java语言程序设计基础教程上机实验指导手册

实验 Java环境演③掌握开发JavaApplet程序的3个步骤：编写源文件、编译源文件和运行Java一个简单的应用程实验要求很高兴学习Java”和“Wearestudents”。程序运行效果示程序模板public {publicstaticvoidmain(Stringargs[{【代码1】 //命令行窗口输出"你好，很高兴学习Java"Aa=newA();a}}{

void{【代码2 //命令行窗口输出"Weare}}实验后的练习一个简单的JavaApplet程实验要求编写一个简单的JavaApplet程序，并在JavaApplet中写两行文字：“这是一个JavaApplet程序”和“我改变了字体”。程序运行效果示程序模板importjava.applet.*;importjava.awt.*;publicclassAppletextends{publicvoidpaint(Graphics{序g.setFont(newFont("宋体}}实验后的练习联合编实验要求文件保存到同一中，例如：C:\100，然后编译o.java。程序运行效果示程序模板模板 publicclass{publicstaticvoidmain(Stringargs[{【代码1】 Aa=newA();Bb=newB();}}2publicclass{void{ //命令行窗口输出"Iam}}3publicclass{void{【代码3 //命令行窗口输出"Iam}}4publicclass{void{【代码4 //命令行窗口输出"Iam}}实验后的练习 用如下命令：c:\1000\javac*.java实验 Java基本数据类型与控制语②掌握使用if…elseif输出希腊字母表实验要求程序运行效果示程序模板publicclass{publicstaticvoidmain(Stringargs[{intstartPosition=0,endPosition=0;charcStart='α',cEnd='ω';【代码1 //cStart做int型转换据运算，并将结果赋值给【代码2】 //cEnd做int型转换运算，并将结果赋值给endPositionSystem.out.println("希腊字母\'α\'在unicode表中的顺序位置:"+(int)c);for(int{char【代码3】//i做char型转换运算，并将结果赋值给cSystem.out.print(""+c);}}}实验后的练习floatbyteint回文数实验要求程序运行效果示程序模板importjavax.swing.JOptionPane;publicclassNumber{publicstaticvoidmain(String{intStringstr=JOptionPane.showInputDialog("输入一个199999之间的数");if(【代码1】判断number199999之间的条{ //计算number的最（万位 //计算number的千位【代码4】 //计算number的百位d3if(【代码5】)//判断number5位数{if(【代码6】判断number是回文数的条{}{}}elseif(7】)//判断number4位数的条{if(8】判断number是回文数的{}{}}

elseif(【代码9】)//判断number3位数{if(10】number是回文数{}{}}else{System.out.println(number+"2位数");{}{}}else{}{

System.out.println(number+"1位数");}System.out.printf("\n%d不在199999之间}}}实验后的练习猜数字实验要求程序运行效果示程序模板importjavax.swing.JOptionPane;publicclassGuessNumber{publicstaticvoidmain(Stringargs[{System.out.println("1100之间的整数,请猜测这个数");intrealNumber=(int)(Mathrandom()*100)+1;intStringstr=JOptionPane.showInputDialog("输入您的猜测:");)//{if(【代码2】条件代{}elseif(【代码3】条件代{}}}}实验后的练习}}实验 类与对象、继三角形、梯形和圆形的类封实验要求Trangle类具有类型为doble的三个边，以及周长、面积属性，Trnglerangle程序运行效果示程序模板class{doublesideA,sideB,sideC,area,length;booleanboo;publicTrangle(doublea,doubleb,double{【代码1//参数a,b,c分别赋值给sideA,sideB,sideCif(【代码2】)//a,b,c构成三角形的条件表达式{【代码3//给boo赋值}{【代码4】//给boo赋值}double{【代码5//方法体，要求计算出length}publicdouble{{}{}}

doublep=(sideA+sideB+sideC)/2.0;area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));returnarea;return0;publicvoidsetABC(doublea,doubleb,double{【代码6//参数a,b,c分别赋值给sideA,sideB,sideCif(【代码7】)//a,b,c构成三角形的条件表达式{【代码8//给boo赋值}{}}}

