课程设计报告课程：模拟科学计算器学号：姓名：班级：教师：时间：10.12.10～11.01.12 计算机科学与技术系课程设计指导书姓名学号班级课程名称JAVA课程性质专业必修课设计时间2010年12 月10日——2011年01月12日设计名称模拟科学计算器设计目的巩固所学理论知识，提高程序设计能力的重要实践环节。
综合应用Java基础知识和基本方法。
设计要求界面模拟Windows中的计算器程序。
实现基本数学运算、函数等功能：加、减、乘、除、阶乘、正弦、余弦和指数运算。
实现要点：添加相关组件并进行按钮事件处理。
要求提交Application和Applet两个版本的程序。
设计思路与设计过程设计Application和Applet两个版本的程序，对Application运用继承JFrame设计，类的设计构造方法利用等。
而Applet则继承Applet，在浏览器上运行。
Application过程：1.菜单栏设计.2.文本域，即为计算器的屏幕显示区域3.初始化操作4.统一设置按钮的的使用方式5.计算器的基础操作（+ - ×÷）6.运算符号的事件监听7.清除按钮的事件监听8.数字输入的事件监听9.小数点的事件监听10.main方法Applet过程：1.init()方法：完成初始化操作；2.事件统一监听；3.科学计算；4.建立Calucator.html；5.浏览器运行；计划与进度12.10-12.13 复习Java程序开发的相关操作，了解“计算器相关知识”；12.14-12.17 熟悉题目并理解，及找寻相关资料；12.18-12.20 根据题目要求进行需求分析设计；12.21-12.25 对Application进行总体程序设计；12.26-12.30 对Applet进行相关各功能的程序设计；12.31-01.05 对程序进行细节完善；01.06-01.10 进行调试运行并完成资料归档。
任课教师意见备注设计名称：模拟科学计算器日期：2010年01月05日设计内容：Application和Applet两个版本的程序，实现基本数学运算、函数等功能：加、减、乘、除、阶乘、正弦、余弦和指数运算。
对Application运用继承JFrame设计，类的设计构造方法利用等。
而Applet则继承Applet，在浏览器上运行。
设计目的与要求：界面模拟Windows中的计算器程序。
实现基本数学运算、函数等功能：加、减、乘、除、阶乘、正弦、余弦和指数运算。
实现要点：添加相关组件并进行按钮事件处理。
要求提交Application和Applet两个版本的程序。
设计环境或器材、原理与说明：设计环境或器材：硬件：计算机软件：MyEclipse 集成开发环境Java JCreator Pro；设计原理说明：运用Application和Applet两个版本的程序。
设计过程（步骤）或程序代码(可以加页)：Application程序代码：import java.awt.*;import java.awt.event.*;import java.text.DecimalFormat;import javax.swing.*;public class Calucator extends JFrame {private JTextField tf;private JPanel panel1, panel2, panel3, panel4;private JMenuBar myBar;private JMenu menu1, menu2, menu3;private JMenuItem editItem1, editItem2, help1, help2, help3;private JRadioButtonMenuItem seeItem1, seeItem2;//单选框private JCheckBoxMenuItem seeItem3;//复选框private ButtonGroup bgb;private String back;private boolean IfResult = true, flag = false;private String oper = "=";private double result = 0;private Num numActionListener;private DecimalFormat df;public Calucator(){super("科学计算器");//设置标题栏df = new DecimalFormat("#.####");//保留四位小数this.setLayout(new BorderLayout(10, 5));panel1 = new JPanel(new GridLayout(1, 3, 10, 10));panel2 = new JPanel(new GridLayout(5, 6, 5, 5));//5行6列panel3 = new JPanel(new GridLayout(5, 1, 5, 5));panel4 = new JPanel(new BorderLayout(5, 5));/*** 菜单栏*/myBar = new JMenuBar();menu1 = new JMenu("编辑(E)");menu2 = new JMenu("查看(V)");menu3 = new JMenu("帮助(H)");menu1.setFont(new Font("宋体", Font.PLAIN, 12)); menu2.setFont(new Font("宋体", Font.PLAIN, 12)); menu3.setFont(new Font("宋体", Font.PLAIN, 12));/*** 编辑栏*/editItem1 = new JMenuItem("复制(C) Ctrl+C"); editItem2 = new JMenuItem("粘贴(P) Ctrl+V");editItem1.setFont(new Font("宋体",Font.PLAIN,12)); editItem2.setFont(new Font("宋体",Font.PLAIN,12));/*** 查看栏*/seeItem1 = new JRadioButtonMenuItem("科学型(T)"); seeItem2 = new JRadioButtonMenuItem("标准型(S)"); seeItem3 = new JCheckBoxMenuItem("数字分组(I)");seeItem1.setFont(new Font("宋体",Font.PLAIN,12)); seeItem2.setFont(new Font("宋体",Font.PLAIN,12)); seeItem3.setFont(new Font("宋体",Font.PLAIN,12));/*** 帮助栏*/help1 = new JMenuItem("帮助主题(H)");help2 = new JMenuItem("关于计算器(A)");help1.setFont(new Font("宋体",Font.PLAIN,12));help2.setFont(new Font("宋体",Font.PLAIN,12));bgb = new