JAVA程序设计课程作业——标准计算器的实现报告.doc

JAVA程序设计课程作业 关于计算器的设计说明 电信06XX班 王XX 012006012XXX 郭XX 012006012XXX 陈 X 012006012XXX一 实验目的1、 通过编写计算器程序，以达到熟悉和掌握JAVA的目的。2、 在编程的过程中，提升自己的能力。3、 能够有效的增强团队合作的能力。 二 实验内容 1、编写一个计算器，应该有如图类似的图形用户界面。 2、能够实现普通的加减乘除运算。 3、可以适当的增加一些科学计算器的功能。 三程序设计及源码实现： 程序设计结构： copyItem editItempasteItemtItem mainMenu viewMenu sItem (NORTH)numberGrouptopHelp helpMenuaboutHelp Panel textAnswer （CENTER） textMemory labelMenSpace Panel2 buttonN (NORTH) buttonBk button Ce button CPanel1 （SOUTH） button MC 7 8 9 Div Sqrt button MR 4 5 6 * % Panel3 button MS 1 2 3 - Dao (CENTER) button M+ 0 +/- Dot + +Calculator面板数字按钮触发事件加减乘除按钮触发事件=输出结果事件Sqr，%，+/-,CE,C,Backspace 按钮触发事件MR,MC,MS,M+按钮触发的事件源码如下：import java.awt.*; import java.lang.*; import javax.swing.*; import javax.swing.event.*; import java.awt.event.*; import java.text.DecimalFormat; public class Calculator implements ActionListener /导入动作监听接口 /设计面板中的组件 JFrame frame; JTextField textAnswer; JPanel panel, panel1, panel2, panel3; JMenuBar mainMenu; JTextField textMemory; JLabel labelMemSpace; /labelMemSpace单纯做摆设，控制面板的形状 JButton buttonBk, buttonCe, buttonC; JButton button; JButton buttonMC, buttonMR, buttonMS, buttonMAdd; JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul, buttonDiv, buttonMod ,buttonN; JButton buttonSqrt, buttonDao, buttonEqual; JMenu editMenu, viewMenu, helpMenu; JMenuItem copyItem, pasteItem, tItem, sItem, numberGroup, topHelp, aboutCal; DecimalFormat df; /设置数据输出精度 boolean clickable; /控制当前能否按键 double memoryd; /使用内存中存储的数字 int memoryi; double vard, answerd; /用来保存double型数据的中间值(vard)和最后结果(answerd) short key = -1, prekey = -1; /key用来保存当前进行何种运算,prekey用来保存前次进行何种运算 String copy; /做复制用 JTextArea help; /帮助 JScrollPane scrollHelp; /构造函数 public Calculator() clickable = true; answerd = 0; frame = new JFrame(计算器); df = new DecimalFormat(0.#); /设置数据输出精度(对于double型值) textAnswer = new JTextField(15); textAnswer.setText( ); textAnswer.setHorizontalAlignment(JTextField.RIGHT); /文本右对齐 textAnswer.setEditable(false); /设置为不可编辑 textAnswer.setBackground(new Color(255, 255,255);/白底色 panel = new JPanel(); frame.setContentPane(panel); / panel1 = new JPanel(); panel2 = new JPanel(); panel.setLayout(new BorderLayout(); /设计整个面板 mainMenu = new JMenuBar(); editMenu = new JMenu(编辑(E); viewMenu = new JMenu(查看(V); helpMenu = new JMenu(帮助(H); copyItem = new JMenuItem( 复制(C) Ctrl+C); copyItem.addActionListener(this); /增加动作事件监听 pasteItem = new JMenuItem( 粘贴(V) Ctrl+V); pasteItem.addActionListener(this); /增加动作事件监听 editMenu.add(copyItem); editMenu.add(pasteItem); tItem = new JMenuItem(标准型(T); tItem.addActionListener(this); /增加动作事件监听 sItem = new JMenuItem( 科学型(S); sItem.addActionListener(this); /增加动作事件监听 numberGroup = new JMenuItem( 数字分组(I); numberGroup.addActionListener(this); /增加动作事件监听 viewMenu.add(tItem); viewMenu.add(sItem); viewMenu.add(numberGroup); topHelp = new JMenuItem( 帮助主题(H); topHelp.addActionListener(this); /增加动作事件监听 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(A); aboutCal.addActionListener(this); helpMenu.add(topHelp); helpMenu.add(aboutCal); mainMenu.add(editMenu); mainMenu.add(viewMenu); mainMenu.add(helpMenu); panel.add(mainMenu, BorderLayout.NORTH); /利用布局管理器来布局面板，菜单在最上面 