java课程设计模板(windows计算器)

《JAVA程序设计》课程设计简单计算器姓名：陈凯昂班级：物联网（二）班学号：121210325指导教师：李玮瑶成绩：完成时间：2014.06.12一、设计目的使用Java的GUI图形用户界面编程设计并编写一个计算器程序，用户可以通过鼠标或者键盘操作输入参加运算的的数值和运算符，要求能进行加、减、乘、除等混合运算。二、功能介绍本程序能实现下列各项功能：（1）实现加、减、乘、除等基本运算；（2）实现开方，百分率，倒数等运算；（3）实现退格，清除，存储，读取存储数据等功能。三、概要设计3.1自定义类说明classCalFrameextendsJFrame//自定义子类CalFrame继承于父类JFrame；classCalService//计算器计算方法；classMyMath//算数进度运算；publicclassCal//主类；3.2方法定义说明privatefinalString[]...//定义按键字符privatefinalJButtonbutton//定义按键privateJPanelpanel//定义面板privateJTextField//定义文本privateJTextArea//定义文本区域privateJButton[]//定义按键组publicvoidinitialize()//初始化计算器界面publicActionListenergetActionListener()//设置侦听器publicvoidactionPerformed(finalActionEvente)//设置动作事件privateJTextFieldgetTextField()//初始化输入框privateJButton[]getMButton()//获取计算器的存储区显示等按键privateJButton[]getRButton()//获得计算器的退格清零等按键privateJButton[]getNButton()//获得计算器的加减乘除等其他按键publicvoidsetTextArea(JTextAreatextArea)//设置文本区域publicStringcallMethod(Stringcmd,Stringtext)//调用该方法并返回计算结果publicStringcal(Stringtext,booleanisPercent)//用来结算加、减、乘、除法，并返回封装成String类型的结果，参数text是显示框中的内容，boolean代表是否有“%”运算publicStringsetReciprocal(Stringtext)//计算倒数publicStringsqrt(Stringtext)//开方运算publicStringsetOp(Stringcmd,Stringtext)//设置操作符publicStringsetNegative(Stringtext)//设置正负数，text是正数是返回负数数字字符串，反之，返回正数数字字符串publicStringcatNum(Stringcmd,Stringtext)//连接输入的数字，每次单击数字，都把新加数字追加到后面，并封装成字符串返回publicStringbackSpace(Stringtext)//退后一个字符，并返回结果publicStringmCmd(Stringcmd,Stringtext)//用来实现“M+”“MC”“MR”“MS”等与存储有关的功能publicStringclearAll()//清空所有计算结果publicStringclear(Stringtext)//清除上次计算结果四、详细设计4.1简单计算器界面设计1、具体实现过程本程序采用Calaframe子类继承于父类JFrame,采用BorderLayout边界布局和GridLayout网格布局，将面板添加到里面来布置文本区域以及按键区域。同时，设置监听器ActionListener来实现各个按键的动作功能。2、关键代码设计//导入组件importjava.awt.BorderLayout;importjava.awt.Color;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.math.BigDecimal;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JPanel;importjavax.swing.JTextArea;importjavax.swing.JTextField;importjavax.swing.border.EmptyBorder;//定义继承父类Jframe的子类CalFrameclassCalFrameextendsJFrame{ privatestaticfinallongserialVersionUID=-4043419751779156119L; privatefinalString[]nOp={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};privatefinalString[]mOp={"MC","MR","MS","M+"};privatefinalString[]rOp={"BackSpace","CE","C"};privatefinalStringopString="+-*/";privatefinalJButtonbutton=newJButton();privatefinalCalServiceservice=newCalService();privateJPanelpanel;privateJTextFieldtextField1;privateJTextFieldtextField2;privateJTextAreatextArea;privateJButton[]mButton;privateJPanelpanel1;//显示框放置区privateJPanelpanel2;//按键组m放置区privateJButton[]rButton;privateJPanelpanel3;privateJPanelpanel31;//按键组r放置区privateJButton[]nButton;privateJPanelpanel32;//其他按键放置区publicCalFrame(){super();//访问父类initialize();}publicvoidinitialize()//初始化计算器界面{this.setTitle("计算器by陈凯昂");panel=newJPanel();panel.setLayout(newBorderLayout(10,10));panel1=newJPanel(newBorderLayout());panel1.setBackground(Color.white);getTextField();panel1.add(textField1,BorderLayout.CENTER);panel1.add(textField