Java软件开发工程师面试题

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25System,out.println(Mthread2issleepingtenmillisecond...'1);try(Thread,sleep(10);}catch(InterruptedExceptione){//TODOAuto-generatedcatchblocke.printStackTrace();)

26synchronizedvoidgetX(){}}50ஹÉ
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2854ஹ¾¿synchronizedjava.util.concurrent.locks.LockḄÀk?Â⌕ÃkÄ[Lock¼ᡂsynchronizedᡠ¤ÆḄᡠᨵÇÂ⌕kÄ[LockᨵsynchronizedÈÉḄ¸ÊÈḄឋ஺synchronizedÌ8ÍÎ┝Lock
"⌕Ï{ᕒÑÒÍÎ$EFᙠfinally¹|ÍÎ஺Lock9ᨵÈÓᜧḄÇÔ᝞2ḄtryLock?=p«¬ÕÖ×┝஺ØÔÙÚÛ.Ü☢Ḅ⚪ᵨlockQD_ᦋᑏá[packagecom.huawei.interview;importjava.util.concurrent.locks.Lock;importjava.util.concurrent.locks.ReentrantLock;publicclassThreadTest{/***@paramargs*/privateintj;privateLocklock=newReentrantLock();publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubThreadTesttt=newThreadTest();for(inti=0;i<2;i++)(newThread(tt.newAdder()).start();newThread(tt.newSubtractor()).start();))privateclassSubtractorimplementsRunnable(@Overridepublicvoidrun(){//TODOAuto-generatedmethodstubwhile(true)("synchronized(ThreadTest.this){System.out.println("j-="+j-)ä஻fæçÀè_┝ÍÎᔩU

29}*/lock.lock();try(System.out.println("j-="+j--);}finally(lock.unlock();)}}}privateclassAdderimplementsRunnable(©Overridepublicvoidrun(){//TODOAuto-generatedmethodstubwhile(true)("synchronized(ThreadTest.this){System.out.println("j++="+j++);}*/lock.lock();try{System.out.println("j++="+j++);}finally{lock.unlock();}}))}55ஹêë4ᐸ|ìí.jî^1ï᜜ì.jíð1஺ᑏñ{஺=Ü{:ᵨᑁhm¤Æ.jîðḄ᎛dᨵὃ⇋ô{õ⚪஺

30publicclassThreadTestlprivateintj;publicstaticvoidmain(Stringargs[]){ThreadTestltt=newThreadTestl();Incinc=tt.newlnc();Decdec=tt.newDec();for(inti=0;i<2;i++){Threadt=newThread(inc);t.start();t=newThread(dec);t.start();)}privatesynchronizedvoidinc(){j++;System.out.println(Thread.currentThread().getName()+n-inc:"+j);)privatesynchronizedvoiddec(){j-;System.out.println(Thread.currentThread().getName()+"-dec:u+j);)classIncimplementsRunnable{publicvoidrun(){for(inti=0;i<100;i++){inc();}))classDecimplementsRunnable{publicvoidrun(){for(inti=0;i<100;i++){dec();))))------÷ÑøᑏḄ
--------classA{JMangerj=newJManager();main()

31newA().call();)voidcall{for(inti=0;i<2;i++){newThread(newRunnable(){publicvoidrun(){while(true){j.accumulate()}}})start();newThread(newRunnable(){publicvoidrun(){while(true){j.sub()}}}).start();}}}classJManager(privatej=0;publicsynchronizedvoidsubtract()(j-)publicsynchronizedvoidaccumulate()(j++ä))56ஹùúû10í¡ḼÂúû100,¡Ḽýþᑮùúû10í¡ḼøþᑮÂýúû100᝞úû50íÿᑏ
஺ᨬḄṹ᝞publicclassThreadTest{/**

