西南科技大学JAVA实验四实验报告材料.doc

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1、word面向对象程序设计AJava实验报告实验四 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 程序设计的根本技术、根本Widget的使用、GUI设计用户接口的方法二、实验容设计一个类似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局部，分别以FlowLayout和GridLayout的形式放置按钮。

2、设置按钮、文本框等的Text值与相应属性的修改。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与op值进展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，根本实现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Wi

3、ndows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容，setTxt方法把字符显示在Txt框；通过Integer.parseIntString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框无法显示两位与以上的数字。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

4、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的根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 Calculator() initponents();private void initponents() /设置主面板按钮menuBar = new javax.swing.JMenuBar();fileMenu = new javax.swing.JMenu(

5、);openMenuItem = new javax.swing.JMenuItem();saveMenuItem = new javax.swing.JMenuItem();saveAsMenuItem = new javax.swing.JMenuItem();exitMenuItem = new javax.swing.JMenuItem();helpMenu = new javax.swing.JMenu();contentsMenuItem = new javax.swing.JMenuItem();aboutMenuItem = new javax.swing.JMenuItem(

6、);editMenu = new javax.swing.JMenu();cutMenuItem = new javax.swing.JMenuItem();copyMenuItem = new javax.swing.JMenuItem();pasteMenuItem = new javax.swing.JMenuItem();deleteMenuItem = new javax.swing.JMenuItem();jLabel1.setText(jLabel1);utton1.setText(utton1);jCheckBox1.setText(jCheckBox1);utton2.set

7、Text(utton2);javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);jPanel1.setLayout(jPanel1Layout);jPanel1Layout.setHorizontalGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 100,Short.MAX_VALUE);jPanel1Layout.setVerticalGroup(jPane

8、l1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 100,Short.MAX_VALUE);jCheckBox2.setText(jCheckBox2);jCheckBox2.addActionListener(new java.awt.event.ActionListener() public void actionPerformed(java.awt.event.ActionEvent evt) jCheckBox2ActionPerformed(evt););setDefau

9、ltCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);setCursor(new java.awt.Cursor(java.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.addActionList

10、ener(new java.awt.event.ActionListener() public void actionPerformed(java.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(saveAsMenuIte

11、m);exitMenuItem.setText(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(Contents);h

12、elpMenu.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(Paste);editMenu.add(pasteMenuItem);deleteMenuItem.setText(Delet

13、e);editMenu.add(deleteMenuItem);helpMenu.add(editMenu);menuBar.add(helpMenu);setJMenuBar(menuBar);javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane();getContentPane().setLayout(layout);layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LE

14、ADING).addGroup(layout.createSequentialGroup().addContainerGap().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING,false).addGroup(layout.createSequentialGroup().addponent(.addGap(21, 21, 21);layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Align

15、ment.LEADING).addGroup(layout.createSequentialGroup().addGap(26, 26, 26).addponent(txtText,javax.swing.GroupLayout.PREFERRED_SIZE,64,javax.swing.GroupLayout.PREFERRED_SIZE).addGap(18, 18, 18).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addponent(/其他按键功能设置已省略utton2

16、6,javax.swing.GroupLayout.PREFERRED_SIZE,38,javax.swing.GroupLayout.PREFERRED_SIZE).addponent(utton32,javax.swing.GroupLayout.PREFERRED_SIZE,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，

17、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 utton8ActionPerformed(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.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 utton

18、9ActionPerformed(java.awt.event.ActionEvent evt) /C按键，实现清屏功能txtText.setText(0);private void utton10ActionPerformed(java.awt.event.ActionEvent evt) /CE按键，实现初始化功能txtText.setText(0);isOperPressed = false;oper = 0;number1 = 0;private void utton17ActionPerformed(java.awt.event.ActionEvent evt) /取余if(oper

19、 !=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 utton16ActionPerformed(java.awt.event.ActionEvent evt) /除if(oper !=0)dengyu();oper=4;elseString s = txtText.getText();number1 = Integer.parseI

20、nt(s);oper = 4;isOperPressed = true;private void utton21ActionPerformed(java.awt.event.ActionEvent evt) /乘if(oper !=0)dengyu();oper=3;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 3;isOperPressed = true;private void utton26ActionPerformed(java.awt.event.ActionEvent evt) /减if(

21、oper !=0)dengyu();oper=2;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 2;isOperPressed = true;private void utton31ActionPerformed(java.awt.event.ActionEvent evt) /加if(oper !=0)dengyu();oper=1;elseString s = txtText.getText();number1 = Integer.parseInt(s);oper = 1;isOperPresse

22、d = true;private void utton32ActionPerformed(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;isOperPressed = true;switch (oper) case 0:break;case 1:number2 = Integer.parseInt(txtText.getText();number1 = number1 + number2;s = Integer.toString(numb

23、er1);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 utton15ActionPerformed(java.awt.event.ActionEvent 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); els

24、e /点击清屏并显示点击的数字txtText.setText(9);isOperPressed = false;private void utton14ActionPerformed(java.awt.event.ActionEvent 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);isOperPr

25、essed = false;private void utton13ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.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 utton20ActionPe

26、rformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 6;s = Integer.toString(num);txtText.setText(s); else txtText.setText(6);isOperPressed = false;private void utton19ActionPerformed(java.awt.event.ActionEvent evt) if

27、 (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 5;s = Integer.toString(num);txtText.setText(s); else txtText.setText(5);isOperPressed = false;private void utton18ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getTe

28、xt();int num = Integer.parseInt(s);num = num * 10 + 4;s = Integer.toString(num);txtText.setText(s); else txtText.setText(4);isOperPressed = false;private void utton25ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = n

29、um * 10 + 3;s = Integer.toString(num);txtText.setText(s); else txtText.setText(3);isOperPressed = false;private void utton24ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) String s = txtText.getText();int num = Integer.parseInt(s);num = num * 10 + 2;s = Integer.toString(num);txtT

30、ext.setText(s); else txtText.setText(2);isOperPressed = false;private void utton23MouseClicked(java.awt.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);isOper

31、Pressed = false;private void utton29ActionPerformed(java.awt.event.ActionEvent evt) if (!isOperPressed) 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 jCheckBox2Act

32、ionPerformed(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););19 / 19