panel.add(textAnswer, BorderLayout.CENTER); panel.add(panel1, BorderLayout.SOUTH); panel1.setLayout(new BorderLayout(); textMemory = new JTextField(3); textMemory.setEditable(false); textMemory.setBackground(new Color(217, 217, 217); labelMemSpace = new JLabel( ); buttonBk = new JButton(Backspace); buttonBk.setForeground(new Color(255, 0, 0); buttonCe = new JButton(CE); buttonCe.setForeground(new Color(255, 0, 0); buttonC = new JButton(C); buttonC.setForeground(new Color(255, 0, 0); buttonN = new JButton(n!); buttonN.setForeground(new Color(255, 0, 0); buttonBk.addActionListener(this); /增加动作事件监听 buttonCe.addActionListener(this); buttonC.addActionListener(this); buttonN.addActionListener(this); panel1.add(panel2, BorderLayout.NORTH); panel2.setLayout(new FlowLayout(FlowLayout.RIGHT);/右对齐 panel2.add(textMemory); panel2.add(labelMemSpace); panel2.add(buttonN); panel2.add(buttonBk); panel2.add(buttonCe); panel2.add(buttonC); panel3 = new JPanel(); panel1.add(panel3, BorderLayout.CENTER); button = new JButton10; /数字键 for (int i = 0; i button.length; i+) buttoni = new JButton(Integer.toString(i); /数字按钮命名 buttoni.setForeground(new Color(0, 0, 255); /颜色为蓝色 buttonMC = new JButton(MC); buttonMC.setForeground(new Color(255, 0, 0); buttonMR = new JButton(MR); buttonMR.setForeground(new Color(255, 0, 0); buttonMS = new JButton(MS); buttonMS.setForeground(new Color(255, 0, 0); buttonMAdd = new JButton(M+); buttonMAdd.setForeground(new Color(255, 0, 0); buttonDot = new JButton(.); buttonDot.setForeground(new Color(0, 0, 255); buttonAddAndSub = new JButton(+/-); buttonAddAndSub.setForeground(new Color(0, 0, 255); buttonAdd = new JButton(+); buttonAdd.setForeground(new Color(255, 0, 0); buttonSub = new JButton(-); buttonSub.setForeground(new Color(255, 0, 0); buttonMul = new JButton(*); buttonMul.setForeground(new Color(255, 0, 0); buttonDiv = new JButton(/); buttonDiv.setForeground(new Color(255, 0, 0); buttonMod = new JButton(%); buttonMod.setForeground(new Color(0, 0, 255); buttonSqrt = new JButton(sqrt); buttonSqrt.setForeground(new Color(0, 0, 255); buttonDao = new JButton(1/x); buttonDao.setForeground(new Color(0, 0, 255); buttonEqual = new JButton(=); buttonEqual.setForeground(new Color(255, 0, 0); /将所有行为与监听绑定 panel3.setLayout(new GridLayout(4, 6,5,5);/对panel3进行布局分为4行6列 panel3.add(buttonMC); buttonMC.addActionListener(this); panel3.add(button7); button7.addActionListener(this); panel3.add(button8); button8.addActionListener(this); panel3.add(button9); button9.addActionListener(this); panel3.add(buttonDiv); buttonDiv.addActionListener(this); panel3.add(buttonSqrt); buttonSqrt.addActionListener(this); panel3.add(buttonMR); buttonMR.addActionListener(this); panel3.add(button4); button4.addActionListener(this); panel3.add(button5); button5.addActionListener(this); panel3.add(button6); button6.addActionListener(this); panel3.add(buttonMul); buttonMul.addActionListener(this); panel3.add(buttonMod); buttonMod.addActionListener(this); panel3.add(buttonMS); buttonMS.addActionListener(this); panel3.add(button1); button1.addActionListener(this); panel3.add(button2); button2.addActionListener