【代码9】//给boo赋值class{doubleabove,bottom,height,area;Lader(doublea,doubleb,doubleh){【代码10】//方法体，将参数a,b,c分别赋值给}double{【代码11//方法体，,要求计算出area返}class{doubleradius,area;Circle(doubler){【代码12//方法}double{【代码13//方法体，要求计算出area返}double{【代码14//getArea方法体的代码,要求计算出length返}voidsetRadius(double{}double{return}}publicclass{publicstaticvoidmain(String{doublelength,area;Circlecircle=null;Trangletrangle;Laderlader;【代码15//创建对象【代码16//创建对象trangle【代码17//创建对象【代码18circle调用方法返回周长并赋值给length【代码19circle调用方法返回面积并赋值给area【代码20trangle调用方法返回周长并赋值给length【代码21trangle调用方法返回面积并赋值给area【代码22lader调用方法返回面积并赋值给area【代码23trangle调用方法设置三个边，要求将三个边修改为12,34,1【代码24trangle调用方法返回面积并赋值给area【代码25trangle调用方法返回周长并赋值给length}}实验后的练习实例成员与类成员实验要求程序运行效果示程序模板{ //一个float型实例变量【代码2】 //一个float型类变量b,即static变量bvoidsetA(floata){【代码3 //将参数a的值赋值给成员变量}voidsetB(float{【代码4 //将参数b的值赋值给成员变量}float{return}float{return}void{}staticvoid{}}publicclass{publicstaticvoidmain(String{【代码5 【代码6】 //通过类名调用方法inputB()Acat=newA();Adog=new //cat象调用方法setA(inta)将cat的成员a的值设置为 //cat调用方法setB(intb)将cat的成员b的值设置为 //dog象调用方法setA(inta)将dog的成员a的值设置为 //dog调用方法setB(intb)将dog的成员b的值设置为 //cat调用inputA() //cat调用inputB() //dog调用inputA() //dog调用inputB()}}实验后的练习使用package语句与import语句实验要求程序运行效果示程序模板字节码文件到c:\1000\tom\jiafei packagepublicclass{doublea,b,c;doubleroot1,root2;booleanboo;publicSquareEquation(doublea,doubleb,double{{}{}}publicvoid{{System.out.println("是一元2次方程");doubledisk=b*b-4*a*c;{}{}

