java機(jī)試真題綜述

基本操作題1無題目：importjava.applet.*;//引入Applet類importjava.awt.Graphics;//引入Graphics類

//*********Found********publicclassJava_1extendsApplet{//*********Found********publicvoidpaint(Graphicsg){g.drawString("歡迎你參加Java考試!",25,25);}}基本操作無題目2.publicclassJava_1{//*********Found**********publicstaticvoidmain(_________________args[]){newSimpleThread("第1").start();newSimpleThread("第2").start();}}//*********Found**********classSimpleThreadextends________________{publicSimpleThread(Stringstr){super(str);}publicvoidrun(){for(inti=0;i<5;i++){//*********Found**********System.out.println(i+""+______________());try{sleep((int)(2*100));}catch(InterruptedExceptione){}}System.out.println("運(yùn)行!"+getName());}}基本操作題3.importjavax.swing.JOptionPane;publicclassJava_1{publicstaticvoidmain(Stringargs[]){intx,result;StringxVal;//*********Found**********xVal=JOptionPane.showMessageDialog("輸入第1個(gè)整數(shù):");//*********Found**********x=Integer.parseInt(xVal);result=x*x;//*********Found**********JOptionPane.showMessageDialog(null,"該數(shù)的平方是"+result);System.exit(0);}}基本操作4/Java_1.java，字符串類的startsWith()和endsWith()方法importjavax.swing.*;publicclassJava_1{publicstaticvoidmain(Stringargs[]){Stringstrings[]={"started","starting","ended","ending"};Stringoutput="";//測(cè)試startsWith()方法

for(inti=0;i<strings.length;i++)if(strings[i].startsWith("st"))output+="\""+strings[i]+"\"開始于\"st\"\n";output+="\n";//從字符串第2個(gè)字符開始

for(inti=0;i<strings.length;i++)if(strings[i].startsWith("art",2))output+="\""+strings[i]+"\"開始于\"art\"第2個(gè)字符位置\n";代碼未完，見下一頁(yè)output+="\n";//測(cè)試endsWith()方法

for(inti=0;i<strings.length;i++)//*********Found********if(strings[i].endsWith("____________"))output+="\""+strings[i]+"\"結(jié)束于\"ed\"\n";JOptionPane.showMessageDialog(null,output,"顯示字符串類的比較",//*********Found********JOptionPane._________________________);System.exit(0);}}基本操作5：對(duì)Java-1.java文件進(jìn)行完善并調(diào)試，使程序的輸出結(jié)果如下： 字符串“現(xiàn)在學(xué)習(xí)如何訪問一個(gè)字符串” 字符串長(zhǎng)度為：13

其中第7個(gè)字符是：?jiǎn)?從字節(jié)數(shù)組的第7個(gè)到12獲取字符是：?jiǎn)栆粋€(gè)字符publicclassJava_1{publicstaticvoidmain(Stringargs[]){Stringstring="現(xiàn)在學(xué)習(xí)如何訪問一個(gè)字符串";System.out.println("字符串\""+string+"\"");//*********Found**********System.out.println("字符串長(zhǎng)度："+_________________________);System.out.println("其中第7個(gè)字符是："+string.charAt(7));charsub[]=newchar[20];System.out.print("從字節(jié)數(shù)組的第7到12獲取字符是：");string.getChars(7,12,sub,0);System.out.println(sub);}}基本操作無題目6：importjava.io.*;publicclassJava_1{//*********Found**********publicstaticvoidmain(String[]args)____________Exception{InputStreamReaderir;BufferedReaderin;//*********Found**********ir=newInputStreamReader(____________);in=newBufferedReader(ir);System.out.println("輸入年份是:");Strings=in.readLine();//*********Found**********intyear=Integer.__________________(s);if(year%4==0&&year%100!=0||year%400==0){System.out.println(""+year+"年是閏年.");}else{System.out.println(""+year+"年不是閏年.");}}}基本操作無題目7：//*********Found********import__________________;publicclassJava_1{publicstaticvoidmain(Stringargs[]){Strings1="hashcode",s2="HashCode";Stringoutput="\""+s1+"\"的Hash碼是"+s1.hashCode()+"\n\""+s2+"\"的Hash碼是"+s2.hashCode();JOptionPane.showMessageDialog(null,output,"顯示字符串類的hash碼",//*********Found********JOptionPane.______________________________);System.exit(0);}}基本操作8：importjavax.swing.JOptionPane;publicclassJava_1{publicstaticvoidmain(Stringargs[]){Strings1,s2,s3,s4,output;s1=newString("hello");s2=newString("goodbye");s3=newString("HappyBirthday");s4=newString("happybirthday");output="s1="+s1+"\ns2="+s2+"\ns3="+s3+"\ns4="+s4+"\n\n";//測(cè)試字符串相等