2,BorderLayout.NORTH);panel2=newJPanel();mButton=getMButton();panel2.setLayout(newGridLayout(5,1,0,5));for(finalJButtonb:mButton)panel2.add(b);panel3=newJPanel();panel3.setLayout(newBorderLayout(0,3));rButton=getRButton();panel31=newJPanel();panel31.setLayout(newGridLayout(1,3,3,0));for(finalJButtonb:rButton)panel31.add(b);nButton=getNButton();panel32=newJPanel();panel32.setLayout(newGridLayout(4,5,3,3));for(finalJButtonb:nButton)panel32.add(b);panel3.add(panel31,BorderLayout.NORTH);panel3.add(panel32);panel.add(panel1,BorderLayout.NORTH);panel.add(panel2,BorderLayout.WEST);panel.add(panel3);this.add(panel);this.setResizable(false);this.setLocationRelativeTo(null);}//设置侦听器publicActionListenergetActionListener(){returnnewActionListener(){publicvoidactionPerformed(finalActionEvente){finalStringcmd=e.getActionCommand();Stringresult=null;try{result=service.callMethod(cmd,textField1.getText());}catch(finalExceptionex){System.out.println(ex.getMessage());}if(opString.indexOf(cmd)!=-1){textField2.setText(textField2.getText()+textField1.getText()+cmd);}elseif(cmd.equals("=")){textField2.setText("");}elseif(cmd.indexOf("MC")==0)button.setText("");elseif(cmd.indexOf("M")==0&&service.getStore()>0)button.setText("M");if(result!=null)textField1.setText(result);}};}//初始化输入框privateJTextFieldgetTextField(){textField1=newJTextField();textField1.setBorder(newEmptyBorder(0,0,0,0));textField1.setText("0");textField1.setHorizontalAlignment(JTextField.RIGHT);textField1.setEditable(false);textField1.setOpaque(false);textField2=newJTextField();textField2.setBorder(newEmptyBorder(0,0,0,0));textField2.setHorizontalAlignment(JTextField.RIGHT);textField2.setEditable(false);textField2.setOpaque(false);returnnull;}//获得计算器的存储显示等按键privateJButton[]getMButton(){finalJButton[]result=newJButton[this.mOp.length+1];result[0]=this.button;for(inti=0;i<this.mOp.length;i++){finalJButtonb=newJButton(this.mOp[i]);b.addActionListener(getActionListener());b.setForeground(Color.black);result[i+1]=b;}returnresult;}//获得计算器的退格清零等按键privateJButton[]getRButton(){finalJButton[]result=newJButton[this.rOp.length];for(inti=0;i<this.rOp.length;i++){finalJButtonb=newJButton(this.rOp[i]);b.addActionListener(getActionListener());b.setForeground(Color.red);result[i]=b;}returnresult;}//获得计算器的加减乘除等其他按键privateJButton[]getNButton(){finalJButton[]result=newJButton[this.nOp.length];for(inti=0;i<this.nOp.length;i++){finalJButtonb=newJButton(this.nOp[i]);b.addActionListener(getActionListener());b.setForeground(Color.blue);result[i]=b;}returnresult;} //设置文本区域publicvoidsetTextArea(JTextAreatextArea) { this.textArea=textArea; } //获得文本区域publicJTextAreagetTextArea() { returntextArea; }}//计算方法classCalService{privatedoublestore;privatebooleanisSecondNum=false;privateStringnumString=".0123456789";privateStringopString="+-*/";privateStringlastOp;privateStringfirstNum="0";privateStringsecondNum;privatebooleanflag=true;publicdoublegetStore(){returnstore;}//调用该方法并返回计算结果publicStringcallMethod(Stringcmd,Stringtext){if(cmd.equals("C"))returnclearAll();elseif(cmd.equals("CE"))returnclear(text);elseif(cmd.equals("BackSpace"))returnbackSpace(text);elseif(numString.indexOf(cmd)!