}{}}publicvoidsetCoefficient(doublea,doubleb,double{{}{}}}

2Java源程序SunRise.javad:\2000中。在编译模板E:\jdk1.5。setclasspath的值修importtom.jiafei.*;classSunRise{publicstaticvoidmain(Stringargs[{SquareEquationequation=newSquareEquation(4,5,1);}}实验后的练习 的 D:\5000\tom\jiafei\javacD:\5000\javacjava实验 字符串、时间与数字String类的常用方法实验要求程序运行效果示程序模板class publicstaticvoidmain(String Strings1=newString("youareastudent"),s2=newString("howareyou");if(【代码1】)//使用equals方法判断s1与s2{System.out.println("s1与s2相同}{System.out.println("s1与s2不相同}Strings3=new {}Strings4=newString("你"),if(【代码3】)//按着字典序s4s5的表达式{System.out.println("按字典序s4大于}{System.out.println("按字典序s4小于}intStringposition=【代码5】//获取path中最后出现 System.out.println("c:\\java\\jsp\\A.java中最后出现\\的位置:"+position);StringfileName=【代码6】//获取path中“A.java”子字符串。System.out.println("c:\\java\\jsp\\A.java中含有的文件名:"+fileName);Strings6=newString("100"),s7=newintn1=【代码7】 //将s6转化成int型数据。doublen2=【代码8】//将s7转化成double型数据。doublem=n1+n2;Strings8=【代码9//String调用valuOf(intn)方法mStringSystem.out.println("数字"+m+"有"+temp.length()+"位小数Strings9=newString("ABCDEF");chara[]=【代码10 //将s8存放到数组a中{}}}实验后的练习Strings6=newStringstr1=newString(“ABCABC”),PublicstaticStringtoBinaryString(longi)PublicstaticStringtoOctalString(longi)PublicstaticStringtoHexString(longi)PublicstaticStringtoString(longi,intp)其中的toString(longi,intp)返回整数i的p进制表示。请在适当位置添比较日期的大小实验要求程序运行效果示程序模板importimportjavax.swing.JOptionPane;publicclassDateExample{publicstaticvoidmain(Stringargs[{Stringstr=JOptionPane.showInputDialog("输入第一个日期的年份:");intyearOne=Integer.parseInt(str);intmonthOne=Integer.parseInt(str);intdayOne=Integer.parseInt(str);intyearTwo=Integer.parseInt(str);intmonthTwo=Integer.parseInt(str);intdayTwo=Integer.parseInt(str);Calendarcalendar=【代码1】//【代码2 //将calendar的时间设置为yearOne年monthOnedayOnelongtimeOne=【代码3 【代码4 //将calendar的时间设置为yearTwo年monthTwo Datedate1=【代码6】 //用timeOne做参数构造date1Datedate2=【代码7】 //用timeTwo做参数构造date2{}else{}else{}}}