32*@paramargs*/publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubnewThreadTest().init();)publicvoidinit()(finalBusinessbusiness=newBusiness();newThread(newRunnable()(publicvoidrun(){for(int0;iv50;i++)(business.SubThread(i);}))).start();for(inti=0;i<50;i++)(business.MainThread(i);))privateclassBusiness(booleanbShouldSub=true;//
ᑴ᡻ḄpublicsynchronizedvoidMainThread(inti)(if(bShouldSub)try{this.wait();}catch(InterruptedExceptione){//TODOAuto-generatedcatchblocke.printStackTrace();)

33for(intj=0;j<5;j++)System.out.println(Thread.currentThread().getName()+”:i="+i+”+j))bShouldSub=true;this.notify();publicsynchronizedvoidSubThread(inti)(if(ibShouldSub)try(this.wait();}catch(InterruptedExceptione){//TODOAuto-generatedcatchblocke.printStackTrace();)for(intj=O;j<1O;j++)(System,out.println(Thread.currentThread().getName()+":i="+i+3+j))bShouldSub=false;this.notify();}))ᜓᩭᑏ
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34//TODOAuto-generatedmethodstub/*newThread(){publicvoidrun()(for(inti=0;i<50;i++)(for(intj=O;j<1O;j++)(System.out.pnntln("i=u+i+",j="+j);)))}.start();7//finalStringstr=newString஺");newThread(newRunnable()(publicvoidrun()(for(inti=0;i<50;i++)(synchronized(ThreadTest.class){if(bShouldMain)(try{ThreadTest.class.wait஺;}catch(InterruptedExceptione){e.printStackTrace();))for(intj=O;j<1O;j++)(System.out.println(Thread.currentThread().getName()+“i="+i+"J="+j))bShouldMain=true;ThreadTest.class.notify();

35)☢=ᵨjdk5;Ḅ?@AᩭBCḄimportjava.util.concurrent.Executors;importjava.util.concurrent.ExecutorService;importjava.util.concurrent.locks.Lock;importjava.util.concurrent.locks.ReentrantLock;importjava.util.concurrent.locks.Condition;publicclassThreadTest{privatestaticLocklock=newReentrantLock();privatestaticConditionsubThreadCondition=lock.newCondition();privatestaticbooleanbBhouldSubThread=false;publicstaticvoidmain(String[]args)ExecutorServicethreadPool=Executors.newFixedThreadPool(3);

36threadPool.execute(newRunnable(){publicvoidrun()(for(inti=0;i<50;i++){lock.lock();try{if(!bBhouldSubThread)subThreadCondition.await();for(intj=O;j<1O;j++)(System.out.println(Thread.currentThread().getName()+",j="+j))bBhouldSubThread=false;subThreadCondition.signal();}catch(Exceptione){)finally(lock.unlock();)}}})threadPool.shutdown();for(inti=0;i<50;i++)(lock.lock();try(if(bBhouldSubThread)subThreadCondition.await();for(intj=O;j<1O;j++)(System.out.println(Thread.currentThread().getName()+)bBhouldSubThread=true;subThreadCondition.signal();

