《面向对象程序设计》课程设计报告XX大学XXXX学院2012.10一、设计思路首先构建计算器的结构框架1、创建一个计算器外框Frame。
2、创建6个面板，其中：a)Panel1用于存放backspace,ce,c三键，1行，3列，水平间距5，垂直间距为5；b)Panel2用于存放数字区及运算区共20键，4行，5列，水平间距5，垂直间距为5；c)Panel3用于存放MC,MR,MS,M+键及显示M状态文本框（Panel6）；d)Panel4用于存放Panel1，Panel2；构成一个整体；e)Panel5存放显示器；f)Panel6 用于存放MC键上方框显示；3、创建各个按键，包括数字键、运算键、backspace,ce,c及MC,MR,MS,M+。
4、创建菜单条MenuBar及菜单项。
5、将各个元素添加到计算器外框Frame。
其次，设计运算逻辑函数actionPerformed（）最后，在主函数Main()中调用框架实现和actionPerformed（）二、程序功能本次课程设计的计算器所包括的功能有：数据的输入，加减乘除运算，开方运算，取倒数运算，取百分号运算，清空输入，数据的保存，读取，加倍，删除。
具体实现过程参见程序代码各模块的内容。
三、程序代码1）面板设计及其声明变量import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Calculation extends WindowAdapter implements ActionListener { double dResult = 0;double dNowInput = 0;double dMemory;int n = 0; //记载小数位数int nOperation = 1; // 记录运算符类型int nBitsNum = 0; //记录总共输入的位数boolean alreadyHaveDot = false; //已经有小数点？boolean keyAvailable = true;boolean alreadyClickedEqueal = false; //是否按下过"="?boolean isTempNowInput = false; //是否在计算出结果后直接按运算符将结果赋给了当前输入值？static JFrame f;//计算器框架static JPanel p1, p2, p3, p4, p5, p6;//模块化，见66行分配static JTextField tf1, tf2;//显示框及固定框static JButton b1, b2, b3, b4, b5, b6, b7, b8, b9, b0;//数字键static JButton bDiv, bSqrt, bMulti, bMinus, bPercent, bPlus, bReciprocal, bEqual, bDot, bNegative;//运算键static JButton bBackspace, bCE, bC, bMR, bMS, bMC, bM;//操作键/* 创建菜单条*/static MenuBar mba = new MenuBar();/* 创建菜单*/static Menu m_View = new Menu("visual");static Menu m_Edit = new Menu("edit");static Menu m_Help = new Menu("help");/* 创建m_View菜单项 */static MenuItem m_View_1 = new MenuItem("standard", new MenuShortcut(KeyEvent.VK_1));static MenuItem m_View_2 = new MenuItem("scientist", new MenuShortcut(KeyEvent.VK_2));static MenuItem m_View_3 = new MenuItem("programmer", new MenuShortcut(KeyEvent.VK_3));static MenuItem m_View_4 = new MenuItem("statistic", new MenuShortcut(KeyEvent.VK_T));static MenuItem m_View_5 = new MenuItem("history", new MenuShortcut(KeyEvent.VK_H));/* 创建m_Edit菜单项 */static MenuItem m_Edit_1 = new MenuItem("copy", new MenuShortcut(KeyEvent.VK_C));static MenuItem m_Edit_2 = new MenuItem("paste", new MenuShortcut(KeyEvent.VK_V));/* 创建m_Help菜单项 */static MenuItem m_Help_1 = new MenuItem("list help", new MenuShortcut(KeyEvent.VK_F1));static MenuItem m_Help_2 = new MenuItem("Made by Qiumoon");public void display() {f = new JFrame("计算器");f.setSize(400, 245);//面板宽，高f.setLocation(200, 200);f.setBackground(Color.LIGHT_GRAY);f.setResizable(false);f.setLayout(new BorderLayout(3, 3));p1 = new JPanel(new GridLayout(1, 3, 5, 5)); //用于存放backspace,ce,c 三键p2 = new JPanel(new GridLayout(4, 5, 5, 5)); //用于存放数字区及附近共20键, 此处间隙设置可能不合理，以后调整,4行；5列；水平间距5；垂直间距5p3 = new JPanel(new GridLayout(5, 5, 5, 5)); //用于存放MC,MR,MS,M+键及显示M状态文本框,此处间隙设置可能不合理，以后调整；及p6p4 = new JPanel(new FlowLayout()); //用于存放p1,p2p5 = new JPanel(new FlowLayout());//存放显示器p6 = new JPanel(new FlowLayout());//MC键上方框显示p4.add(p1);p4.add(p2);tf1 = new JTextField(35); //存放显示区tf1.setText("0.");tf1.setEditable(false);p5.add(tf1);/* 菜单栏相关设置 */mba.add(m_View);mba.add(m_Edit);mba.add(m_Help);m_View.add(m_View_1);m_View.add(m_View_2);m_View.add(m_View_3);m_View.addSeparator();m_View.add(m_View_4);m_View.add(m_View_5);m_Edit.add(m_Edit_1);m_Edit.add(m_Edit_2);m_Help.add(m_Help_1);m_Help.add(m_Help_2);f.add(p5, BorderLayout.NORTH);f.add(p4, BorderLayout.CENTER);f.add(p3, BorderLayout.WEST); f.setMenuBar(mba);b1 = new JButton("1");b2 = new JButton("2");b3 = new JButton("3");b4 = new JButton("4");b5 = new