西南科技大学JAVA实验四实验报告

1、面向对象程序设计A（Java）实验报告 实验名称： GUI实验 实验类型： 设计型 指导教师： 刘涌 专业班级： 信安1205 姓 名： 刘追 学 号： 5120155364 实验地点： 东六E501 实验成绩： 日期：2016年11月12日实验四 GUI实验一、实验目的练习Java图形用户界面设计、界面布局、事件设计方法，熟悉GUI 程序设计的基本技术、基本Widget的使用、GUI设计用户接口的方法二、实验内容设计一个类似Windows计算器的Application应用程序三、实验设计1、采用Java Application方式建立应用程序Calculator的框架2、仿照Windows计

2、算器，实现界面设计。将contentPane分成两个jPanel(borderlayout)，其中一个放置文本框，另一个继续划分为两部分，分别以FlowLayout和GridLayout的形式放置按钮。设置按钮、文本框等的Text值及相应属性的修改。3、设计方法：设两个变量value1、value2分别存储运算符左右两个操作数，设置标识符flag,初值为0，此时输入的数传给value1，当按下+-*时设置flag为1，此时输入的数字传给value2；按下”=”时，根据value1，value2及op值进行计算并输出至文本框4、设计方法调节程序bug5、点击事先设计的计算器数字按钮，显示框出现相

3、应数字；点击“+-*/”时，显示框出现相应字符；输入计算式后再输入“=”，显示框出现计算结果，基本实现Windows计算器功能四、实验过程1、采用Java Application方式建立应用程序框架2、仿照Windows计算器，利用多种布局方式实现界面设计 3、组装操作数和运算符，完成简单的整数加、减、乘、除运算4、通过getTxt（）方法来获得显示框txt内容，setTxt（）方法把字符显示在Txt框内；通过Integer.parseInt（String）实现字符串到整型的转换，String.valueOf(Int）实现整型到字符串的转换。5、遇到的问题：显示txt框无法显示两位及以上的数字

4、。解决方法：txt.setTxt(String.valueOf(num*10+btnNum)；把原来的数字*10，再加上要显示的字符并且将整型数字转化为字符串。五、实验结果 运行程序可得到一与Windows计算器界面类似（形式由自己设定的计算器，可实现加、减、乘、除简单数学运算。 六、讨论与分析 1.通过这次实验懂得了GUI的基本设计过程和其实现 2.对java的图形用户界面设计、事件设计方法有了进一步的了解3.学会了制作简单的计算器七、附录：关键代码（给出适当注释，可读性高）public class Calculator extends javax.swing.JFrame public C

5、alculator() initComponents();private void initComponents() /设置主面板按钮menuBar = new javax.swing.JMenuBar();fileMenu = new javax.swing.JMenu();openMenuItem = new javax.swing.JMenuItem();saveMenuItem = new javax.swing.JMenuItem();saveAsMenuItem = new javax.swing.JMenuItem();exitMenuItem = new javax.swing

6、.JMenuItem();helpMenu = new javax.swing.JMenu();contentsMenuItem = new javax.swing.JMenuItem();aboutMenuItem = new javax.swing.JMenuItem();editMenu = new javax.swing.JMenu();cutMenuItem = new javax.swing.JMenuItem();copyMenuItem = new javax.swing.JMenuItem();pasteMenuItem = new javax.swing.JMenuItem

7、();deleteMenuItem = new javax.swing.JMenuItem();jLabel1.setText("jLabel1");jButton1.setText("jButton1");jCheckBox1.setText("jCheckBox1");jButton2.setText("jButton2");javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);jPanel1.setLayout

8、(jPanel1Layout);jPanel1Layout.setHorizontalGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 100,Short.MAX_VALUE);jPanel1Layout.setVerticalGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 100,Short.MAX_VALUE);jChe

9、ckBox2.setText("jCheckBox2");jCheckBox2.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt) jCheckBox2ActionPerformed(evt););setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);setCursor(new java.awt.Cursor(java.

10、awt.Cursor.DEFAULT_CURSOR);txtText.setFont(new java.awt.Font("微软雅黑", 0, 24);txtText.setHorizontalAlignment(javax.swing.JTextField.RIGHT);txtText.setText("0");txtText.setAutoscrolls(false);txtText.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(ja

11、va.awt.event.ActionEvent evt) );fileMenu.setText("u67e5u770b");openMenuItem.setText("Open");fileMenu.add(openMenuItem);saveMenuItem.setText("Save");fileMenu.add(saveMenuItem);saveAsMenuItem.setText("Save As .");fileMenu.add(saveAsMenuItem);exitMenuItem.setText

12、("Exit");exitMenuItem.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt) exitMenuItemActionPerformed(evt););fileMenu.add(exitMenuItem);menuBar.add(fileMenu);helpMenu.setText("Help");contentsMenuItem.setText("Cont