longdays=【代码8】//计算两个日期相隔天数+yearTwo+"年"+monthTwo+"月"+dayTwo+"相隔"+days+"实验后的练习处理大整实验要求程序运行效果示程序模板importjava.math.*;classBigIntegerExample{publicstaticvoidmain(String BigIntegern1=new n2=newBigInteger(" result=【代码1】//n1n2result=【代码2】//n1n2result=【代码3】//n1n2result=【代码4】//n1n2BigIntegerm=newBigInteger("1968957"),COUNT=newBigInteger("0"),ONE=newBigInteger("1"),TWO=newBigInteger("2"); {{System.out.print("}}}}实验后的练习实验 组件与事件处算术测试实验要求编写一个算书测试小，用来训练小学生的算术能力。程序由3个类组成，其中Teacher类对象负责给出算术题目，并判断回答者的答案是否正确；程序运行效果示程序模板publicclass{intnumberOne,numberTwo;Stringoperator="";booleanright;publicintgiveNumberOne(int{numberOne=(int)(Math.random()*n)+1;returnnumberOne;}publicintgiveNumberTwo(int{numberTwo=(int)(Math.random()*n)+1;returnnumberTwo;}publicString{doubled=Math.random();return}publicbooleangetRight(int{{}elseif(operator.equals("-{if(answer==numberOne-numberTwo)}return}}importjava.awt.*;importjava.awt.event.*;publicclassComputerFrameextendsFrameimplements{TextFieldtextOne,textTwo,textResult;ButtongetProblem,giveAnwser;LabeloperatorLabel,message;Teacherteacher;ComputerFrame(Strings){teacher=newTeacher();setLayout(newFlowLayout());textOne=【代码1】 //创建textOne,其可见字符长是10textTwo=【代码2】 //创建textTwo,其可见字符长是10textResult=【代码3】//创建textResult,其可见字符长是10operatorLabel=newLabel("+");message=newLabel("你还没有回答呢");getProblem=newButton("获取题目");giveAnwser=newButton("确认答案");add(newLabel("="));【代码4】//将当前窗口为getProblem的ActionEvent事件监视【代码5】//将当前窗口为giveAnwser的ActionEvent事件监视【代码6】//将当前窗口为textResult的ActionEvent事件监视addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}}publicvoidactionPerformed(ActionEventif(【代码7】//{intnumber1=teacher.giveNumberOne(100);intnumber2=teacher.giveNumberTwo(100);Stringoperator=teacher.givetOperator();}if(【代码8】//判断事件源是否是{Stringanswer=textResult.getText();intresult=Integer.parseInt(answer);{message.setText}message.setText("你回答错误}}catch(NumberFormatException{message.setText("请输入数字字符}}}}publicclass{publicstaticvoidmain(String{ComputerFrame}}实验后的练习1.信号灯实验要求程序运行效果示程序模板importpublicclassSignalCanvasextends{intred,green,yellow,x,y,r;{}publicvoidsetRed(int }publicvoidsetGreen(int }publicvoidsetYellow(int }publicvoidsetPosition(intx,int{this.x=x;}publicvoidsetRadius(int{}publicvoidpaint(Graphics{{}else{}else{}}}importjava.awt.*;importjava.applet.*;importjava.awt.event.*;publicclassSignalFrameextendsFrameimplements{Choicechoice;SignalCanvassignal=null;StringitemRed="红灯",itemYellow="黄灯",itemGreen="绿灯";publicSignalFrame(){choice=【代码1 //创建【代码2 //创建choice添加【代码3 //创建choice添加【代码4 //创建choice添加【代码5】//将当前窗口为choice的ItemEvent事件监视try{Classcs=Class.forName("SignalCanvas");}catch(Exception Label("您还没有编 addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}}publicvoiditemStateChanged(ItemEvent{Stringitem=【代码6】//choiceintw=signal.getBounds().width;inth=signal.getBounds().height;intm=Math.min(w,h);{{signal.setRed(1);}}else{{signal.setRed(0);}}else{{signal.setRed(0);}}}}publicclass{publicstaticvoidmain(String{SignalFrameframe;frame=newSignalFrame()}}实验后的练习布局与日实验要求pCenterpCenterpCenter中放置49个，用来显示日历。窗口的北面添加一个Panel容器pNorth，其布局是FlowLayout布局，pNorth放置两个按钮：nextMonth和previousMonth，单击显示当前月的上一月的日历。窗口的南面添加一个Panel容器pSouth，其布局是FlowLayout布局，pSouth中放置一个用来显示一些信息。程序运行效果示程序模板importjava.util.Calendar;publicclassCalendarBean{Stringintyear=2005,month=0;publicvoidsetYear(intyear) }publicint return}publicvoidsetMonth(int this}publicint return}publicString[] Stringa[]=newCalendar日历=Calendar.getInstance();intday=0;{}{}{ } }}{a[i]=String.valueOf(n);}return}}importjava.util.*;importjava.awt.*;importjava.awt.event.*;importjava.applet.*;publicclassCalendarFrameextendsFrameimplements LabellabelDay[]=newLabel[42];ButtontitleName[]=newButton[7];","ButtonnextMonth,previousMonth;intyear=2006,month=10;CalendarBeancalendar;LabelshowMessage=newLabel("",Label.CENTER);publicCalendarFrame(){Panel 【代码1//将pCenter的布局设置为77列的GridLayoutfor(int{titleName[i]=new【代码2】//pCenter添加组件titleName[i]}for(int{【代码3】//pCenter添加组件labelDay[i]}calendar=newCalendarBean();月}

for(inti=0;i<42;i++){}nextMonth=newButton("下月");previousMonth=newButton("上月");PanelpNorth=ne "+ScrollPanescrollPane=newScrollPane();【代码4】//窗口添加scrollPane【代码5】//窗口添加pNorth【代码6】//窗口添加pSouth在南publicvoidactionPerformed(ActionEvent{{month=month+1;for(inti=0;i<42;i++){}}else{month=month-1;Stringday[]=calendar.getCalendar();for(inti=0;i<42;i++){}月