(s1.equals("hello"))//*********Found**********output=output+"s1equals\"hello\"\n";elseoutput=output+"s1doesnotequal\"hello\"\n";//用==測(cè)試相等

if(s1=="hello")output+="s1equals\"hello\"\n";elseoutput+="s1doesnotequal\"hello\"\n";//忽略字符格式測(cè)試相等

if(s3.equalsIgnoreCase(s4))output+="s3equalss4\n";elseoutput+="s3doesnotequals4\n";代碼未完，見下一頁(yè)//內(nèi)容比較

output+="\pareTo(s2)is"+pareTo(s2)+"\pareTo(s1)is"+pareTo(s1)+"\pareTo(s1)is"+pareTo(s1)+"\pareTo(s4)is"+pareTo(s4)+"\pareTo(s3)is"+pareTo(s3)+"\n\n";//測(cè)試包含字符格式的域匹配

if(s3.regionMatches(0,s4,0,5))output+="First5charactersofs3ands4match\n";elseoutput+="First5charactersofs3ands4donotmatch\n";//忽略字符格式的域匹配

if(s3.regionMatches(true,0,s4,0,5))output+="First5charactersofs3ands4match";elseoutput+="First5charactersofs3ands4donotmatch";//*********Found**********JOptionPane.(null,output,"字符串構(gòu)造方法示例",JOptionPane.INFORMATION_MESSAGE);System.exit(0);}}基本操作9：publicclassJava_1{publicstaticvoidmain(Stringargs[]){intx=4;//*********Found**********System.out.println("x的值是："+(x_____________4?9.0:99.99));}}基本操作無題目10：基本操作無題目11：簡(jiǎn)單應(yīng)用無題目1：importjava.io.*;publicclassJava_2{publicstaticvoidmain(String[]args)throwsIOException{FileinputFile;FileoutputFile;FileInputStreamin;FileOutputStreamout;intc;

inputFile=newFile("source.txt");outputFile=newFile("dest.txt");in=newFileInputStream(inputFile);//*********Found********out=newFileOutputStream(outputFile);while((c=in.read())!=-1)//*********Found********breakin;in.close();out.close();}}簡(jiǎn)單應(yīng)用無題目2：importjava.text.*;publicclassJava_2{publicstaticvoidmain(String[]args){Person[]people=newPerson[2];people[0]=newWorker("老張",30000);people[1]=newStudent("小王","計(jì)算機(jī)科學(xué)");for(inti=0;i<people.length;i++){Personp=people[i];//*********Found**********System.out.println(____________________()+","+p.getDescription());}}}//*********Found**********________________classPerson{publicPerson(Stringn){name=n;}//*********Found**********public___________________StringgetDescription();publicStringgetName(){returnname;}privateStringname;}代碼未完，見下一頁(yè)//*********Found**********classWorker_________________Person{publicWorker(Stringn,doubles){super(n);salary=s;}publicStringgetDescription(){NumberFormatformatter=NumberFormat.getCurrencyInstance();return"工人，年薪是"+formatter.format(salary)+"。";}privatedoublesalary;}//*********Found**********classStudent_________________Person{publicStudent(Stringn,Stringm){super(n);major=m;}publicStringgetDescription(){return"學(xué)生，專業(yè)是"+major+"。";}privateStringmajor;}簡(jiǎn)單應(yīng)用3：importjavax.swing.*;publicclassJava_2{publicstaticvoidmain(Stringargs[]){StringBufferbuf=newStringBuffer("你好!祝你成功!");Stringoutput="buf="+buf.toString()+"\nCharacterat0:"+buf.charAt(0)+"\nCharacterat4:"+buf.charAt(4);//*********Found**********charcharArray[]=newchar[buf.length()];//*********Found**********buf.____________________(0,buf.length(),charArray,0);output+="\n\n在字符串緩存中的字符是:";//*********Found**********for(inti=0;i<charArray.length();++i)output+=charArray[i];buf.setCharAt(0,'您');buf.setCharAt(6,'材');output+="\n\nbuf="+buf.toString();//*********Found**********buf.______________________;output+="\n\nbuf="+buf.toString();JOptionPane.showMessageDialog(null,output,"字符串緩存的字符相關(guān)方法示范",JOptionPane.INFORMATION_MESSAGE);System.exit(0);}}簡(jiǎn)單應(yīng)用4：publicclassJava_2{publicstaticvoidmain(Stringargs[]){inti=0;//*********Found********String_____________={"HelloWorld!","Hello!","HELLOWORLD!!"};while(i<4){try{System.out.println(greetings[i]);}//*********Found********_________________(ArrayIndexOutOfBoundsExceptione){//*********Found********System.out.println("Catch"+_____________.getMessage());System.out.println("Endingtheprint.");}finally{System.out.println("---------------------");}//*********Found********_______________;}}}簡(jiǎn)單應(yīng)用5：importjava.io.*;publicclassJava_2{publicstaticvoidmain(String[]args){bytebuf[]=newbyte[5];intlen=0,c1=0,c2=0;//*********Found**********______________________{//*********Found**********FileInputStreamin=_________________________("test.txt");while((len=in.read(buf,0,5))>0){for(inti=0;i<len;i++)if(buf[i]>='0'&&buf[i]<='9'){c1++;}elseif((buf[i]>='a'&&buf[i]<='z')||buf[i]>='A'&&buf[i]<='Z')c2++;if(len<5)break;}//*********Found**********in.______________();}catch(Exceptione){}System.out.println("數(shù)字?jǐn)?shù)是"+c1+"，字母數(shù)是"+c2);}}簡(jiǎn)單應(yīng)用無題目6：importjava.io.File;publicclassJava_2{publicstaticvoidmain(Strings[]){//GettingtheCurrentWorkingDirectoryStringcurDir=System.getProperty("user.dir");System.out.println("當(dāng)前的工作目錄是:"+curDir);