=-1)returncatNum(cmd,text);elseif(opString.indexOf(cmd)!=-1)returnsetOp(cmd,text);elseif(cmd.equals("=")){flag=false;returncal(text,false);}elseif(cmd.equals("+/-"))returnsetNegative(text);elseif(cmd.equals("1/x"))returnsetReciprocal(text);elseif(cmd.equals("sqrt"))returnsqrt(text);elseif(cmd.equals("%"))returncal(text,true);elsereturnmCmd(cmd,text);}publicStringcal(Stringtext,booleanisPercent)//用来结算加、减、乘、除法，并返回封装成String类型的结果，参数text是显示框中的内容，boolean代表是否有“%”运算{doublesecondResult=secondNum==null?Double.valueOf(text).doubleValue():Double.valueOf(secondNum).doubleValue();if(secondResult==0&&this.lastOp.equals("/"))return"0";if(isPercent)firstNum=String.valueOf(MyMath.multiply(Double.valueOf(firstNum),MyMath.divide(secondResult,100)));elseif(this.lastOp.equals("+"))firstNum=String.valueOf(MyMath.add(Double.valueOf(firstNum),secondResult));elseif(this.lastOp.equals("-"))firstNum=String.valueOf(MyMath.subtract(Double.valueOf(firstNum),secondResult));elseif(this.lastOp.equals("*"))firstNum=String.valueOf(MyMath.multiply(Double.valueOf(firstNum),secondResult));elseif(this.lastOp.equals("/"))firstNum=String.valueOf(MyMath.divide(Double.valueOf(firstNum),secondResult));secondNum=null;this.isSecondNum=true;returnfirstNum;}publicStringsetReciprocal(Stringtext)//计算倒数{if(text.equals("0"))returntext;else{this.isSecondNum=true;returnString.valueOf(MyMath.divide(1,Double.valueOf(text)));}}publicStringsqrt(Stringtext)//开方运算{this.isSecondNum=true;returnString.valueOf(Math.sqrt(Double.valueOf(text)));}publicStringsetOp(Stringcmd,Stringtext)//设置操作符{if(!firstNum.equals("0")&&flag)firstNum=cal(text,false);else{this.firstNum=text;this.secondNum=null;this.isSecondNum=true;flag=true;}this.lastOp=cmd;returnfirstNum;}publicStringsetNegative(Stringtext)//设置正负数，text是正数是返回负数数字字符串，反之，返回正数数字字符串{returnString.valueOf(0-Double.valueOf(text));}publicStringcatNum(Stringcmd,Stringtext)//连接输入的数字，每次单击数字，都把新加数字追加到后面，并封装成字符串返回{Stringresult=cmd;if(!text.equals("0")){if(isSecondNum){isSecondNum=false;}else{result=text+cmd;}}if(result.indexOf(".")==0)result="0"+result;returnresult;}publicStringbackSpace(Stringtext)//退后一个字符，并返回结果{return(text.equals("0")||text.equals(""))?"0":text.substring(0,text.length()-1);}publicStringmCmd(Stringcmd,Stringtext)//用来实现“M+”“MC”“MR”“MS”等与存储有关的功能{if(cmd.equals("M+"))//累加结果store=MyMath.add(store,Double.valueOf(text));elseif(cmd.equals("MC"))//清除结果store=0;elseif(cmd.equals("MR"))//读取结果{isSecondNum=true;returnString.valueOf(store);}elseif(cmd.equals("MS"))//保存结果store=Double.valueOf(text).doubleValue();returnnull;}publicStringclearAll()//清空所有计算结果{ this.secondNum=null; this.firstNum="0";returnthis.firstNum;}publicStringclear(Stringtext)//清除上次计算结果{return"0";}}classMyMath{privatestaticBigDecimalgetBigDecimal(doublenumber){returnnewBigDecimal(number);}publicstaticdoubleadd(doublenum1,doublenum2){BigDecimal