简单图形界面计算器的设计＿java课程设计报告

1、java 课程设计简单图形界面计算器的设计课程名称 java程序设计 选题名称 简单图形界面计算器的设计 专 业 班 级 姓 名 学 号 指导教师 简单图形界面计算器的设计一、设计任务与目标本次java程序设计我的设计任务是设计一个图形界面（gui）的计算器应用程序并且能够完成简单的算术运算。本次任务的基本要求是这个计算器应用程序可以完成十进制的加、减、乘、除、求倒、取余、开方运算，且有小数点、正负号、退格和清零功能。而我要在此基础上添加一项千位符分隔符的功能，即以三位为一级，在输入的一串数字中每三位加入一个逗号，这项功能国际通用，并已经成为惯例，会计记账都用这种方法便于账目核算与管理。gui

2、计算器设计的具体目标：1. 完成十进制的加、减、乘、除、求倒、取余和开方运算；2. 有小数点和正负号加入运算；3. 有退格、复位和清零的功能；4. 有千位符分隔符的功能，即在输入的一串数字中每三位加入一个逗号。二、方案设计与论证1.设计目标的总体分析（1）设计目标的需求分析：计算器是现在一个普遍应用的工具，能够解决许多人工所无法计算的数据，节省大量宝贵的时间。（2）设计目标的功能分析：实现计算器系统的功能，主要有两个功能模块：输入 和 输出。（3）设计原则：基于计算器系统要具有适用性广、操作简便等特点，本系统预计要达到以下几个目标：满足以上的基本功能要求；能够在常见的计算机及其操作系统上运行。

3、2.设计的基本思路利用gui的界面设计，将整个大设计分为三块，分别是数据的输入，运算符功能符的控制和数据的输入输出显示。利用swing控件，数据的输入由09这10个按钮来表示，用“+”、“-”、“*”、“/”、“1/x”、“%”、“sqrt”这7个按钮来表示加、减、乘、除、求倒、取余、开方运算，用“.”和“”这2个按钮来表示小数点和正负号，用“back”、“ce”和“c”这3个按钮来表示退格、复位和清零的功能，数据的输入输出显示由文本字段来表示。将计算器的总体界面设计好后，再将代码分别写入不同的按钮的源程序中。我要完成的一项改进，即添加一个拥有千位符分隔符功能的按钮，按下这个按钮能够在输入的一

4、串数字中每三位加入一个逗号并且显示出来。我要在之前的界面设计的基础上多添加一个按钮“$”来表示千位符分隔符，并且将功能代码写入这个按钮的源程序中。三、程序流程图，程序清单与调用关系1. 程序流程图：2. 程序清单09数据的输入private void jbutton10actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: if(flag = false&!jtextfield1.gettext().equals(0) jtextfield1.settext(jtextfield1.

5、gettext()+1); else jtextfield1.settext(1); flag = false; “+”号的控制private void jbutton19actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /加号 d1 = double.parsedouble(jtextfield1.gettext(); flag = true; op = +; “-”号的控制private void jbutton18actionperformed(java.awt.even

6、t.actionevent evt) / todo add your handling code here: /减号 d1 = double.parsedouble(jtextfield1.gettext(); flag = true; op = -; “*”号的控制private void jbutton17actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /乘号 d1 = double.parsedouble(jtextfield1.gettext(); flag = tr

7、ue; op = *; “/”号的控制 private void jbutton16actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /除号 d1 = double.parsedouble(jtextfield1.gettext(); flag = true; op = /; “%”取余运算private void jbutton24actionperformed(java.awt.event.actionevent evt) / todo add your handling

8、code here: /求余 d1 = double.parsedouble(jtextfield1.gettext(); flag = true; op = %; “.”号的加入private void jbutton14actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /点号 if(jtextfield1.gettext().equals()|flag = true) jtextfield1.settext(0.); else jtextfield1.settext(jte

9、xtfield1.gettext()+.); flag = false; “”号的加入private void jbutton15actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /正负号 double d = double.parsedouble(jtextfield1.gettext(); d = 0 - d; jtextfield1.settext(+d); “sqrt”开方运算private void jbutton21actionperformed(java.awt.

