; shuru.setText(fuzhi2); } //单击菜单"退出"选项,结束小程序 if (ss.equals("退出")) System.exit(0); if(ss.equals("MC")) { //如果是MC则清除缓冲区 String temp=""; memory.replace(0,memory.length(),temp); bt1[0].setText(" "); } else if(ss.equals("MR")) { //如果按键为MR则恢复缓冲区的数到文本框 if(memory.toString().equals("")){ shuru.setText("0"); }else{ shuru.setText(memory.toString()); } } else if(ss.equals("MS")) {//如果按键为MS则将文本框的数存入缓冲区 String s1=shuru.getText(); memory.replace(0,memory.length(),s1); //replace(int start, int end, String str) bt1[0].setText("M"); } else if(ss.equals("M+")) { //如果按键为MS则将文本框值与缓冲区的数相加但不显示结果。 String temp1=shuru.getText(); double dtemp=Double.parseDouble(temp1); String temp2=memory.toString(); dtemp+=Double.parseDouble(temp2); temp1=String.valueOf(dtemp); memory.replace(0,memory.length(),temp1); } //开平方 try { if (ss.equals("Sqrt")) { linshiStr = shuru.getText();//首先取得文本框中的数据 operationNum=Double.parseDouble(linshiStr);//转换成double型 if (operationNum < 0) throw new FuShu(); else{ operationNum = Math.sqrt(operationNum);//取平方根 resultStr = Double.toString(operationNum); shuru.setText(resultStr); //firstNum = resultNum; } } } catch (FuShu ee) { shuru.setText(ee.toString()); resultStr = shuru.getText(); } //利用循环将当前字符串中的最后一个字母删除 if (ss.equals("Backspace")) { linshiStr = shuru.getText();//首先取得文本框中的数据 if (!resultStr.equals(linshiStr)) {//计算所得到的结果不能进行此运算 shuru.setText(""); //比如现在有个数123，我们先设shuru="";经过下面的循环之后shuru="12" for (int i = 0; i < linshiStr.length() - 1; i++) { ch = linshiStr.charAt(i); shuru.setText(shuru.getText() + ch); } if (shuru.getText().equals("-")|| shuru.getText().equals("-0.")||shuru.getText().equals("0") ||shuru.getText().equals("0.0")||shuru.getText().equals("-0.0")||shuru.getText().equals("")) { shuru.setText("0"); linshiStr = null; } } } //求一个数的倒数 try { if (ss.equals("1/x")) { linshiStr = shuru.getText(); operationNum = Double.parseDouble(linshiStr); if(operationNum==0){ throw new DaoShu(); }else{ operationNum = 1 / operationNum; //一元