13、ents");helpMenu.add(contentsMenuItem);aboutMenuItem.setText("About");helpMenu.add(aboutMenuItem);editMenu.setText("Edit");cutMenuItem.setText("Cut");editMenu.add(cutMenuItem);copyMenuItem.setText("Copy");editMenu.add(copyMenuItem);pasteMenuItem.setText(&q

14、uot;Paste");editMenu.add(pasteMenuItem);deleteMenuItem.setText("Delete");editMenu.add(deleteMenuItem);helpMenu.add(editMenu);menuBar.add(helpMenu);setJMenuBar(menuBar);javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane();getContentPane().setLayout(layout);layo

15、ut.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addContainerGap().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING,false).addGroup(layout.createSequentialGroup().addComponent(.addGap(21,

16、21, 21);layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(26, 26, 26).addComponent(txtText,javax.swing.GroupLayout.PREFERRED_SIZE,64,javax.swing.GroupLayout.PREFERRED_SIZE).addGap(18, 18, 18).addGroup(layout.c

17、reateParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(/其他按键功能设置已省略jButton26,javax.swing.GroupLayout.PREFERRED_SIZE,38,javax.swing.GroupLayout.PREFERRED_SIZE).addComponent(jButton32,javax.swing.GroupLayout.PREFERRED_SIZE,83,javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap

18、(60,Short.MAX_VALUE);pack();boolean isOperPressed = false;/为true时输入下一个数字时清屏int oper = 0;/1实现加， 2实现减， 3实现乘， 4实现除， 5实现取余int number1 = 0;/参与运算的第一个数字，保存在number1中private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) /按键，实现回退功能String s = txtText.getText();/获取屏幕上的字符串int num = Integer.parseIn

19、t(s);/转换为整形num = num / 10;s = Integer.toString(num);/转换为字符型txtText.setText(s);/显示到屏幕上private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) /C按键，实现清屏功能txtText.setText("0");private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) /CE按键，实现初始化功能txtText.setText("

20、;0");isOperPressed = false;oper = 0;number1 = 0;private void jButton17ActionPerformed(java.awt.event.ActionEvent evt) /取余if(oper !=0)/if else 语句实现连运算 下同dengyu();oper=5;elseString s = txtText.getText();number1 = Integer.parseInt(s);/保存屏幕上的数字oper = 5;isOperPressed = true;/清屏private void jButton16

21、ActionPerformed(java.awt.event.ActionEvent evt) /除if(oper !=0)dengyu();oper=4;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 4;isOperPressed = true;private void jButton21ActionPerformed(java.awt.event.ActionEvent evt) /乘if(oper !=0)dengyu();oper=3;elseString s = txtText.getTex

22、t();number1 = Integer.parseInt(s);oper = 3;isOperPressed = true;private void jButton26ActionPerformed(java.awt.event.ActionEvent evt) /减if(oper !=0)dengyu();oper=2;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 2;isOperPressed = true;private void jButton31ActionPerformed(java.

23、awt.event.ActionEvent evt) /加if(oper !=0)dengyu();oper=1;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 1;isOperPressed = true;private void jButton32ActionPerformed(java.awt.event.ActionEvent evt) / =dengyu();public void dengyu()/等于方法,在屏幕上显示出计算结果int number2;String s;isOperPres

24、sed = true;switch (oper) case 0:break;case 1:number2 = Integer.parseInt(txtText.getText();number1 = number1 + number2;s = Integer.toString(number1);txtText.setText(s);/显示到屏幕上，其他数字输出显示方式同oper = 0;break;private void jButton15ActionPerformed(java.awt.event.ActionEvent evt) /数字9按键if (!isOperPressed) /原来

25、的数*10再加上按上去的数显示到屏幕上String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 9;s = Integer.toString(num);txtText.setText(s); else /点击清屏并显示点击的数字txtText.setText("9");isOperPressed = false;private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPress

26、ed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 8;s = Integer.toString(num);txtText.setText(s); else txtText.setText("8");isOperPressed = false;private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getTe

27、xt();int num = Integer.parseInt(s);num = num * 10 + 7;s = Integer.toString(num);txtText.setText(s); else txtText.setText("7");isOperPressed = false;private void jButton20ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parse

28、Int(s);num = num * 10 + 6;s = Integer.toString(num);txtText.setText(s); else txtText.setText("6");isOperPressed = false;private void jButton19ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 5;s

29、= Integer.toString(num);txtText.setText(s); else txtText.setText("5");isOperPressed = false;private void jButton18ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 4;s = Integer.toString(num);txtT

30、ext.setText(s); else txtText.setText("4");isOperPressed = false;private void jButton25ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 3;s = Integer.toString(num);txtText.setText(s); else txtText.setText("3");isOperPressed = false;private void jButton24ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integ