JButton("5");b6 = new JButton("6");b7 = new JButton("7");b8 = new JButton("8");b9 = new JButton("9");b0 = new JButton("0");b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);b4.addActionListener(this);b5.addActionListener(this);b6.addActionListener(this);b7.addActionListener(this);b8.addActionListener(this);b9.addActionListener(this);b0.addActionListener(this);bDiv = new JButton("/");bSqrt = new JButton("sqrt"); bMulti = new JButton("*"); bMinus = new JButton("-"); bPercent = new JButton("%"); bPlus = new JButton("+"); bReciprocal = new JButton("1/x"); bEqual = new JButton("="); bDot = new JButton("."); bNegative = new JButton("+/-"); bDiv.addActionListener(this); bSqrt.addActionListener(this); bMulti.addActionListener(this);bMinus.addActionListener(this); bPercent.addActionListener(this); bPlus.addActionListener(this); bReciprocal.addActionListener(this); bEqual.addActionListener(this);bDot.addActionListener(this); bNegative.addActionListener(this);p2.add(b7);p2.add(b8);p2.add(b9);p2.add(bDiv);p2.add(bSqrt);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(bMulti);p2.add(bPercent);p2.add(b1);p2.add(b2);p2.add(b3);p2.add(bMinus);p2.add(bReciprocal);p2.add(b0);p2.add(bNegative);p2.add(bDot);p2.add(bPlus);p2.add(bEqual);bBackspace = new JButton("Backspace"); bCE = new JButton("CE");bC = new JButton("C"); bBackspace.addActionListener(this); bCE.addActionListener(this);bC.addActionListener(this);p1.add(bBackspace);p1.add(bCE);p1.add(bC);tf2 = new JTextField(2);tf2.setEnabled(false);tf2.setBackground(Color.LIGHT_GRAY); bMC = new JButton("MC");bMR = new JButton("MR");bMS = new JButton("MS");bM = new JButton("M+");bMC.addActionListener(this);bMR.addActionListener(this);bMS.addActionListener(this);bM.addActionListener(this);p6.add(tf2);p3.add(p6);p3.add(bMC);p3.add(bMR);p3.add(bMS);p3.add(bM);f.setVisible(true);f.addWindowListener(this);}2）函数功能实现a．数字的输入public void actionPerformed(ActionEvent e) {//key 0 to 9if (this.keyAvailable && e.getActionCommand().length() == 1 && e.getActionCommand().compareTo("0") >= 0 && e.getActionCommand().compareTo("9") <= 0) {if (this.isTempNowInput) {this.dNowInput = 0;this.isTempNowInput = false;}this.nBitsNum++;if (this.alreadyHaveDot == false) {this.dNowInput = this.dNowInput * 10 + Double.parseDouble(e.getActionCommand());} else {double temp = Double.parseDouble(e.getActionCommand());for (int i = this.n; i < 0; i++) {temp *= 0.1;}this.dNowInput += temp;this.n--;}this.tf1.setText(Double.toString(this.dNowInput));}// key dotif (this.keyAvailable && e.getActionCommand() == ".") {if (this.alreadyHaveDot == false) {this.nBitsNum++;this.alreadyHaveDot = true;this.n = -1;}}b．加减乘除的实现//key "+","-","*","/"if (this.keyAvailable && e.getActionCommand() == "+" || e.getActionCommand() == "-" || e.getActionCommand() == "*" || e.getActionCommand() == "/") {if (this.alreadyClickedEqueal) {this.dNowInput = this.dResult;this.isTempNowInput = true;} else {switch (this.nOperation) {case 1:this.dResult += this.dNowInput;break;case 2:this.dResult -= this.dNowInput;break;case 3:this.dResult *= this.dNowInput;break;case 4: {if (this.dNowInput == 0) {tf1.setText("ERROR：除数不能为零");this.keyAvailable = false;} else {this.dResult = this.dResult / this.dNowInput;}}}if (this.keyAvailable) {tf1.setText(Double.toString(this.dResult));}this.dNowInput = 0;}if (e.getActionCommand() == "+") {this.nOperation = 1;}if (e.getActionCommand() == "-") {this.nOperation = 2;}if (e.getActionCommand() == "*") {this.nOperation = 3;}if (e.getActionCommand() == "/") {this.nOperation = 4;}this.nBitsNum = 0;this.alreadyClickedEqueal = false;}// key "+/-"if (this.keyAvailable && e.getActionCommand() == "+/-") { this.dNowInput = 0 - this.dNowInput;tf1.setText(Double.toString(this.dNowInput));}// key "C"if (e.getActionCommand() == "C") {this.nBitsNum = 0;this.dResult = 0;this.dNowInput = 0;this.alreadyHaveDot = false;this.n = 0;this.nOperation = 1;this.keyAvailable = true;this.alreadyClickedEqueal = false;tf1.setText("0.");}c．清空所有运算，归零功能// key "CE"if (e.getActionCommand() == "CE") {this.nBitsNum = 0;this.dNowInput = 0;this.alreadyHaveDot = false;this.n = 0;this.nOperation = 1;this.keyAvailable = true;tf1.setText("0.");}// key "sqrt"if (this.keyAvailable && e.getActionCommand() == "sqrt") { if (this.alreadyClickedEqueal) {if (this.dResult >= 0) {this.dResult = Math.sqrt(this.dResult);tf1.setText(Double.toString(this.dResult));} else {tf1.setText("ERROR：函数输入无效");this.keyAvailable = false;}} else {if (this.dNowInput >= 0) {this.dNowInput = Math.sqrt(this.dNowInput);tf1.setText(Double.toString(this.dNowInput));} else {tf1.setText("ERROR：函数输入无效");this.keyAvailable = false;}}}d．取倒数预算// key "1/x"if (this.keyAvailable && e.getActionCommand() == "1/x") { if (this.dNowInput == 0) {tf1.setText("ERROR：除数不能为零");this.keyAvailable = false;} else {this.dNowInput = 1 / this.dNowInput;tf1.setText(Double.toString(this.dNowInput));}}// key "="if (this.keyAvailable && e.getActionCommand() == "=") {this.alreadyClickedEqueal = true;switch (this.nOperation) {case 1:this.dResult += this.dNowInput;break;case 2:this.dResult -= this.dNowInput;break;case 3:this.dResult *= this.dNowInput;break;case 4: {if (this.dNowInput == 0) {tf1.setText("ERROR：除数不能为零");this.keyAvailable = false;} else {this.dResult = this.dResult / this.dNowInput;}}}if (this.keyAvailable) {tf1.setText(Double.toString(this.dResult));}}e．数据保存功能// key "MS"if (this.keyAvailable && e.getActionCommand() == "MS") {this.dMemory = this.dNowInput;if (this.dMemory != 0) {tf2.setText("M");}}f．保存数据清空// key "MC"if (this.keyAvailable && e.getActionCommand() == "MC") {this.dMemory = 0;tf2.setText("");}g．保存数据的读取// key "MR"if (this.keyAvailable && e.getActionCommand() == "MR") {this.dNowInput = this.dMemory;tf1.setText(Double.toString(this.dNowInput));}h．保存数据的加倍// key "M+"if (this.keyAvailable && e.getActionCommand() == "M+") {this.dMemory += this.dNowInput;if (this.dMemory != 0) {tf2.setText("M");} else {tf2.setText("");}}// key "%"if (this.keyAvailable && e.getActionCommand() == "%") {this.dNowInput = (this.dResult * this.dNowInput) / 100;tf1.setText(Double.toString(this.dNowInput));}i．删除一个输入数字// key "Backspace"if (this.keyAvailable && e.getActionCommand() == "Backspace") { if (!this.alreadyClickedEqueal) {if (this.dNowInput != 0) {if (this.alreadyHaveDot) {if (this.n == -1) {this.alreadyHaveDot = false;this.n = 0;} else {String str, str1;str = tf1.getText();str1 = str.substring(0, this.nBitsNum - 1);this.nBitsNum--;this.n++;this.dNowInput = Double.parseDouble(str1);tf1.setText(Double.toString(this.dNowInput));}} else {int temp;temp = (int) (this.dNowInput / 10);this.dNowInput = (double) temp;tf1.setText(Double.toString(this.dNowInput));}}}}}public static void main(String args[]) {Calculation cal = new Calculation();cal.display();}public void windowClosing(WindowEvent e) {System.exit(0);}}四、运行结果五、学习心得通过本次面向对象程序设计的学习，我们深刻意识到掌握一门编程语言的重要性。
