(完整版)Java复习编程题30

1、第一章：1.编写类College,College中有一个方法init(),显示威海职业学院，编写类School,调用init()方法，在屏幕上显示3行“威海职业学院”。publicclassCollege(publicvoidinit()(System.out.println(威海职业学院);publicclassSchool(publicstaticvoidmain(Stringa)(Collegec1=newCollege();for(inti=0;i3;i+)c1.init();第二章：1、 自定义类Days及其方法dayInmonth()。 该方法的功能是返回用户输入月份的天数(二月份

2、就按28天计算)。例如用户输入3,则该方法将返回值31;用户输入4,则该方法将返回值30。通过main()方法将返回值显示出来。classDaysstaticintdayInmonth(inta)ints=31;switch(a)case2:s=28;break;case4:case6:case9:case11:s=30;returns;publicstaticvoidmain(Stringargs)(inta=Integer.parseInt(args0);intb=dayInmonth(a);System.out.println(a+月有+b+天);第三章：1.编写程序计算12+22+32

3、+42+972+982+992+1002的值，输出classQiuhe(staticintsum=0;publicstaticintcal()(for(inti=1;i=100;i+)(sum+=i*i;returnsum;publicstaticvoidmain(Stringargs)(System.out.println(计算结果为+cal();)2.打印输出10行杨晖三角形classyanghui(publicstaticvoidmain(Stringargs)(inti,j;intyhlevel=10;intyanghui;System.out.println(杨晖三角形:);yang

4、hui=newintyhlevel;for(i=0;iyanghui.length;i+)yanghuii=newinti+1;yanghui00=1;for(i=1;iyanghui.length;i+)(yanghuii0=1;for(j=1;jyanghuii.length-1;j+)yanghuiij=yanghuii-1j-1+yanghuii-1j;yanghuiiyanghuii.length-1=1;for(i=0;iyanghui.length;i+)(for(j=0;jyanghuii.length;j+)System.out.print(yanghuiij+);Syste

5、m.out.println();)输出结果是：杨晖三角形：111121publicclassSelectSort13311464115101051161520156117213535217118285670562881193684126126843691第四章：1.白定义一数组并对数组中每个元素赋值，然后按逆序输出.2.编写一个程序用选择法对数组a=20,10,50,40,30,70,60,80,90,100进行由大到小的排序。importjava.io.*;publicclassArrayTestpublicstaticvoidmain(Stringargs)inti;inta=newint

6、5;for(i=0;i=0;i-)System.out.println(a+i+=ai);publicclassSelectSort2.importjava.io.*;publicstaticvoidmain(Stringargs)(inta=20,10,50,40,30,70,60,80,90,100;inttemp;for(inti=0;ia.length-1;i+)for(intj=i+1;ja.length;j+)if(aiaj)temp=ai;ai=aj;aj=temp;for(intk=0;ka.length;k+)System.out.println(a+k+:+ak);第五章：

7、1.设计一个长方形类，成员变量包括长和宽。类中有计算面积和周长的方法，并有相应的set方法和get方法设置和获得长和宽。编写测试类测试是否达到预定功能。要求使用自定义的包。2.设计雇员Employee类，记录雇员的情况，包括姓名、年薪、受雇时间，要求定义MyDate类作为受雇时间，其中包括工作的年、月、日，并用相应的方法对Employee类进行设置。编写测试类测试Employee类.要求使用自己的包。3根据下面的要求编程实现复数类ComplexNumbeG(1)复数类ComplexNumber的属性-m_dRealPart实部，代表复数的实数部分。-m_dlmaginPart虚部，代表复数的虚

8、数部分。复数类ComplexNumber的方法ComplexNumber(构造方法，将实部、虚部都置为0。-ComplexNumber(doubler,doublei)构造方法，创建复数对象的同时完成复数的实部、虚部的初始化；r为实部的初值，i为虚部的初值。-getRealPart()获得复数对象的实部。-getlmaginaryPart()获得复数对象的虚部。-setRealPart(doubled)把当前复数对象的实部设置为给定的形参的数字。-setlmaginaryPart(doubled)把当前复数对象的虚部设置为给定形参的数字。-complexAdd(ComplexNumberc肖前