37}catch(Exceptione))finally(lock.unlock();})})57ஹEFCollection᪾HḄI᪀KLM@ᢵ⚪ᜩᓭQᓅSTUV⌕WXYZ[\]^_ᳮabcᓽ஺58ஹCollection᪾H;BCde⌕BCfghicomparable/comparator59ஹArrayListjVectorḄkXK.$%:lBCmListhi(ListhiopmCollectionhi)rsltᨵvᔠᓽxyᙠ.$%vᔠ;Ḅᐗ{Ḅ|}ltᨵ~Ḅ#᝱Ḅᦪᡃs44ᢥ|}
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47>assertionᙠḄᩩboolean⊤!"#$boolean⊤Ḅ%&true'᝞)*%&false+,-.ᜐ01Ḅ2᝱4assert56789ᡈ⌨7஺<ᩭ+assertionᵨ0#$ᨬ@AஹᐵDḄឋ஺assertionFGᙠHIJKLMHN஺&OPQឋRᙠSTIUVassertionFGᐵWḄ஺packagecom.huawei.interview;publicclassAssertTest{/***@paramargs*/publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubinti=0;for(i=0;i<5;i++)(System.out.println(i);)//Ꮇ\1]^_OT'-i'asserti==5;))81'java'()ᙠᑁ),-ᔩ/0ᓫ23஺ᡠbᑁde☄ᢣ1hijᵨḄkᡈlmniᓰpᙠᑁd஺javaᨵᚗstᦈᑴvw#$k1hixᵨḄM᎛ᓽk{O|}ḄM᎛k5~iᚗstᦈᘤᑁd◀ᣵ஺ᵫ0JavajᵨᨵᔣḄᚗstᦈᳮvw◀xᵨḄ⚪᝞ᨵkxᵨ⌕J᪷1vḄGCvwtᦈḄ᝞4☢Ḅṹvwᑮ
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48System.out.println("exitgctestl'1);)privatestaticclassPerson(byte[]data=newbyte[20000000];Personmate=null;publicvoidsetMate(Personother)mate=other;)

49javaḄᑁde☄Ḅ¡¢£¤¥ᕜ§Ḅkᢝᨵ©¤¥ᕜ§kḄxᵨªvRI¤ᑁde☄«©¤¥ᕜ§k-.1h◤⌕®&£¤¥ᕜ§kᢝᨵḄxᵨ¯°±1Ritᦈjavaᑁde☄ḄI¤²³F´ᙢ+ᕒvR·¸OkwVn1hjᵨkkᓾnixᵨᓽkºᵨᓾº»iᚗstᦈᘤtᦈḄjavavR7ᑁde☄Ḅ¡᝞¼d½¾ᡃÀÁOkÂᙠ¼d(᝞ÂᙠᐰÅmapk)ᯠVn1hjᵨkni¼dxᵨᓾ1hijᵨ஺javaḄᑁde☄Ç⌕È5ᔜ
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ᐗᡠᙠḄḄnullᓽ)ᡃᙠᑮᚮ᪘ᐺḄ!"#ᡃ$⌕&ᵨ()Ḅ*☢Ḅ,ᡃᑮḄ,-./ᑮḄ0ᯠ᝞34ᨵᙠ-./ᑮ6789:;ᡃ<=>Ḅᑮ,:ᡃ?,ᡃ<=ᑮḄ>4ᨵ)@AḄ஺publicclassStack{privateObject[]elements=newObject[10];privateintsize=0;publicvoidpush(Objecte){ensureCapacity();elements[size++]=e;)publicObjectpop(){if(size==0)

50thrownewEmptyStackException();returnelements[--size];)privatevoidensureCapacity(){if(elements.length==size){Object[]oldElements=elements;elements=newObject[2*elements.length+1];System.arraycopy(oldElements,0,elements,0,size);))).☢ḄCᳮEFGHᓫᎷ᝞ᚮ᪘K10ᐗᯠLᐰNOPᩭRᯠᚮ᪘,SḄ4ᨵᡃT⌕ḄUVW,X,YZ,[\]ᦈḄX_`ᔠᑁcd☄Ḅfᩩh[ᵨ[\]ᦈ஺W,i,cᙠX᪵ḄUV>8klm"no᪵ḄL3᝞3Xᚮ᪘ᵨḄpq>irstKᑁcuvwxᡃTḄᑁcy.GTz{lᨵno|}~?XUVGil]ᦈḄᨵnoᐵ஺*☢/f஺1publicclassBad{publicstaticStacks=Stack();static{s.push(newObject());s.pop();//X{ᨵ8YZᑁcd☄