ButtonGroup();//选项组menu1.add(editItem1);menu1.add(editItem2);menu2.add(seeItem1);menu2.add(seeItem2);menu2.addSeparator();//添加一条分割线menu2.add(seeItem3);menu3.add(help1);menu3.addSeparator();//添加一条分割线menu3.add(help2);myBar.add(menu1);myBar.add(menu2);myBar.add(menu3);this.setJMenuBar(myBar); numActionListener = new Num();//实现数字监听/*** 文本域，即为计算器的屏幕显示区域*/tf = new JTextField();tf.setEditable(false);//文本区域不可编辑tf.setBackground(Color.white);//文本区域的背景色tf.setHorizontalAlignment(JTextField.RIGHT);//文字右对齐tf.setText("0");tf.setBorder(BorderFactory.createLoweredBevelBorder());init();//对计算器进行初始化}/*** 初始化操作* 添加按钮*/private void init(){addButton(panel1, "Backspace", new Clear(), Color.red);addButton(panel1, "CE", new Clear(), Color.red);addButton(panel1, "C", new Clear(), Color.red);addButton(panel2, "1/x", new Signs(), Color.magenta);addButton(panel2, "log", new Signs(), Color.magenta);addButton(panel2, "7", numActionListener, Color.blue);addButton(panel2, "8", numActionListener, Color.blue);addButton(panel2, "9", numActionListener, Color.blue);addButton(panel2, "÷", new Signs(), Color.red);addButton(panel2, "n!", new Signs(), Color.magenta); addButton(panel2, "sqrt", new Signs(), Color.magenta); addButton(panel2, "4", numActionListener, Color.blue); addButton(panel2, "5", numActionListener, Color.blue); addButton(panel2, "6", numActionListener, Color.blue); addButton(panel2, "×", new Signs(), Color.red);addButton(panel2, "sin", new Signs(), Color.magenta); addButton(panel2, "x^2", new Signs(), Color.magenta); addButton(panel2, "1", numActionListener, Color.blue); addButton(panel2, "2", numActionListener, Color.blue); addButton(panel2, "3", numActionListener, Color.blue); addButton(panel2, "-", new Signs(), Color.red);addButton(panel2, "cos", new Signs(), Color.magenta); addButton(panel2, "x^3", new Signs(), Color.magenta); addButton(panel2, "0", numActionListener, Color.blue); addButton(panel2, "-/+", new Clear(), Color.blue); addButton(panel2, ".", new Dot(), Color.blue); addButton(panel2, "+", new Signs(), Color.red);addButton(panel2, "tan", new Signs(), Color.magenta); addButton(panel2, "%", new Signs(), Color.magenta); addButton(panel2, "π", numActionListener, Color.orange); addButton(panel2, "e", numActionListener, Color.orange); addButton(panel2, "′″", new Signs(), Color.orange); addButton(panel2, "=", new Signs(), Color.red);JButton btns = new JButton("计算器");btns.setBorder(BorderFactory.createLoweredBevelBorder()); btns.setEnabled(false);//按钮不可操作btns.setPreferredSize(new Dimension(20, 20));panel3.add(btns);//加入按钮addButton(panel3, "MC", null, Color.red);addButton(panel3, "MR", null, Color.red);addButton(panel3, "MS", null, Color.red);addButton(panel3, "M+", null, Color.red);panel4.add(panel1, BorderLayout.NORTH);panel4.add(panel2, BorderLayout.CENTER);this.add(tf, BorderLayout.NORTH);this.add(panel3, BorderLayout.WEST);this.add(panel4);pack();this.setResizable(false);//窗口不可改变大小this.setLocation(300, 200);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}/*** 统一设置按钮的的使用方式* @param panel* @param name* @param action* @param color*/private void addButton(JPanel panel, String name, ActionListener action, Color color){JButton bt = new JButton(name);panel.add(bt);//在面板上增加按钮bt.setForeground(color);//设置前景（字体）颜色bt.addActionListener(action);//增加监听事件}/*** 计算器的基础操作（+ - ×÷）* @param x*/private void getResult (double x){if(oper == "+"){result += x;}else if(oper == "-"){result -= x;}else if(oper == "×"){result *= x;}else if(oper == "÷"){result /= x;}else if(oper == "="){result = x;}tf.setText(df.format(result));}/*** 运算符号的事件监听*/class Signs implements ActionListener{public void actionPerformed(ActionEvent e) {/** 用ActionEvent对象的getActionCommand()方法* 取得与引发事件对象相关的字符串*/String str = e.getActionCommand();/* sqrt求平方根*/if(str.equals("sqrt")){double i = Double.parseDouble(tf.getText());if(i>=0){/** String.valueOf() 转换为字符串* df.format() 按要求保留四位小数* Math.sqrt() 求算数平方根*/tf.setText(String.valueOf(df.format(Math.sqrt(i))));}else{tf.setText("负数不能开平方根");}}/* log求常用对数*/else if(str.equals("log")){double i = Double.parseDouble(tf.getText());if(i>0){tf.setText(String.valueOf(df.format(Math.log(i))));}else{tf.setText("负数不能求对数");}}/* %求百分比*/else if(str.equals("%")){tf.setText(df.format(Double.parseDouble(tf.getText()) / 100));}/* 1/x求倒数*/else if(str.equals("1/x")){if(Double.parseDouble(tf.getText()) == 0){tf.setText("除数不能为零");}else{tf.setText(df.format(1 / Double.parseDouble(tf.getText())));}}/* sin求正弦函数*/else if(str.equals("sin")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.sin(i)))); }/* cos求余弦函数*/else if(str.equals("cos")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.cos(i)))); }/* tan求正切函数*/else if(str.equals("tan")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.tan(i)))); }/* n!求阶乘*/else if(str.equals("n!")){double i = Double.parseDouble(tf.getText());if((i%2==0)||(i%2==1))//判断为整数放进行阶乘操作{int j = (int)i;//强制类型转换int result=1;for(int k=1;k<=j;k++)result *= k;tf.setText(String.valueOf(result));}else{tf.setText("无法进行阶乘");}}/* x^2求平方*/else if(str.equals("x^2")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i)));}/* x^3求立方*/else if(str.equals("x^3")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i*i)));}/* ′″角度转换*//*** 将角度值转换成弧度值，方便三角函数的计算*/else if(str.equals("′″")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(i/180*Math.PI));}else{if(flag){IfResult = false;}if(IfResult){oper = str;}else{getResult(Double.parseDouble(tf.getText()));oper = str;IfResult = true;}}}}/*** 清除按钮的事件监听*/class Clear implements ActionListener{public void actionPerformed(ActionEvent e) {/** 用ActionEvent对象的getActionCommand()方法* 取得与引发事件对象相关的字符串*/String str = e.getActionCommand();if(str == "C"){tf.setText("0");IfResult = true;result = 0;}else if(str == "-/+"){double i = 0 - Double.parseDouble(tf.getText().trim());tf.setText(df.format(i));}else if(str == "Backspace"){if(Double.parseDouble(tf.getText()) > 0){if(tf.getText().length() > 1){tf.setText(tf.getText().substring(0, tf.getText().length() - 1));//使用退格删除最后一位字符}else{tf.setText("0");IfResult = true;}}else{if(tf.getText().length() > 2){tf.setText(tf.getText().substring(0, tf.getText().length() - 1));}else{tf.setText("0");IfResult = true;}}}else if(str == "CE"){tf.setText("0");IfResult = true;}}}/*** 数字输入的事件监听*/class Num implements ActionListener{public void actionPerformed(ActionEvent e) { String str = e.getActionCommand();if(IfResult){tf.setText("");IfResult = false;}if(str=="π"){tf.setText(String.valueOf(Math.PI));}else