9、复数对象与形参复数对象相加，所得的结果也是复数值，返回给此方法的调用者。-complexAdd(doublec)当前复数对象与形参实数对象相加，所得的结果仍是复数值，返回给此方法的调用者。-complexMinus(ComplexNumberc)当前复数对象与形参复数对象相减， 所得的结果也是复数值， 返回给此方法的调用者。1。packagemypackage.math;classRectangleprivateintlength;privateintwidth;publicRectangle(intlength,intwidth)this.length=length;this.width=w

10、idth;publicvoidset(intlength,intwidth)this.length=length;this.width=width;publicvoidget()(System.out.println(此长方形的长为+length+宽为+width);publicintgetLength()(returnlength;publicintgetWidth()(returnwidth;publicintcalculatePerimeter()return2*(length+width);publicintcalculateArea()return(length*width);pub

11、licvoidprint()System.out.println(此长方形的周长为+calculatePerimeter()+面积为+calculateArea();classTestpublicstaticvoidmain(Stringargs)publicclassEmployeeRectanglemyrectangle=newRectangle(15,10);myrectangle.get();myrectangle.print();myrectangle.set(20,15);System.out.println(长方形的长是+myrectangle.getLength()+宽是”+m

12、yrectangle.getWidth();myrectangle.print();2.packagemypackage.employee;classMyDateprivateintyear;privateintmonth;privateintday;publicMyDate(intyear,intmonth,intday)this.year=year;this.month=month;this.day=day;publicintgetYear()returnyear;3publicclassch5_e5_12privateStringname;privatedoublesalary;priv

13、ateMyDatehireDay;publicEmployee(Stringname,doublesalary,MyDateday)=name;this.salary=salary;hireDay=day;publicvoidprint()System.out.println(name+salary+hireYear();publicinthireYear()returnhireDay.getYear();classTestEmployeepublicstaticvoidmain(Stringargs)Employeea=newEmployee(李明”,20000,newMy

14、Date(2000,10,1);Employeeb=newEmployee(王强,24000,newMyDate(1995,8,12);a.print();b.print();3publicclassch5_e5_12publicstaticvoidmain(Stringargs)(ComplexNumbercNumber_1=newComplexNumber(3,-5);ComplexNumbercNumber_2=newComplexNumber(2,2);doubled=10.0;System.out.println(cNumber_1.toString()+”加+cNumber_2.t

15、oString()+等于+cNumber_plexAdd(cNumber_2).toString();System.out.println(cNumber_1.toString()+加+d+等于”+cNumber_plexAdd(d).toString();System.out.println(cNumber_1.toString()+减+cNumber_2.toString()+等于+cNumber_plexMinus(cNumber_2).toString();System.out.println(cNumber_1.toString()+减+d+等于”+cNumber_plexMinus

16、(d).toString();System.out.println(cNumber_1.toString()+乘+cNumber_2.toString()+等于+cNumber_plexMulti(cNumber_2).toString();System.out.println(cNumber_1.toString()+乘+cNumber_plexMulti(d).toString();)classComplexNumber/域privatedoublem_dRealPart;privatedoublem_dImaginPart;/构造方法ComplexNumber()m_dRealPart=

17、0.0;m_dImaginPart=0.0;)ComplexNumber(doubler,doublei)m_dRealPart=r;m_dImaginPart=i;)ComplexNumber(ComplexNumberc)m_dRealPart=c.getRealPart();m_dImaginPart=c.getImaginaryPart();/get,set方法doublegetRealPart()(returnm_dRealPart;)doublegetImaginaryPart()(returnm_dImaginPart;)voidsetRealPart(doubled)(m_dR

