简单图形界面计算器的设计＿java课程设计报告.doc

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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) jButton24ActionPerformed(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()