java课程设计计算器的设计与实现

1、淮海工学院计算机工程学院课程设计报告设计名称：面向对象课程设计选题名称：计算器的设计与实现姓名：学号：专业班级：系（院）：计算机工程学院设计时间：设计地点：软件实验室、教室指导教师评语：成绩:签名：年月日1. 课程设计目的及面而对豪思序,讦云说二亓史晦j!很孤而讦算机专亚塞袖谏程两!该讦应!习莞该藻程后行的一次较全面的综合练习。其目的在于通过实践加深学生对面向对象程序设计的理论、方法和基础知识的理解，掌握使用Java语言进行面向对象设计的基本方法，提高运用面向对象知识分析实际问题、解决实际问题的能力。2. 课程设计任务与要求：课程设计可选用NetBeans、Eclipse、JBuilder等作

2、为开发平台以提高开发效率,尽可能熟练掌握其中一种集成开发环境。建议采用UMLB模技术进行系统的分析设计,在Visio中画出系统用例图和类图，并将UMLH复制到设计报告中。通过这次设计，要求掌握以下内容：1）面向对象技术中的继承与多态（重载和覆盖）机制、各种修饰符的使用2）类、包、接口的定义与使用3）常用工具类与算法的实现（数组、向量、字符申、链表）4）Java常用标准GUI组件及其事件处理5）Java的异常处理机制6）Java的数据库连接技术7）Java的多线程技术与动画制作8）Java的网络编程课程设计说明书1、需求分析（用例图）课题：计算器的设计与实现功能分析：此计算器有连续运算的功能，然

3、而在很多人使用计算器时容易忘掉之前是用8*2呢还是6*2,丁是这个计算器多出历史检验的功能，可以将以前的式子显示在下方，一边检验正确与否。2、概要设计MultipleOperation类，用来实现连续运算的类MultipleOperationtrans：String+operation(expr：String)Listl类，用来记录历史的类list3. Str:StringEstr:Stringflag:String+toString()详细设计MultipleOperationtrans：String+operation(expr:String)publicclassMultipleOper

4、ationStringtrans;publicvoidoperation(Stringexpr)ScriptEngineManagermanager=newScriptEngineManager();ScriptEngineengine=manager.getEngineByName("js");trytrans=String.valueOf(engine.eval(expr);catch(Exceptione)trans="错误语法”；System.out.println(e);listStr:StringEstr:Stringflag:String+toStr

5、ing()publicclasslistStringStr;StringEstr;Stringflag;publiclist()(Str=""Estr=""flag=""OverridepublicStringtoString()(/returnA+F+B+D+C;returnStr+"="+Estr;4.编程实现packageCalculator;importjava.awt.event.*;importjavax.swing.*;importjava.util.*;publicclassNewJFrameext

6、endsjavax.swing.JFrame(intClearNumber=1;/判定点击"="后点击数字按钮重置文本框intI=0;/用来加入列表第一行的提示intflag=0;/点击列表后提取结果的判定源judgeju;privatebooleannumber=true;privateStringequalOp="="/privateCalculatorOpop=newCalculatorOp();MultipleOperationCalcuOperation;listhistory;Vector<String>data=newVecto

7、r<String>();/ActionListenernumberListener=newNumberListener();/*classNumberListenerimplementsActionListener(publicvoidactionPerformed(ActionEventevent)(Stringdigit=event.getActionCommand();if(number)(textfield.setText(digit);number=false;else(textfield.setText(textfield.getText()+digit);Action

8、ListeneroperatorListener=newOperatorListener();privatevoidaction()(number=true;textfield.setText("");equalOp="="op.setTotal("0”);*classOperatorListenerimplementsActionListener(publicvoidactionPerformed(ActionEvente)(if(number)(action();textfield.setText("0”);else(number

9、=true;StringdisplayText=textfield.getText();if(equalOp.equals("=")op.A();op.setTotal(displayText);history.D="="*elseif(equalOp.equals("+")op.add(displayText);op.B();history.F="+”;elseif(equalOp.equals("-")op.subtract(displayText);op.B();history.F="-&

10、quot;elseif(equalOp.equals("")xop.multiply(displayText);op.B();history.F=""xelseif(equalOp.equals("")+op.divide(displayText);op.B();history.F=""+elseif(equalOp.equals("AN")op.B();history.F="A"intA;intB;inttrans=1;StringC;A=Integer.parseInt(

11、history.A);B=Integer.parseInt(history.B);op.B();for(inti=0;i<B;i+)(trans*=A;op.power(String.valueOf(trans);textfield.setText(""+op.getTotalString();equalOp=e.getActionCommand();*/publicclassjudge(publicvoidpan()(if(ClearNumber=0)(textfield.setText("");/*publicclassCalculatorOp

12、(*privatedoubletotal;publicCalculatorOp()(total=0;publicStringgetTotalString()(return""+total;publicvoidsetTotal(Stringn)(total=convertToNumber(n);publicvoidadd(Stringn)(total+=convertToNumber(n);publicvoidsubtract(Stringn)(total-=convertToNumber(n);publicvoidmultiply(Stringn)(total*=conve

13、rtToNumber(n);*publicvoiddivide(Stringn)(total/=convertToNumber(n);*publicvoidpower(Stringn)(total=convertToNumber(n);*publicvoidA()(history.A=textfield.getText();publicvoidB()(history.B=textfield.getText();*privatedoubleconvertToNumber(Stringn)(returnDouble.parseDouble(n);*/*CreatesnewformNewJFrame

14、*/publicNewJFrame()(initComponents();history=newlist();textfield.setText(null);CalcuOperation=newMultipleOperation();ju=newjudge();this.setLocationRelativeTo(null);this.setResizable(false);privatevoidbtnPointActionPerformed(java.awt.event.ActionEventevt)(textfield.setText(textfield.getText()+".