18、ealPart=d;)voidsetImaginaryPart(doubled)(m_dImaginPart=d;)/复数运算方法ComplexNumbercomplexAdd(ComplexNumberc)()returnnewComplexNumber(this.m_dRealPart+c.getRealPart(),this.m_dImaginPart+c.getImaginaryPart();ComplexNumbercomplexAdd(doublec)(returnnewComplexNumber(this.m_dRealPart+c,this.m_dImaginPart);)Co

19、mplexNumbercomplexMinus(ComplexNumberc)(returnnewComplexNumber(this.m_dRealPart-c.getRealPart(),this.m_dImaginPart-c.getImaginaryPart();)ComplexNumbercomplexMinus(doublec)(returnnewComplexNumber(this.m_dRealPart-c,this.m_dImaginPart);)ComplexNumbercomplexMulti(ComplexNumberc)(returnnewComplexNumber(

20、this.m_dRealPart*c.getRealPart()-this.m_dImaginPart*c.getImaginaryPart(),this.m_dRealPart*c.getImaginaryPart()+this.m_dImaginPart*c.getRealPart();ComplexNumbercomplexMulti(doublec)(returnnewComplexNumber(this.m_dRealPart*c,this.m_dImaginPart*c);)/toString()publicStringtoString()(return(+m_dRealPart+

21、m_dImaginPart+i+);)弟八早：1.有三个字符串，编写程序找出其中最大者。2.编写一个程序，设定一个有大小写字母的字符串，先将字符串的大写字符输出，再将字符串中的小写字符输出。3.设定5个字符串，要求只打印那些以字母“b”开头的串，编写程序完成。4.设定一个有大小写字母的字符串和一个查找字符，使用类String方法IndexOf()来判断在该字符串中该字符出现的次数。1.publicclassmax1publicstaticvoidmain(Stringargs)(Strings1=HelloJava;Strings2=JavaApplet;Strings3=Java;Strin

22、gs;if(pareTo(s2)0)s=s2;elses=s1;if(pareTo(s3)0)s=s3;Systrm.out.println(big=+s);2.publicclassout(publicstaticvoidmain(Stringargs)(Strings1=HelloJava;StringBufferbufup=newStringBuffer();StringBufferbuflow=newStringBuffer();for(intI=0;Is1.length();I+)if(s1.charAt(i)97)bufup.append(s1.charAt(i);bufup.ap

23、pend();elsebuflow.append(s1.charAt(i);buflow.append();System.out.println(s1=+s1);System.out.println(uppercase=+bufup);System.out.println(lowercase=+buflow);3.publicclassprin_bpublicstaticvoidmain(Stringargs)Strings1=hello;Strings2=bee”;Strings3=java;Strings4=brove”;Strings5=bag”;if(s1.indexOf(b)=0)S

24、ystem.out.println(s1);if(s2.indexOf(b)=0)System.out.println(s2);if(s3.indexOf(b)=0)System.out.println(s3);if(s4.indexOf(b)=0)System.out.println(s4);if(s5.indexOf(b)=0)System.out.println(s5);4.publicclassppppublicstaticvoidmain(Stringargs)Strings1=abcdefghi;intnum=0;for(inti=0;is1.lastIndexOf(e);i+)i

25、=s1.indexof(e,i);num+;System.out.print(s1=+s1+e=);if(num=0)System.out.println(nofound);elseSystem.out.println(num);)第七章：1.编一个应用程序，按行顺序地读取一个可读文件的内容2.使用对象的串行化机制， 使用RandomAccessFile构造一个应用程序能够随机存取文件的记录，可显示、修改记录的内容3.编写一个程序，从键盘输入一串字符，统计这串字符中英文字母、数字、其他符号的字符数。4.编写一个程序，从键盘输入一串字符，从屏幕输出并将其存入a.txt文件中。5.编写一个程序，从