(this); panel3.add(button3); button3.addActionListener(this); panel3.add(buttonSub); buttonSub.addActionListener(this); panel3.add(buttonDao); buttonDao.addActionListener(this); panel3.add(buttonMAdd); buttonMAdd.addActionListener(this); panel3.add(button0); button0.addActionListener(this); panel3.add(buttonAddAndSub); buttonAddAndSub.addActionListener(this); panel3.add(buttonDot); buttonDot.addActionListener(this); panel3.add(buttonAdd); buttonAdd.addActionListener(this); panel3.add(buttonEqual); buttonEqual.addActionListener(this); frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE); frame.pack(); frame.show(); /设置各个按钮行为 public void actionPerformed(ActionEvent event) / boolean sign = false; /判断是否是double型数参与运算，是为true，不是为false Object temp = event.getSource(); /temp 为事件源 try /如果按下数据按钮，将按下的按钮代表的数据插入的当前文本框字符串之后 for (int i = 0; i = 9; i+) if (temp = buttoni & clickable = true) if (prekey=5)/若上次为=号则先要清空屏幕，重新开始计算 textAnswer.setText( ); prekey=-1;/prekey复位 textAnswer.setText(textAnswer.getText() + Integer.toString(i); /将键入的数字存放在textAnswer中 /按下.按钮时，判断当前文本框内字符串中含不含.，如果已含，则不允许再插入. if (temp = buttonDot & clickable = true) boolean isDot = false; if (textAnswer.getText().length() = 0) isDot = true; /没有数字时可以键入小数点，键入后isDot设为true for (int i = 0; i textAnswer.getText().length(); i+) if (. = textAnswer.getText().charAt(i) /查找已输入部分有无小数点 isDot = true; break; /找到后跳出循环 if (isDot = false) /没有.则允许插入. textAnswer.setText(textAnswer.getText() + .); if ( (temp = buttonAdd | temp = buttonSub | temp = buttonMul |temp = buttonDiv) & clickable = true) /为+操作的情况 if (temp = buttonAdd) switch (prekey) case 0: /0为加，1为减法，2为乘法，3为除法 answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(error除数不能为零); /判断除数是否为零 clickable = false; /此时也不能再输入了 else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 0; /key为上一次加减乘除的符号 /为-时操作 if (temp = buttonSub) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 1; /为*操作时 if (temp = buttonMul) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 2; /为/操作时 if (temp = buttonDiv) switch (prekey) case 0: answerd += Double.parseDouble(textAnswer.getText(); break; case 1: answerd -= Double.parseDouble(textAnswer.getText(); break; case 2: answerd *= Double.parseDouble(textAnswer.getText(); break; case 3: if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; else answerd /= Double.parseDouble(textAnswer.getText(); break; default: answerd = Double.parseDouble(textAnswer.getText(); textAnswer.setText(); prekey = key = 3; /当输入=操作时 if (temp = buttonEqual & clickable = true) /如果连续按=,则进行连续运算 if (prekey = 5) if (key = 0)/最后一次是加法计算，所以连续加 answerd += vard; textAnswer.setText(df.format(answerd); if (key = 1) answerd -= vard; textAnswer.setText(df.format(answerd); if (key = 2) answerd *= vard; textAnswer.setText(df.format(answerd); if (key = 3) if (Double.parseDouble(textAnswer.getText() = 0) textAnswer.setText(除数不能为零); clickable = false; /禁用键盘 else answerd /= vard; textAnswer.setText(df.format(answerd); else vard = Double.parseDouble(textAnswer.getText();/vard为最后一次输入的数 if (key = 0) answerd += Double.parseDouble(textAnswer.getText();/ 计算结果 textAnswer.setText(df.format(answerd); /answerd格式化 if (key = 1) ans