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(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;private void jbutton24actionperformed(java.awt.event.actionevent evt) if (!isoperpressed) string s = txttext.gettext();int num = integer