10、event.actionevent evt) / todo add your handling code here: /开方 double d = double.parsedouble(jtextfield1.gettext(); jtextfield1.settext(+math.sqrt(d); “1/x”求倒数运算private void jbutton22actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /求倒数 double d = double.parsedoubl

11、e(jtextfield1.gettext(); if(d=0) jtextfield1.settext(0); else jtextfield1.settext(+(1/d); “=”等号运算private void jbutton23actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: if(op.equals() return; d2 = double.parsedouble(jtextfield1.gettext(); double result = 0; if(op.eq

12、uals(+) result = d1 + d2; else if(op.equals(-) result = d1 - d2; else if(op.equals(*) result = d1 * d2; else if(op.equals(/) result = d1 / d2; if(d2 = 0) result = 0; else if(op.equals(%) result = d1 % d2; if(d2 = 0) result = 0; jtextfield1.settext(+result); flag = true; “back”退格运算private void jbutto

13、n1actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /if语句判定当前字符串是否为空，若不为空，则将字符串长度减1之后，再赋值给原字符串；否则，将0复制给原字符串。 string s = jtextfield1.gettext(); if(!s.equals() s = s.substring(0,s.length()-1); if(s.equals() s = 0; jtextfield1.settext(s); “ce”复位运算private void jbutton2a

14、ctionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /复位操作 jtextfield1.settext(0); d1 = 0; d2 = 0; op = ; flag = false; “c”清零运算private void jbutton3actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /清零操作 jtextfield1.settext(0); “$”千位符分隔

15、符运算private void jbutton20actionperformed(java.awt.event.actionevent evt) / todo add your handling code here: /千位符分隔符 d1 = double.parsedouble(jtextfield1.gettext(); flag = true; op = $; decimalformat f = new decimalformat(,#); jtextfield1.settext(+f.format(d1); 3. 程序的调用关系图newjframebackcec=$09+-*/%1/x

16、sqrt.四、全部源程序清单/* calculator.java gui简单计算器 */package javacalculator;/* * * author */import java.awt.datatransfer.*;import java.text.decimalformat;public class newjframe extends javax.swing.jframe /* * creates new form newjframe */ public newjframe() initcomponents(); flag = false; d1 = 0; d2 = 0; op

17、= ; jtextfield1.settext(0); clipboard = gettoolkit().getsystemclipboard(); private clipboard clipboard; private boolean flag; private double d1; private double d2; private string op; suppresswarnings(unchecked) / private void initcomponents() jpanel1 = new javax.swing.jpanel(); jpanel2 = new javax.s

18、wing.jpanel(); jbutton4 = new javax.swing.jbutton(); jbutton5 = new javax.swing.jbutton(); jbutton6 = new javax.swing.jbutton(); jbutton7 = new javax.swing.jbutton(); jbutton8 = new javax.swing.jbutton(); jbutton9 = new javax.swing.jbutton(); jbutton10 = new javax.swing.jbutton(); jbutton11 = new ja

19、vax.swing.jbutton(); jbutton12 = new javax.swing.jbutton(); jbutton13 = new javax.swing.jbutton(); jbutton14 = new javax.swing.jbutton(); jbutton15 = new javax.swing.jbutton(); jbutton16 = new javax.swing.jbutton(); jbutton17 = new javax.swing.jbutton(); jbutton18 = new javax.swing.jbutton(); jbutto

20、n19 = new javax.swing.jbutton(); jbutton20 = new javax.swing.jbutton(); jbutton21 = new javax.swing.jbutton(); jbutton22 = new javax.swing.jbutton(); jbutton23 = new javax.swing.jbutton(); jbutton24 = new javax.swing.jbutton(); jtextfield1 = new javax.swing.jtextfield(); jbutton1 = new javax.swing.j

21、button(); jbutton2 = new javax.swing.jbutton(); jbutton3 = new javax.swing.jbutton(); setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close); jbutton4.settext(7); jbutton4.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) j

22、button4actionperformed(evt); ); jbutton5.settext(8); jbutton5.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton5actionperformed(evt); ); jbutton6.settext(9); jbutton6.addactionlistener(new java.awt.event.actionlistener() public