26、键盘输入10个整数，并将这些数据排序后在标准输出上输出。编程第1题importjava.io.*;publicclassReadFilepublicstaticvoidmain(Stringargs)Strings;FileInputStreamis;InputStreamReaderir;BufferedReaderin;tryis=newFileInputStream(bbs.txt);ir=newInputStreamReader(is);in=newBufferedReader(ir);while(s=in.readLine()!=null)System.out.println(Rea

27、d:+s);)catch(FileNotFoundExceptione)System.out.println(Filenotfound!);System.exit(-2);)catch(IOExceptione)System.out.println(Error:+e);System.exit(-3);)elseSystem.out.println(num);)编程第2题importjava.io.*;classDayimplementsSerializable(privateintyear,month,day;publicDay()(year=2000;month=9;day=21;publi

28、cDay(inty,intm,intd)(year=y;month=m;day=d;publicintgetYear()returnyear;publicintgetMonth()returnmonth;publicintgetDay()returnday;publicvoidoutPut()System.out.println(Thedateis:+year+年”+month+月”+day+日);classEmployeeimplementsSerializablepublicstaticfinalintNAMESIZE=40;publicstaticfinalintRECORDSIZE=2

29、*NAMESIZE+8+4*3;privateStringname;privatedoublesalary;privateDayhireDay;publicEmployee()publicEmployee(Stringn,doubles,Dayd)name=n;salary=s;hireDay=d;publicvoidprint()System.out.println(name+salary+hireYear();publicvoidraiseSalary(doublebyPercent)salary*=1+byPercent/100;publicinthireYear()returnhire

30、Day.getYear();publicclassObjectSerpublicstaticvoidmain(Stringargs)throwsIOException,ClassNotFoundExceptioninti;Employeestaff=newEmployee3;staff0=newEmployee(Dong”,600,newDay(1998,9,1);staff1=newEmployee(Wang,1000,newDay(1958,2,15);while(ch=System.in.read()!=r)staff2=newEmployee(Meng,750,newDay(1995,

31、3,15);FileOutputStreamfo=newFileOutputStream(data.txt);ObjectOutputStreamso=newObjectOutputStream(fo);tryfor(i=0;i3;i+)so.writeObject(staffi);so.close();catch(IOExceptione)System.out.println(SavingError:+e);System.exit(1);for(i=0;i3;i+)staffi=null;FileInputStreamfi=newFileInputStream(data.txt);Objec

32、tInputStreamsi=newObjectInputStream(fi);tryfor(i=0;i3;i+)staffi=(Employee)si.readObject();si.close();catch(IOExceptione)System.out.print(ReadingError:+e);System.exit(1);for(i=0;i=A&ch=a&ch=0&ch=9)y+;elsez+;catch(IOExceptione)System.out.println(e.toString();System.out.println(英文字母：+x);Sys

33、tem.out.println(数字字符：+y);System.out.println(其它字符：+z);4.答：importjava.io.*;publicclassInFilepublicstaticvoidmain(Stringargs)intch;tryFileOutputStreamout=newFileOutputStream(a.txt);while(ch=System.in.read()!=r)System.out.write(ch);out.write(ch);)out.close();System.out.write(n);)catch(IOExceptione)(Syst

34、em.out.println(e.toString();)System.out.println(输出至文件完毕！);)5.答：importjava.io.*;publicclassSort(publicstaticvoidmain(Stringargs)(inta=newint10;byteb=newbyte10;intt;Stringstr;System.out.println(请输入10个整数：);try(for(inti=0;i10;i+)(System.out.print(No.+(i+1)+:);System.in.read(b);str=newString(b);str=str.t

35、rim();ai=Integer.parseInt(str);catch(IOExceptione)(System.out.println(e.toString();catch(NumberFormatExceptione)(System.out.println(e.toString();for(inti=0;i9;i+)for(intj=i+1;jaj)t=ai;ai=aj;aj=t;for(inti=0;i10;i+)System.out.println(ai+t);第八章：1.编写一个Applet程序和相应的页面文件，通过页面文件传递参数，在Applet程序中绘制一个长方形（长方形的长度