15、");privatevoidbtnClearActionPerformed(java.awt.event.ActionEventevt)(textfield.setText(textfield.getText().substring(0,textfield.getText().length()-1);privatevoidbtnEqual1ActionPerformed(java.awt.event.ActionEventevt)(textfield.setText("");privatevoidjButton1ActionPerformed(java.awt.e

16、vent.ActionEventevt)(ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"1”);privatevoidjButton2ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"2");privatevoidjButton3ActionPerformed(java.awt.event.ActionEventevt)(

17、ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"3");privatevoidjButton4ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"4");privatevoidjButton5ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNu

18、mber=1;textfield.setText(textfield.getText()+"5");privatevoidjButton6ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"6");privatevoidjButton7ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNumber=1;textfield

19、.setText(textfield.getText()+"7");privatevoidjButton8ActionPerformed(java.awt.event.ActionEventevt)(ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"8");privatevoidjButton9ActionPerformed(java.awt.event.ActionEventevt)ju.pan();ClearNumber=1;textfield.setText(textfiel

20、d.getText()+"9");privatevoidjButton10ActionPerformed(java.awt.event.ActionEventevt)ju.pan();ClearNumber=1;textfield.setText(textfield.getText()+"0");privatevoidbtnAddActionPerformed(java.awt.event.ActionEventevt)textfield.setText(textfield.getText()+"+");ClearNumber=1;p

21、rivatevoidbtnSubtractActionPerformed(java.awt.event.ActionEventevt)textfield.setText(textfield.getText()+"-");ClearNumber=1;privatevoidbtnMultiplyActionPerformed(java.awt.event.ActionEventevt)ClearNumber=1;textfield.setText(textfield.getText()+"*");privatevoidbtnDivideActionPerfo

22、rmed(java.awt.event.ActionEventevt)textfield.setText(textfield.getText()+"/");ClearNumber=1;privatevoidbtnEqualActionPerformed(java.awt.event.ActionEventevt)/CalcuOperation;Stringstrans=""history.Str=textfield.getText();CalcuOperation.operation(textfield.getText();textfield.setTe

23、xt(CalcuOperation.trans);history.Estr=CalcuOperation.trans;strans=history.Str+"="+history.Estr;if(I=0&&textfield.getText()!=null)data.addElement(”历史记录如下：");I=1;if(CalcuOperation.trans="错误语法")ClearNumber=0;elsedata.addElement(strans);jlist.setListData(data);textfield.

24、setText(CalcuOperation.trans);ClearNumber=0;privatevoidbtnBrackets1ActionPerformed(java.awt.event.ActionEventevt)textfield.setText(textfield.getText()+"(");privatevoidbtnBrackets2ActionPerformed(java.awt.event.ActionEventevt)textfield.setText(textfield.getText()+")");privatevoidj

25、listValueChanged(javax.swing.event.ListSelectionEventevt)history.flag=String.valueOf(jlist.getSelectedValue();textfield.setText(history.flag.substring(history.flag.indexOf("=")+1,history.flag.length();ClearNumber=1;flag=1;privatevoidjButton11ActionPerformed(java.awt.event.ActionEventevt)if

26、(ClearNumber=0|flag=1)Stringa=textfield.getText().substring(0,textfield.getText().indexOf(".");textfield.setText("转换为二进制为："+String.valueOf(Integer.toBinaryString(Integer.parseInt(a);elseif(textfield.getText().indexOf(".”)!=-1)Stringa=textfield.getText().substring(0,textfield

27、.getText().indexOf(".");textfield.setText("转换为二进制为："+String.valueOf(Integer.toBinaryString(Integer.parseInt(a);else(textfield.setText("转换为二进制为："+String.valueOf(Integer.toBinaryString(Integer.parseInt(textfield.getText();ClearNumber=0;privatevoidjButton12ActionPerformed(

28、java.awt.event.ActionEventevt)(if(ClearNumber=0)(Stringa=textfield.getText().substring(0,textfield.getText().indexOf(".");textfield.setText("转换为八进制为："+String.valueOf(Integer.toOctalString(Integer.parseInt(a);else(if(textfield.getText().indexOf(".”)!=-1)Stringa=textfield.getT

29、ext().substring(0,textfield.getText().indexOf(".");textfield.setText("转换为八进制为："+String.valueOf(Integer.toOctalString(Integer.parseInt(a);elsetextfield.setText("转换为八进制为："+String.valueOf(Integer.toOctalString(Integer.parseInt(textfield.getText();ClearNumber=0;privatevoidjButton13ActionPerformed(java.awt.event.ActionEventevt)if(ClearNumber=0)Stringa=textfield.getText().substring(0,textfield.getText().length()-2);textfield.setText("转换为十六进制为："+String.valueOf(Integer.toHexString(In