showMessage.setText("日历："+calendar.getYear()+"年}}publicclass{publicstaticvoidmain(String CalendarFrameframe=newCalendarFrame(); {}}}}实验后的练习1.CalendarFrame类中增加一个TextField实验 多线汉字打字练习实验要求编写一个Java应用程序，在主线再创建一个Frame类型的窗口，在该窗口程序运行效果示程序模板importpublicclassWordThreadextends charword;intk=19968;Labelcom;WordThread(Label }publicvoid{{try{【代码1】//调用sleep方法使得线断6000豪}catch(InterruptedExceptione){}if(k>=29968)}}}importjava.awt.*;importjava.awt.event.*;publicclassThreadFrameextendsFrameimplements{LabelButtonTextField【代码2】//用WordThread一个giveWord对intscore=0;{wordLabel=newLabel("",Label.CENTER);wordLabel.setFont(newFont("",Font.BOLD,72));button=newButton("开始");inputText=newTextField(3);scoreText=newTextField(5);【代码3】//创建giveWord，将wordLabelWordThread参PanelsouthP=nenel();southP.add(newLabel("输入所显示的汉字后回车:"));addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}}publicvoidactionPerformed(ActionEvent{{if(!(【代码4】 //giveWord调用方法 giveWord=new} }catch(Exception}else{{}}}}publicclass{publicstaticvoidmain(String{new}实验后的练习更改为线断time毫秒。在WordThread类增加publicvoidsetTime(intn)旋转的行实验要求程序运行效果示程序模板importpublicclassMycanvasextends{intColorpublicvoidsetColor(Color{}publicvoidsetR(int{}publicvoidpaint(Graphics{g.setColor(c);}publicint{return}}importpublicclassPlanetextendsPanelimplements{【代码1 //用Thread类一个moon对MycanvasdoublepointX[]=newpointY[]=newdouble[360左上角端点坐标的数组intw=100,h=100;intradius=30;{setSize(w,h);yellowBall=newMycanvas();double for(int {pointX[i+1]=pointX[i]*Math.cos(angle)-Math.sin(angle)*pointY[i];}for(int{pointX[i]=pointX[i]+w/2; }【代码2】moon对}publicvoid{try{moon}catch(Exception}publicvoidpaint(Graphics{g.setColor(Color.blue);}publicvoid{inti=0;{try{【代码3】//Thread类调用类方法sleep使得线断10豪秒}catch(InterruptedException}}}importjava.awt.*;importjava.awt.event.*;publicclassHaveThreadFrameextendsFrameimplements{【代码4 //用Thread类一个rotate对PlanetdoublepointX[]=newdouble[360],pointY[]=newintwidth,height;intradius=120;{rotate=newThread(this);earth=newPlanet();doubleangle=1*Math.PI/180;for(inti=0;i<359;i++){pointX[i+1]=pointX[i]*Math.cos(angle)-Math.sin(angle)*pointY[i];}for(int{pointX[i]=pointX[i]+width/2;}addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}【代码5 }publicvoid{inti=0;{try{Thread.sleep(100);}catch(InterruptedException}}publicvoidpaint(Graphics{g.setColor(Color.red);}}publicclass{publicstaticvoidmain(String{new}}实验后的练习在Salite，线程Salite占有CPU资源期间可以让greenBall画布旋转双线程接实验要求编写一个应用程序，除了主线程外，还有两个线程：和second。程序运行效果示程序模板importjava.awt.*;importjava.awt.event.*;publicclassMoveButtonextendsFrameimplements{【代码1】//用Thread类,second两个线程对ButtonredButton,greenButton,startButton;intdistance=10;{【代码2】//创建线程，当前窗口做为该线程的目标对【代码3】//创建线程，当前窗口做为该线程的目标对redButton=newButton();greenButton=newButton();startButton=newButton("start");addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}}publicvoidactionPerformed(ActionEvent{try{.start();}catch(Exception}publicvoid{{if(【代码4】CPU否是 try{}catch(Exception}if(【代码5】CPU否是 try{Thread.sleep(10);}catch(Exception}}}publicsynchronized ponent(Component{if(Thread.currentThread()== try{wait();}catch(Exceptionexp){}{b.setLocation(10,60);}} try{wait();}catch(Exceptionexp){}{distance=10;}}}}publicclass{publicstaticvoidmain(String{new}实验后的练习实验 输入输出学读汉字实验要求那么在当前应用程序的运行中需要有“你.wav”格式文件。程序运行效果示程序模板importimportjava.util.StringTokenizer;publicclassChineseCharacters{publicStringBuffergetChinesecharacters(File{StringBufferhanzi=newtry{FileReaderinOne=【代码1】//创建指向文件finOne的对象BufferedReaderinTwo=【代码2】//创建指向文inOneinTwoStrings=null;int //inTwo一 StringTokenizertokenizer=newStringTokenizer(s,",'\n'");{}}}catch(Exceptione)return}}importjava.awt.*;importjava.awt.event.*;importjava.io.*;import {ChineseCharacterschinese;Choicechoice;ButtongetCharacters,voiceCharacters;LabelshowCharacters;StringBuffertrainedChinese=null;Clipclip=null;ThreadvoiceThread;intk=0;PanelpCenter;CardLayoutmycard;TextAreatextHelp; ;Itemhelp;publicStudyFrame(){chinese=newChineseCharacters();choice=newChoice();showCharacters=newLabel("",Label.CENTER);showCharacters.setFont(newFont("宋体",Font.BOLD,72));getCharacters=newButton("下一个汉字");voiceCharacters=newButton("发音");voiceThread=newThread(this);PanelpNorth=nenel();pNorth.add(newLabel("选择一个汉字字符组成的文件"));PanelpSouth=nenel();mycard=newCardLayout();textHelp=newTextArea();bar=new=new("帮助help=newItem("关于学汉字"); addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}publicvoiditemStateChanged(ItemEvent{StringfileName=choice.getSelectedItem();Filefile=newFile(fileName);mycard.show(pCenter,"hanzi")}publicvoidactionPerformed(ActionEvent{{{charc=trainedChinese.charAt(k);}showCharacters.setText("请选择一个汉字字符文件}}{{voiceThread=new}try{}catch(Exception