36、和宽度由页面文件传递）。2.编写一个Applet程序，用来显示与Applet程序在同一文件夹下的图片文件flower.jpg”。3.编写一个Applet程序， 用来循环播放与Applet程序在同一文件夹下的声音文件sound.mid,作为网页的背景音乐。4编写程序，实现如图所示功能：在x和y两个文本框中输入数值，按下右面的任意按钮能进行相应的计算，并将结果显示在中间的文本区中，该区域可以用清除按钮清除。（本题15分）-n|xx+yjf-y清除1.Applet代码如下：importjava.awt.*;importjava.applet.*;publicclassParameterSendext

37、endsAppletintlength,width;publicvoidinit()length=Integer.parseInt(getParameter(Length);width=Integer.parseInt(getParameter(Width);)g.setColor(Color.red);publicvoidpaint(Graphicsg)g.drawRect(10,10,length,width);)HTMLM面代码如下：ParameteSend2.Applet代码如下：importjava.awt.*;importjava.applet.Applet;publicclass

38、ImageAppletextendsAppletImageimage;publicvoidinit()image=getImage(getCodeBase(),flower.jpg);)publicvoidpaint(Graphicsg)(setBackground(Color.lightGray);g.drawString(Thefollowingisaimage,40,20);g.drawImage(image,20,30,150,100,this);)HTMLM面代码如下：3.Applet代码如下：importjava.awt.Graphics;importjava.applet.*;p

39、ublicclassSoundAppletextendsApplet(AudioClipsoundObj;publicvoidinit()(soundObj=getAudioClip(getCodeBase(),sound.mid);)g.drawString(playingaudio,10,40);)publicvoidstart()soundObj.loop();)publicvoidstop()soundObj.stop();)HTMLM面代码如下：4、importjava.awt.*;importjava.awt.event.*;classjisuanqiimplementsActio

40、nListenerFramef=newFrame(计算器);Panelp=newPanel();Panelp1=newPanel();Panelp2=newPanel();Buttonb=newButton(x+y);Buttonb1=newButton(x-y);Buttonb2=newButton(清除);LabQ-bxunewLabe-(-x-xLabQ-byunewLabe-(-y-xTexize-dMxunewTexizle-d(4)； Texize-dMyunewTexizle-d(4)；TexiArea 箪 newTexiArea()；Fonif*-unewFoni(=w=F0n

41、r*B0Lp18)GridLayou*-g_xunewGridLayoui(4-1xGridLayou*-g2unewGridLayoui(2-1xdoub-ex-y-sum-pub=cs 莒 cvoidmain(s5ngUargs)jisuanqijllnewjisuanqo-=go。pub=cvo.dgo()b.seiFonis)；bl.seiFonis)；b2.seiF0ni(ff)；-bx.s2.A=gnmenf(Labe- CENTER)p.setLayout(gl);p.add(lbx);p.add(tfx);p.add(lby);p.add(tfy);f.add(p,West);

42、p1.setLayout(g2);p1.add(b);p1.add(b1);b.addActionListener(this);b1.addActionListener(this);f.add(p1,East);p2.add(b2);b2.addActionListener(this);f.add(p2,South);f.add(ta,Center);f.setSize(250,150);f.setVisible(true);publicvoidactionPerformed(ActionEventae)Strings=ae.getActionCommand();x=Double.parseD

43、ouble(tfx.getText();y=Double.parseDouble(tfy.getText();if(s.equals(x+y)=true)ta.append(x+y=+(x+y)+n);)if(s.equals(x-y)=true)(ta.append(x-y=+(x-y)+n);)if(s.equals(清除)=true)(ta.setText();)第九章：、一、1、创建一个有一个文本区域和三个按钮的程序。当我们按下每个按钮时，使不同的文字显示在文本区域中。2编写程序，创建下面的GUI(不必为各组件提供功能)3.创建下面的GUI,颜色列表框为红色、绿色和蓝色（不必为各组件提