23、void actionperformed(java.awt.event.actionevent evt) jbutton6actionperformed(evt); ); jbutton7.settext(4); jbutton7.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton7actionperformed(evt); ); jbutton8.settext(5); jbutton8.addacti

24、onlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton8actionperformed(evt); ); jbutton9.settext(6); jbutton9.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton9actionpe

25、rformed(evt); ); jbutton10.settext(1); jbutton10.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton10actionperformed(evt); ); jbutton11.settext(2); jbutton11.addactionlistener(new java.awt.event.actionlistener() public void actio

26、nperformed(java.awt.event.actionevent evt) jbutton11actionperformed(evt); ); jbutton12.settext(3); jbutton12.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton12actionperformed(evt); ); jbutton13.settext(0); jbutton13.addactionli

27、stener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton13actionperformed(evt); ); jbutton14.settext(.); jbutton14.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton14actionpe

28、rformed(evt); ); jbutton15.settext(); jbutton15.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton15actionperformed(evt); ); jbutton16.settext(/); jbutton16.addactionlistener(new java.awt.event.actionlistener() public void action

29、performed(java.awt.event.actionevent evt) jbutton16actionperformed(evt); ); jbutton17.settext(*); jbutton17.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton17actionperformed(evt); ); jbutton18.settext(-); jbutton18.addactionlis

30、tener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton18actionperformed(evt); ); jbutton19.settext(+); jbutton19.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton19actionper

31、formed(evt); ); jbutton20.settext($); jbutton20.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton20actionperformed(evt); ); jbutton21.settext(sqrt); jbutton21.addactionlistener(new java.awt.event.actionlistener() public void act

32、ionperformed(java.awt.event.actionevent evt) jbutton21actionperformed(evt); ); jbutton22.settext(1/x); jbutton22.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton22actionperformed(evt); ); jbutton23.settext(=); jbutton23.addacti

33、onlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton23actionperformed(evt); ); jbutton24.settext(%); jbutton24.addactionlistener(new java.awt.event.actionlistener() public void actionperformed(java.awt.event.actionevent evt) jbutton24acti

34、onperformed(evt); ); javax.swing.grouplayout jpanel2layout = new javax.swing.grouplayout(jpanel2); jpanel2.setlayout(jpanel2layout); jpanel2layout.sethorizontalgroup( jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.leading) .addgroup(jpanel2layout.createsequentialgroup() .addgap(

35、53, 53, 53) .addgroup(jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.leading, false) .addcomponent(jbutton20, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value) .addgroup(jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignmen

36、t.trailing, false) .addgroup(jpanel2layout.createsequentialgroup() .addcomponent(jbutton13, javax.swing.grouplayout.preferred_size, 50, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related) .addcomponent(jbutton15, javax.swing.grouplayout.prefer

37、red_size, 49, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related) .addcomponent(jbutton14, javax.swing.grouplayout.preferred_size, 50, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.unrelate

38、d) .addcomponent(jbutton19) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related) .addcomponent(jbutton23, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value) .addgroup(javax.swing.grouplayout.alignment.leading, jpanel2layout.createsequentialgr

39、oup() .addgroup(jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.trailing, false) .addgroup(javax.swing.grouplayout.alignment.leading, jpanel2layout.createsequentialgroup() .addcomponent(jbutton4, javax.swing.grouplayout.preferred_size, 50, javax.swing.grouplayout.preferred_size)

40、.addpreferredgap(javax.swing.layoutstyle.componentplacement.related) .addcomponent(jbutton5, javax.swing.grouplayout.preferred_size, 49, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related, javax.swing.grouplayout.default_size, short.max_value)

41、 .addcomponent(jbutton6, javax.swing.grouplayout.preferred_size, 50, javax.swing.grouplayout.preferred_size) .addgroup(javax.swing.grouplayout.alignment.leading, jpanel2layout.createsequentialgroup() .addgroup(jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.trailing, false) .addcomponent(jbutton10, javax.swing.grouplayout.default_size, 50, short.max_value) .addcomponent(jbutton7, javax.