//*********Found**********Fileff=newFile(____________________);String[]files=ff.list();for(inti=0;i<files.length;i++){Stringss=curDir+"\\"+files[i];traverse(0,ss); }}/**遞歸地遍歷目錄樹*@paramlevel目錄的層次*@params當(dāng)前目錄路徑名*/代碼未完，見下一頁(yè)publicstaticvoidtraverse(intlevel,Strings){Filef=newFile(s);for(inti=0;i<level;i++)System.out.print("");if(f.isFile()){System.out.println(f.getName());}elseif(f.isDirectory()){//*********Found**********System.out.println("<"+f._____________________+">");String[]files=f.list();level++;//*********Found**********for(inti=0;i<files.length;________________________){Stringss=s+"\\"+files[i];//*********Found**********traverse(_____________________,ss);}}else{System.out.println("ERROR!");}}}簡(jiǎn)單應(yīng)用無題目7：

//*********Found********publicclassJava_2____________FrameimplementsActionListener{publicstaticvoidmain(Stringargs[]){Java_2fr=newJava_2("Hello!");fr.setLayout(newFlowLayout());fr.setSize(200,100);fr.setBackground(Color.blue);Buttonb=newButton("確定");//*********Found********b._____________________(newJava_2());fr.add(b);fr.setVisible(true);}publicvoidactionPerformed(ActionEvente){System.exit(0);}publicJava_2(Stringstr){super(str);}publicJava_2(){}}簡(jiǎn)單應(yīng)用8：publicclassJava_2{publicstaticvoidmain(Stringargs[]){try{Sleepa=newSleep();Threadt=newThread(a);//*********Found**********t.start();t.join();intj=a.i;System.out.println("j="+j+",a.i="+a.i);}catch(Exceptione){}}}//*********Found**********classSleepimplementsRunnable{inti;publicvoidrun(){try{//*********Found**********Thread.sleep(50);i=10;}catch(InterruptedExceptione){}}}簡(jiǎn)單應(yīng)用9：importjava.awt.*;importjavax.swing.*;//*********Found********publicclassJava_2extends________________{publicvoidinit(){ContainercontentPane=getContentPane();JLabellabel=newJLabel("Java的誕生是對(duì)傳統(tǒng)計(jì)算模式的挑戰(zhàn)！",SwingConstants.CENTER);contentPane.add(label);}}簡(jiǎn)單應(yīng)用無題目10：簡(jiǎn)單應(yīng)用無題目11：代碼未完，見下一頁(yè)綜合運(yùn)用無題目1.importjavax.swing.JOptionPane;publicclassJava_3{publicstaticvoidmain(Stringargs[]){StringfirstNumber,//用戶輸入第1個(gè)字符串

secondNumber,//用戶輸入第2個(gè)字符串

result;//astringcontainingtheoutputintnumber1,//比較的第1個(gè)數(shù)

number2;//比較的第2個(gè)數(shù)