51s.push(newObject());//.☢ḄYZ!]ᦈ#,<ៜ)),statici8cᙠᑮ⌨PW,ᡃT>!/ᑮᨵ<ៜ6i,?᝞3ḄStackᨬᨵ100YZoᨬ>iᨵ100YZ[\]ᦈᐸXEFG᧕ᳮ,StackᑁNᢝᨵ100&ᵨᨬḄi,Ty,[ᵨḄᡃT8Ḅ!¡Ḅ&ᵨ<ᯠ¢ᜫ¤ᑁcd☄Ḅ¥᜜8§08YZc¨HashSet©ᔠª!Li6«ᦋXYZªḄ®¯°±²³Ḅ´9ᔲᑣYZ«ᦋLḄ²³¯ᨬ·c¨HashSet©ᔠª:Ḅ²³i¸ᙠX§*ᓽ¹ᙠcontainsº\¹ᵨFYZḄ0¡&ᵨ»Ḅ®ᦪ½HashSet©ᔠª¾¿YZ>
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52*/publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubSystem.out.printlnCstring");))Ḅ┯᝞java.Iang.NoSuchMethodError:mainExceptioninthread"main"jreḄjava.lang.Stringᨵmain஺83.Javaṹ!┯1.abstractclassName{privateStringname;publicabstractbooleanisStupidName(Stringname){})ᜧ#$ᨵ%┯&'ᫀ┯஺abstractmethod)*+ᑖ-./0123-஺2.publicclassSomething{voiddoSomething(){privateStrings=intI=s.length();))ᨵ┯ᔩ&'ᫀ┯஺567891:;<=%>?@⛲B(privatepublicDprotected)஺finalE+ᵨᩭ@⛲5678(final᝞HabstractDstrictfpIJ>?@⛲BstrictfpK:@⛲classDmethodJvariable)஺3.abstractclassSomething{privateabstractStringdoSomething();

53)LMNO┯ᔳ&'ᫀ┯஺abstractḄmethods1:+private@⛲஺abstractḄmethodsQRSimplement(TU)ᐹWX⁚ḄZOE+ᵨprivate[abstractmethod\┝^ᩭᕖ&(Hᳮabstractmethod91:final)஺4.publicclassSomething{publicintaddOne(finalintx){return++x;))abcde஺'ᫀ┯஺intxf@⛲ᡂfinalhᕡḼx1:ᙠaddOnemethodf@ᦋ஺5.publicclassSomething{publicstaticvoidmain(String[]args){Othero=newOther();newSomething().addOne(o);)publicvoidaddOne(finalOthero){o.i++;))classOther{publicinti;)Dm☢ḄopqIᐵsfinalḄ?⚪ᨵ┯ᔩ&'ᫀuv஺ᙠaddOnemethod>xᦪof@⛲ᡂfinal஺᝞zᙠaddOnemethod{ᡃ$@ᦋ஺Ḅreference(b᝞o=newOther();)}O᝞Hm~⚪┯Ḅ஺{@ᦋḄoḄmembervairable(ᡂᕒ78)஺Ḅreferenceᨵᦋ7஺6.

54classSomething{inti;publicvoiddoSomething(){System.out.println("i=0+i);))ᨵNO┯ᕖ&1ᩭ஺'ᫀuv஺Ḅ"i=0"஺intiinstantvariable(T~78ᡈᡂᕒ78)஺instantvariableᨵdefaultvalue஺intḄdefaultvalue0஺7.classSomething{finalinti;publicvoiddoSomething(){System.out.pnntln(Hi=H+i);))Dm☢⚪Kᨵaᙢ1HQafinal஺⍝Q┯ᔩ&'ᫀ┯஺finalintiafinalḄinstantvariable(T~78ᡈᡂᕒ78)஺finalḄinstantvariableᨵdefaultvalue)*ᙠconstructor(᪀⌼ᘤ).9fadvḄ஺E+@ᦋ"finalinti=0;*'஺8.publicclassSomething{publicstaticvoidmain(String[]args){Somethings=newSomething();System.out.println("s.doSomething()returns"+doSomethingO);)publicStringdoSomething(){return"Dosomething…”;)