if(str=="e"){tf.setText(String.valueOf(Math.E));}else{tf.setText(tf.getText().trim() + str);if(tf.getText().equals("0")){tf.setText("0");IfResult = true;flag = true;}}}}/*** 小数点的事件监听*/class Dot implements ActionListener{public void actionPerformed(ActionEvent e) { IfResult = false;if(tf.getText().trim().indexOf(".") == -1){tf.setText(tf.getText() + ".");}}}/*** main方法*/public static void main(String[] args) {new Calucator().setVisible(true);}}Applet程序代码：import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.applet.*;public class Calucator extends JApplet implements ActionListener {boolean i=true;private JButton num0=new JButton("0");private JButton num1=new JButton("1");private JButton num2=new JButton("2");private JButton num3=new JButton("3");private JButton num4=new JButton("4");private JButton num5=new JButton("5");private JButton num6=new JButton("6");private JButton num7=new JButton("7");private JButton num8=new JButton("8");private JButton num9=new JButton("9"); private JButton zuok=new JButton("("); private JButton youk=new JButton(")"); private JButton dian=new JButton("."); private JButton NULL=new JButton("N"); private JButton plu=new JButton("+"); private JButton min=new JButton("-"); private JButton mul=new JButton("x"); private JButton div=new JButton("/");private JButton equ=new JButton("="); private JButton cle=new JButton("C");//清除private JTextField space=new JTextField(30); public void init(){JPanel text=new JPanel();text.setLayout(new FlowLayout());text.add(space);JPanel buttons=new JPanel();buttons.setLayout(new GridLayout(5,4)); buttons.add(num9);buttons.add(num8);buttons.add(num7);buttons.add(plu);buttons.add(num6);buttons.add(num5);buttons.add(num4);buttons.add(min);buttons.add(num3);buttons.add(num2);buttons.add(num1);buttons.add(mul);buttons.add(num0);buttons.add(cle);buttons.add(equ);buttons.add(div);buttons.add(zuok);buttons.add(youk);buttons.add(dian);buttons.add(NULL);(num9).addActionListener(this); (num8).addActionListener(this); (num7).addActionListener(this); (num6).addActionListener(this); (num5).addActionListener(this);(num4).addActionListener(this);(num3).addActionListener(this);(num2).addActionListener(this);(num1).addActionListener(this);(num0).addActionListener(this);(plu).addActionListener(this);(min).addActionListener(this);(mul).addActionListener(this);(div).addActionListener(this);(equ).addActionListener(this);(cle).addActionListener(this);(zuok).addActionListener(this); (youk).addActionListener(this);(dian).addActionListener(this);setLayout(new BorderLayout());add("North",text);add("South",buttons);space.setText("0");}public void actionPerformed(ActionEvent e) {if(e.getSource()==num9){if(i==true){space.setText("9");i=false;}else space.setText(space.getText()+'9'); }if(e.getSource()==num8){if(i==true){space.setText("8");i=false;}else space.setText(space.getText()+'8'); }if(e.getSource()==num7){if(i==true){space.setText("7");i=false;}else space.setText(space.getText()+'7'); }if(e.getSource()==num6){if(i==true){space.setText("6");i=false;}else space.setText(space.getText()+'6'); }if(e.getSource()==num5){if(i==true){space.setText("5");i=false;}else space.setText(space.getText()+'5'); }if(e.getSource()==num4){if(i==true){space.setText("4");i=false;}else