//讀用戶輸入的第1個(gè)字符串readfirstnumberfromuserasastringfirstNumber=JOptionPane.showInputDialog("Enterfirstinteger:");//讀用戶輸入的第2個(gè)字符串readsecondnumberfromuserasastringsecondNumber=JOptionPane.showInputDialog("Entersecondinteger:");//將字符串類型轉(zhuǎn)換成整數(shù)類型

number1=Integer.parseInt(firstNumber);number2=Integer.parseInt(secondNumber);result="";

代碼未完，見下一頁(yè)//*********Found********if(number1==number2)//本行有錯(cuò)需修改

result=number1+"=="+number2;if(number1!=number2)result=number1+"!="+number2;if(number1<number2)result=result+"\n"+number1+"<"+number2;if(number1>number2)result=result+"\n"+number1+">"+number2;if(number1<=number2)result=result+"\n"+number1+"<="+number2;//*********Found********if(number1>=number2)//本行有錯(cuò)需修改

result=result+"\n"+number1+">="+number2;//顯示結(jié)果

//*********Found********JOptionPane.showMessageDialog(null,result,"ComparisonResults",//*********Found********Font.INFORMATION_MESSAGE);//程序正常退出

//*********Found********System.exit(0);}}/*JOptionPane類的常用靜態(tài)方法如下：

showInputDialog()showConfirmDialog()showMessageDialog()showOptionDialog()*/綜合運(yùn)用無題目2.importjava.awt.*;importjava.awt.event.*;importjava.io.*;importjavax.swing.*;publicclassJava_3{publicstaticvoidmain(String[]args){JFrameframe=newImageViewerFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}classImageViewerFrameextendsJFrame{publicImageViewerFrame(){setTitle("ImageViewer");setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);label=newJLabel();ContainercontentPane=getContentPane();contentPane.add(label,BorderLayout.CENTER);chooser=newJFileChooser();chooser.setCurrentDirectory(newFile("."));JMenuBarmenuBar=newJMenuBar();setJMenuBar(menuBar);JMenumenu=newJMenu("File");menuBar.add(menu);JMenuItemopenItem=newJMenuItem("Open");

代碼未完，見下一頁(yè)//*********Found**********_______________.add(openItem);//*********Found**********openItem.___________________________(newActionListener(){publicvoidactionPerformed(ActionEventevt){intr=chooser.showOpenDialog(null);if(r==JFileChooser.APPROVE_OPTION){//*********Found**********Stringname=__________________.getSelectedFile().getPath();label.setIcon(newImageIcon(name));}}});labelT=newJLabel("紅軍不怕遠(yuǎn)征難");labelT.setFont(newFont("隸書",Font.PLAIN,DEFAULT_SIZE));contentPane.add(labelT,BorderLayout.NORTH);faceCombo=newJComboBox();faceCombo.setEditable(true);faceCombo.addItem("隸書");faceCombo.addItem("華文新魏");faceCombo.addItem("華文行楷");faceCombo.addItem("華文隸書");

代碼未完，見下一頁(yè)//*********Found**********faceCombo.________________________(newActionListener(){publicvoidactionPerformed(ActionEventevent){//*********Found**********labelT.setFont(newFont((String)____________________.getSelectedItem(),Font.PLAIN,DEFAULT_SIZE));}});JPanelcomboPanel=newJPanel();comboPanel.add(faceCombo);contentPane.add(comboPanel,BorderLayout.SOUTH);}privateJLabellabel;privateJLabellabelT;privateJFileChooserchooser;privateJComboBoxfaceCombo;privatestaticfinalintDEFAULT_SIZE=24;publicstaticfinalintDEFAULT_WIDTH=570;publicstaticfinalintDEFAULT_HEIGHT=400;}綜合運(yùn)用3.//Java_3.java:二分法檢索算法importjava.util.*;publicclassJava_3{privateStringcolors[]={“紅”,“白”,“藍(lán)“,"黑","黃","紫","茶色","粉紅"};privateArrayListaList;//ArrayList引用

publicJava_3(){aList=newArrayList(Arrays.asList(colors));Collections.sort(aList);//ArrayList分類

