西南科技大学JAVA实验四实验报告

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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(jPanel1Layout);jPanel1Layout.setHorizontalGroup

8、(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);jCheckBox2.setText(jCheckBox2);jCheckBox2.addActionL

9、istener(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.awt.Cursor.DEFAULT_CURSOR);txtText.setFont(new java.awt.Font

10、(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(java.awt.event.ActionEvent evt) );fileMenu.setText(u67e5u770b);openMenuItem.setText(Op

11、en);fileMenu.add(openMenuItem);saveMenuItem.setText(Save);fileMenu.add(saveMenuItem);saveAsMenuItem.setText(Save As .);fileMenu.add(saveAsMenuItem);exitMenuItem.setText(Exit);exitMenuItem.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt

12、) exitMenuItemActionPerformed(evt););fileMenu.add(exitMenuItem);menuBar.add(fileMenu);helpMenu.setText(Help);contentsMenuItem.setText(Contents);helpMenu.add(contentsMenuItem);aboutMenuItem.setText(About);helpMenu.add(aboutMenuItem);editMenu.setText(Edit);cutMenuItem.setText(Cut);editMenu.add(cutMenu

13、Item);copyMenuItem.setText(Copy);editMenu.add(copyMenuItem);pasteMenuItem.setText(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.GroupLay

14、out(getContentPane();getContentPane().setLayout(layout);layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addContainerGap().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING,false).addGr

15、oup(layout.createSequentialGroup().addComponent(.addGap(21, 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.Grou

16、pLayout.PREFERRED_SIZE).addGap(18, 18, 18).addGroup(layout.createParallelGroup(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_SIZ

17、E,83,javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(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Stri

18、ng s = txtText.getText();/获取屏幕上的字符串int num = Integer.parseInt(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.Act

19、ionEvent evt) /CE按键，实现初始化功能txtText.setText(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;isOperPres

20、sed = true;/清屏private void jButton16ActionPerformed(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();

21、oper=3;elseString s = txtText.getText();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

22、 void jButton31ActionPerformed(java.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

23、出计算结果int number2;String s;isOperPressed = 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.ActionEven

24、t evt) /数字9按键if (!isOperPressed) /原来的数*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.ActionEve

25、nt evt) if (!isOperPressed) 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 = t

26、xtText.getText();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

27、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 = Integer.to

28、String(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);txtText.setText(s); else txt

29、Text.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;pr

30、ivate void jButton24ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 2;s = Integer.toString(num);txtText.setText(s); else txtText.setText(2);isOperPressed = false;private void jButton23MouseClicked(java.aw

31、t.event.MouseEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 1;s = Integer.toString(num);txtText.setText(s); else txtText.setText(1);isOperPressed = false;private void jButton29ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPress

32、ed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 0;s = Integer.toString(num);txtText.setText(s); else txtText.setText(0);isOperPressed = false;private void jCheckBox2ActionPerformed(java.awt.event.ActionEvent evt) private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) /GEN-FIRST:event_exitMenuItemActionPerformedSystem.exit(0);public static void main(String args) java.awt.EventQueue.invokeLater(new Runnable() public void run() new Calculator().setVisible(true););