space.setText(space.getText()+'4'); }if(e.getSource()==num3){if(i==true){space.setText("3");i=false;}else space.setText(space.getText()+'3'); }if(e.getSource()==num2){if(i==true){space.setText("2");i=false;}else space.setText(space.getText()+'2'); }if(e.getSource()==num1){if(i==true){space.setText("1");i=false;}else space.setText(space.getText()+'1'); }if(e.getSource()==num0){if(i==true){space.setText("0");i=false;}else space.setText(space.getText()+'0');if(e.getSource()==zuok){if(i==true){space.setText("(");i=false;}else space.setText(space.getText()+'('); }if(e.getSource()==youk){if(i==false)space.setText(space.getText()+')');}if(e.getSource()==dian){if(i==false)space.setText(space.getText()+'.');}if(e.getSource()==plu)space.setText(space.getText()+'+');i=false;}if(e.getSource()==min){space.setText(space.getText()+'-');i=false;}if(e.getSource()==mul){space.setText(space.getText()+'*');i=false;}if(e.getSource()==div){space.setText(space.getText()+'/');i=false;}if(e.getSource()==equ){space.setText(String.valueOf(Calculator(space.getText())));}if(e.getSource()==cle){space.setText("0");i=true;}}public double Calculator(String f)//科学计算{int i=0,j=0,k;char c;StringBuffer s=new StringBuffer();s.append(f);s.append('=');String formula=s.toString();char[] anArray;anArray=new char[50];Stack<Character> mystack=new Stack<Character>(); while(formula.charAt(i)!='='){c=formula.charAt(i);{case '(': mystack.push(new Character(c));i++;break;case ')':while(mystack.peek().charValue()!='('){anArray[j++]=mystack.pop().charValue();}mystack.pop();i++;break;case '+':case '-':while(!mystack.empty()&&mystack.peek().charValue()!='(') {anArray[j++]=mystack.pop().charValue();}mystack.push(new Character(c));i++;break;case '/':while(!mystack.empty()&&(mystack.peek().charValue()=='*'||mystack.peek().c harValue()=='/')){anArray[j++]=mystack.pop().charValue();}mystack.push(new Character(c));i++;break;case' ': i++;break;default: while((c>='0'&&c<='9')||c=='.'){anArray[j++]=c;i++;c=formula.charAt(i);}anArray[j++]='#';break;}}while(!(mystack.empty()))anArray[j++]=mystack.pop().charValue();i=0;int count;double a,b,d;Stack<Double> mystack1 =new Stack<Double>(); while(i<j){c=anArray[i];switch(c){case '+':a=mystack1.pop().doubleValue();b=mystack1.pop().doubleValue();d=b+a;mystack1.push(new Double(d));i++;break;case '-':a=mystack1.pop().doubleValue();b=mystack1.pop().doubleValue();d=b-a;mystack1.push(new Double(d)); i++;break;case '*':a=mystack1.pop().doubleValue(); b=mystack1.pop().doubleValue(); d=b*a;mystack1.push(new Double(d)); i++;break;case '/':a=mystack1.pop().doubleValue(); b=mystack1.pop().doubleValue(); if(a!=0){d=b/a;mystack1.push(new Double(d)); i++;}else{System.out.println("Error!");}break;default:d=0;count=0;while((c>='0'&&c<='9')){d=10*d+c-'0';i++;c=anArray[i];}if(c=='.'){i++;c=anArray[i];while((c>='0'&&c<='9')){count++;d=d+(c-'0')/Math.pow(10,count); i++;c=anArray[i];}}if(c=='#')mystack1.push(new Double(d));i++;break;}}return(mystack1.peek().doubleValue());}}建立Calucator.html<html><applet code=Calucator.class width=400 height=180> </applet></html>设计结果与分析(可以加页)：本实验是对巩固与复习，运用了AWT和Swing组件，利用容器和事件接听器对按钮的接听，并将程序运行于浏览器以便更方便被用户运用。