System.out.println("對(duì)ArrayList分類:"+aList);}publicvoidprintSearchResults(){printSearchResultsHelper(colors[3]);//首項(xiàng)

printSearchResultsHelper(colors[0]);//中間項(xiàng)

printSearchResultsHelper(colors[7]);//最后項(xiàng)

printSearchResultsHelper("綠");//最低

printSearchResultsHelper("灰");//不存在

//*********Found********printSearchResultsHelper("____________");//不存在

}privatevoidprintSearchResultsHelper(Stringkey){intresult=0;System.out.println("\n檢索關(guān)鍵字:"+key);result=Collections.binarySearch(aList,key);System.out.println((result>=0?"找到下標(biāo)"+result:"沒有找到("+result+")"));}publicstaticvoidmain(Stringargs[]){//*********Found********newJava_3().____________________________;}}綜合運(yùn)用4//程序的功能是，判斷用戶以命令行方式鍵盤輸入的路徑類名是否在Java類庫(kù)中。publicclassJava_3{publicstaticvoidmain(String[]args){StringclassName;if(args.length>0)className=args[0];elseclassName="java.lang.Name";//*********Found********____________//*********Found********{Classc=Class.forName(_______________);System.out.println(className+"是Java類庫(kù)中已有的類。");}//*********Found********catch(ClassNotFound_______________e){System.out.println(className+"不在Java類庫(kù)中。");}}}綜合運(yùn)用5importjava.io.*;publicclassJava_3{publicstaticintdata[]={32,18,41,23,2,56,36,67,59,20};publicstaticvoidmain(Stringargs[]){inti;//*********Found**********intindex=data.__________________;System.out.println("排序前:");for(i=0;i<index;i++)System.out.print(""+data[i]+"");System.out.println();//*********Found**********BubbleSort(_________________);System.out.println("排序后:");for(i=0;i<index;i++)System.out.print(""+data[i]+"");System.out.println();}//冒泡法排序

publicstaticvoidBubbleSort(intindex){inti,j;inttemp;for(j=1;j<index;j++){for(i=index-1;i>=j;i--){ if(data[i]<data[i-1]){//比較相鄰的兩個(gè)數(shù)

temp=data[i];data[i]=data[i-1];//*********Found**********data[i-1]=__________________;}}}}}綜合運(yùn)用無題目6importjavax.swing.*;importjava.awt.*;importjava.awt.event.*;//*********Found**********publicclassJava_3extends__________________implementsActionListener{privateJFrameframe;privateJTextFieldname;privateJPasswordFieldpass;privateJLabelnameLabel;privateJLabelpassLabel;privateJPaneltextPanel;privateJPanellabelPanel;privateJButtonbutton;privateJTextAreatextArea;

publicvoidinitGUI(){frame=newJFrame("FramewithDialog");//*********Found**********frame.________________(this);button=newJButton("JDialog");//*********Found**********button._______________(this);textArea=newJTextArea("",3,10);

frame.getContentPane().add(textArea,BorderLayout.CENTER);frame.getContentPane().add(button,BorderLayout.NORTH);

frame.setSize(400,300);frame.setVisible(true); }代碼未完，見下一頁(yè)publicvoidactionPerformed(ActionEvente){finalJDialogdia=newJDialog(frame,"logininformation");JButtonok=newJButton("ok");ok.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){textArea.setText("");textArea.append("name:"+name.getText()+"\r\n");textArea.append("passWord:"+newString(pass.getPassword())+"\r\n");//*********Found**********dia.setVisible(________________);//隱藏對(duì)話框

}}); name=newJTextField("",10);pass=newJPasswordField("",10); pass.setEchoChar('*');textPanel=newJPanel();textPanel.setLayout(newGridLayout(2,1,10,10));textPanel.add(name);textPanel.add(pass);

nameLabel=newJLabel("name");passLabel=newJLabel("passWord");labelPanel=newJPanel();labelPanel.setLayout(newGridLayout(2,1,20,20));labelPanel.add(nameLabel);labelPanel.add(passLabel);

代碼未完，見下一頁(yè)dia.getContentPane().add(labelPanel,BorderLayout.WEST);dia.getContentPane().add(textPanel,BorderLayout.CENTER); dia.getContentPane().add(ok,BorderLayout.SOUTH);dia.setSize(200,130);dia.setVisible(true);}

publicvoidwindowClosing(WindowEventevent){frame.setVisible(false);System.exit(0);}

publicstaticvoidmain(Stringargs[]){Java_3example=newJava_3();//*********Found**********example.____________;}}綜合運(yùn)用7importjava.text.*;publicclassJava_3{publicstaticvoidmain(String[]args){Personp=newStudent("王甜甜","計(jì)算機(jī)科學(xué)");System.out.println(p.getName()+","+p.getDescription());}}abstractclassPerson{publicPerson(Stringn){name=n;}//*********Found********public_______________StringgetDescription();publicStringgetName(){returnname;}privateStringname;}//*********Found********classStudent___________Person{publicStudent(Stringn,Stringm){super(n);major=m;}//*****