{mycard.show(pCenter,"help")try{FilehelpFile=newFileReaderinOne=【代码4】//创建指向文件helpFileinOneStrings=null;{}}catch(IOException}}publicvoid{voiceCharacters.setEnabled(false);try{if(clip!=null){} }catch(Exceptionexp){}}}publicclass{publicstaticvoidmain(String{new}}实验后的练习previousButton统计英文单词实验要求程序运行效果示程序模板importjava.io.*;importjava.util.Vector;publicclass{VectorallWorsd,noSameWord;{allWorsd=newVector();noSameWord=newVector();}publicvoidwordStatistic(File{try{RandomAccessFileinOne=【代码1 inOne对inTwo

RandomAccessFileinTwo=【代码2 longwordStarPostion=0,wordEndPostion=0;longlength=inOne.length();intflag=1;intc=-1;for(int c=【代码3】 //inOne调用read()方法booleanboo=(c<='Z'&&c>='A')||(c<='z'&&c>='a');{{wordStarPostion=inOne.getFilePointer()-}}{{

【代码4】//inTwo调用seek方法将读写位置移动 【代码5】//inTwo用readFully(byteaa

Stringword=newString(cc);}}}}catch(Exception}publicVector{return}publicVector{return}}importjava.awt.*;importjava.awt.event.*;importjava.util.Vector;importjava.io.File;publicclassStatisticFrameextendsFrameimplements{WordStatisticTextAreashowMessage;ButtonopenFile;FileDialogopenFileDialog;VectorallWord,noSameWord;publicStatisticFrame(){statistic=newWordStatistic();showMessage=newTextArea();openFile=newButton("OpenFile");openFileDialog=newFileDialog(this,"打开文件话框",FileDialog.LOAD);allWord=newVector();noSameWord=newVector();addWindowListener(new{publicvoidwindowClosing(WindowEvent{}}publicvoidactionPerformed(ActionEvent{noSameWord.clear();StringfileName=openFileDialog.getFile(); statistic.wordStatistic(newFile(fileName));单词