44、供功能）4。编程实现程序菜单功能，用户单击PressMe按钮，在小程序的状态栏上显示ButtonClicked,假设字号为12,字型为常规。5.创建下面的GUI,要求在文本框中输入分数，单击“求和”按钮后在结果文本框中显示总分。6.编写一个将华氏温度转换为摄氏温度的程序。应从键盘输入华氏温度,温度。使用下面的公式进行温度转换：然后通过文本显示转换后的摄氏摄氏温度=5/9X（华氏温度-32）7.编写一个程序，使用户能够使用鼠标在applet中绘制一个矩形。按住鼠标左键，确定矩形的左上角,然后拖动鼠标，在需要的位置（即矩形右下角）释放鼠标。另外，在状态栏中显示矩形面积。编程第1题importjav

45、ax.swing.*;importjava.awt.*;importjava.awt.event.*;importjavax.swing.event.*;classSwingTestextendsJFrameimplementsActionListenerprivateintcount=0;privateJButtonb1=newJButton(英文);privateJButtonb2=newJButton(中文);privateJButtonb3=newJButton(标点);privateJTextAreamytext=newJTextArea(5,20);publicSwingTest(

46、)setTitle(Swing-threeButton-Test);addWindowListener(newWindowAdapter()publicvoidwindowClosing(WindowEvente)System.exit(0););getContentPane().add(b1,BorderLayout.WEST);b1.addActionListener(this);getContentPane().add(b2,BorderLayout.NORTH);b2.addActionListener(this);getContentPane().add(b3,BorderLayou

47、t.SOUTH);b3.addActionListener(this);getContentPane().add(mytext,BorderLayout.CENTER);publicvoidactionPerformed(ActionEvente)Objectob=e.getSource();if(ob=b1)mytext.append(YoutypetheEnglishbutton);elseif(ob=b2)mytext.append(你按了中文按钮)；elseif(ob=b3)mytext.append(,.!);publicstaticvoidmain(Stringargs)JFram

48、ef=newSwingTest();f.setSize(300,300);f.setVisible(true);编程第2题importjava.awt.*;publicclassChp9_3_AextendsFrameTextFieldt=newTextField();Stringop=7,8,9,/,4,5,6,*,1,2,3,-,0,.,=,+;Buttonbtn=newButton16;Panelp=newPanel();publicChp9_3_A()setLayout(newBorderLayout();p.setLayout(newGridLayout(4,4);for(inti=

49、0;iop.length;i+)btni=newButton(opi);p.add(btni);add(t,BorderLayout.NORTH);add(p,BorderLayout.CENTER);setSize(400,300);)publicstaticvoidmain(Stringargs)newChp9_3_A().setVisible(true);)编程第3题importjava.awt.*;publicclassChp9_3_BextendsFrameChoicech;Checkboxbg,fg;ButtonbtnOK,btnCancel;Panelp,p1,p2;public

50、Chp9_3_B()p=newPanel();p.setLayout(newGridLayout(2,1);p1=newPanel();p2=newPanel();p1.setLayout(newFlowLayout();p2.setLayout(newFlowLayout();ch=newChoice();ch.add(红色);ch.add(绿色);ch.add(蓝色);bg=newCheckbox(背景);fg=newCheckbox(前景);pl.add(bg);pl.add(fg);btnOK=newButton(确定);btnCancel=newButton(取消);p2.add(b

51、tnOK);p2.add(btnCancel);p.add(p1);p.add(p2);add(ch,BorderLayout.NORTH);add(p,BorderLayout.CENTER);setSize(400,300);publicstaticvoidmain(Stringargs)newChp9_3_B().setVisible(true);编程第四题：参考程序如下：importjava.awt.*;importjava.awt.event.*;publicclassChp9_3_FextendsFrameprivateTextAreat;publicChp9_3_F()(supe