showMessage.append("\n其中有"+noSameWord.size()+"个互不相同showMessage.append("\n用频率排列：\n");intcount[]=newint[noSameWord.size()];for(inti=0;i<noSameWord.size();i++){Strings1=(String)noSameWord.elementAt(i);for(intj=0;j<allWord.size();j++) Strings2=(String)allWord.elementAt(j);}}for(int{for(int{{Stringintt=count[m];}}}for(int{}}}}publicclass{publicstaticvoidmain(String{new}}实验后的练习在Zip文件实验要求 程序运行效果示程序模板importimportjava.util.zip.*;publicclass publicstaticvoidmain(String{Filef=newFile("book.zip");Filedir=newFile("Book");byteb[]=newbyte[100];{ZipInputStreamin=newZipInputStream(newFileInputStream(f));ZipEntryzipEntry=null; Filefile=newFile(dir,zipEntry.getName());FileOutputStreamout=newFileOutputStream(file);intn=-1;{Stringstr=newString(b,0,n);}}}catch(IOException{}}}实验后的练习 实验 网络编服务器端文件实验要求创建一个URL对象，然后让URL对象返回输入流，通过该输入流URL所包含程序运行效果示程序模板importjava.awt.*;importjava.awt.event.*;import.*;importjava.io.*;publicclass{publicstaticvoidmain(String{new}}classNetWinextendsFrameimplements{ButtonURLTextFieldTextAreabyteb[]=newbyte[118];Threadthread;{text=newTextField(20);area=newTextArea(12,12);button=newButton("确定");thread=newThread(this);Panelp=nep.add(newLabel("输入:"));addWindowListener(new publicvoidwindowClosing(WindowEvent{}}publicvoidactionPerformed(ActionEvent{thread=newThread(this);}catch(Exception{text.setText("我正在}}publicvoid try intn=-String【代码1】//使用字符串name创建urlStringhostName=【代码2】//urlgetHost()inturlPortNumber=【代码3urlgetPort()StringfileName=【代码4】//urlgetFile()InputStreamin=【代码5url调用方法返回一个输入area.append("\n机:"+hostName+"端口:"+urlPortNumber+area.append("\n Strings=newString(b,0,n);}}catalformedURLException }catch(IOException }}实验后的练习1.publicintgetDefaultPort()、publicStringgetRef()、public使用套接字服务器端对象实验要求程序运行效果示程序模板import.*;importjava.io.*;importjava.awt.*;importjava.awt.event.*;classClientextendsFrameimplements{Buttonconnection;Socketsocket=null;ObjectInputStreamin=null;ObjectOutputStreamout=null;Threadthread;public{socket=newconnection=newButton("连接服务器,文本区对象");thread=newThread(this);addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvent{}}}publicvoid{ try{TextAreatext=(TextArea)in.readObject();}catch(Exception{}}}publicvoidactionPerformed(ActionEvent{{{{}{InetAddressaddress=InetAddress.getByName("");流

【代码2】//socketsocketAddress连innewObjectInputStream(【代码3】//socket入outnewObjectOutputStream4】//socket}}catch(Exception}}publicstaticvoidmain(String Clientwin=new}}importjava.io.*;import.*;importjava.util.*;importjava.awt.*;publicclass{publicstaticvoidmain(String{ServerSocketServerThreadthread;Socketyou=null;{try{server=【代码1】//创建在端口4331上负责的对}catch(IOException{System.out.println("正在}try{you=【代码2server端相连接的Socket}catch(IOException{System.out.println("正在等待客户}{new}else{}}}}classServerThreadextends{Socketsocket;ObjectInputStre