52、r(菜单示例”)；t=newTextArea(欢迎你进入Java世界);t.setFont(newFont(宋体”,Font.PLAIN,12);add(Center,t);/createMenuBarMenuBarbar=newMenuBar();/createfontMenuMenufontMenu=newMenu(字体);/createthreeMenuItemsMenuItemmi1=newMenuItem(宋体);MenuItemmi2=newMenuItem(黑体);MenuItemmi3=newMenuItem(隶书);/addMenuItemstoMenufontMenu.ad

53、d(mi1);fontMenu.add(mi2);fontMenu.add(mi3);/addMenutoMenuBarbar.add(fontMenu);/settheMenuBarfortheframesetMenuBar(bar);setSize(300,200);setVisible(true);mi1.addActionListener(newActionListener()(publicvoidactionPerformed(ActionEvente)(t.setFont(newFont(宋体”,Font.PLAIN,12););mi2.addActionListener(newA

54、ctionListener()(publicvoidactionPerformed(ActionEvente)(t.setFont(newFont(黑体”,Font.PLAIN,12););mi3.addActionListener(newActionListener()(publicvoidactionPerformed(ActionEvente)(t.setFont(newFont(隶书”,Font.PLAIN,12););publicstaticvoidmain(Stringargs)(newChp9_3_F();运行结果为:字体.双IB你进入丁时&世界5.参考程序如下：impo

55、rtjava.awt.*;importjava.awt.event.*;publicclassChp9_3_CextendsFrameimplementsActionListener(TextFieldtextField1,textField2,textField3;Buttonbutton1=newButton(求和”);Panelpanel1,panel2;publicChp9_3_C()(textField1=newTextField();textField2=newTextField();textField3=newTextField();panel1=newPanel();panel

56、2=newPanel();panel1.setLayout(newGridLayout(3,2);panel2.setLayout(newFlowLayout();panel1.add(newLabel(数学:);panel1.add(textField1);panel1.add(newLabel(英语:);panel1.add(textField2);panel1.add(newLabel(总分：);panel1.add(textField3);panel2.add(button1);add(panel1,BorderLayout.CENTER);add(panel2,BorderLayou

57、t.SOUTH);button1.addActionListener(this);setSize(300,200);setVisible(true);publicstaticvoidmain(Stringargs)newChp9_3_C();publicvoidactionPerformed(ActionEvente)intn1,n2,sum;n1=Integer.parseInt(textField1.getText();n2=Integer.parseInt(textField2.getText();sum=n1+n2;textField3.setText(+sum);运行结果如下:5.参

58、考程序如下：importjava.awt.*;importjava.awt.event.*;publicclassChp9_3_DextendsFrame(TextFieldtextField1,textField2;Buttonbutton1;publicChp9_3_D()(textField1=newTextField(30);textField2=newTextField(30);button1=newButton(转换);setLayout(newFlowLayout();add(newLabel(华氏温度：”)；add(textField1);add(newLabel(摄氏温度：”

59、)；add(textField2);textField2.setEditable(false);add(button1);setSize(400,300);pack();button1.addActionListener(newActionListener()(publicvoidactionPerformed(ActionEvente)(button1_actionPerformed(e););addWindowListener(newWindowAdapter()(publicvoidwindowClosing(WindowEvente)(System.exit(0););publicst

60、aticvoidmain(Stringargs)(newChp9_3_D().setVisible(true);privatevoidbutton1_actionPerformed(ActionEvente)(doubled=Double.parseDouble(textField1.getText();doubleh=5.0/9.0*(d-32);textField2.setText(+h);运行结果如下：6.参考程序如下:importjava.applet.Applet;importjava.awt.*;importjava.awt.event.*;publicclassChp9_3_EextendsAppletimp