55)mo஺'ᫀ┯஺mᙠmain{calldoSomethingᨵNO?⚪amethodsIᙠHaclass{஺XmainstaticḄ஺staticmethod1:callnon-staticmethods஺Eᦋᡂ"System.out.println(Ms.doSomething()returns"+s.doSomethingO);"஺Hᳮstaticmethod1:>?non-staticinstantvariable஺9.¡ᜐSomethingḄᦻ¤¥OtherThing.javaclassSomething{privatestaticvoidmain(String[]something_to_do){System.out.printlnC'Dosomething...”)¨))aLMode஺'ᫀuv஺©ᩭᨵª«¬JavaḄClass¥)*Dᐸᦻ¤¥pH஺publicclassḄ¥)*Dᦻ¤¥pH஺10•interfaceA{intx=0;}classB{intx=1;)classCextendsBimplementsA{publicvoidpX(){System.out.println(x);)publicstaticvoidmain(String[]args){newC().pX();

56)'ᫀ┯஺ᙠ¯°±²³´┯(┯µ¶1HḄJVMᨵ1HḄ·¸h¹QºdvḄx»ᵨaxIᓛ½(Q¾ᙠH±importjava.utilDjava.sqlaᒹ±ÀdDate᪵)஺Âs᱄Ḅ78E+ᵨsuper.xᩭdvÄḄឋÆÇ◚Épublicstaticfinal.ᡠ+E+ˬA.xᩭdv஺11.interfacePlayable{voidplay();)interfaceBounceable{voidplay();)interfaceRollableextendsPlayable,Bounceable{Ballball=newBallCRingPang'*);)classBallimplementsRollable{privateStringname;publicStringgetName(){returnname;}publicBall(Stringname){this.name=name;)publicvoidplay(){ball=newBall(HFootbair);System.out.println(ball.getName());))a┯1Ì᧕³U஺'ᫀ┯஺"interfaceRollableextendsPlayable,Bounceable"ᨵ?⚪»interface

57EÏÐainterfacesᡠ+{┯஺?⚪ᙠinterfaceRollable{Ḅ"Ballball=newBall(^,PingPang'^);,^஺=%ᙠinterface{ÀdḄinterfacevariable(Ä78EÑᡂᕒ78)ÆÇpublicstaticfinal஺Q«"Ballball=newBall("PingPang”)ÒT▭m"publicstaticfinalBallball=newBall(',PingPang");,,ᙠBallḄPlay()"ball=newBall("Football',);Hᦋ7ballḄreference{ḄballᩭRollableinterface»Rollableinterface{ḄballpublicstaticfinalḄfinalḄobject1:fᦋ7referenceḄ஺¡¯°ᘤÔᙠ"ball=newBallC'Football");"{eÕᨵ┯஺Ö.×دÙ1'¯ᑏaÙÜÔa.txtᦻ¤ḄᓫÞØb.txtᦻ¤ḄᓫÞßàᔠᑮC.txtᦻ¤a.txtᦻ¤ḄᓫÞᵨãäBᑖ◞b.txtᦻ¤ᵨãäᡈæçèéᑖ◞஺'packagecn.itcast;importjava.io.File;importjava.io.FileReader;importjava.io.FileWriter;publicclassMainClass{publicstaticvoidmain(String[]args)throwsException!FileManagera=newFileManager("a.txt",newcharÄ{'

58'});FileManagerb=newFileManager(Mb.txtn,newcharnCXn'¨'});FileWriterc=newFileWriter(”c.txt")¨StringaWord=null;StringbWord=null;while((aWord=a.nextWord())!=null){c.write(aWord+H

59M);bWord=b.nextWord();if(bWord!=null)c.write(bWord+"

60H);}while((bWord=b.nextWord())!=null){c.write(bWord+H

61M);)c.close();}

62}classFileManager{String[]words=null;intpos=0;publicFileManager(Stringfilename,char[]seperators)throwsException{Filef=newFile(filename);FileReaderreader=newFileReader(f);char[]but=newchar[(int)f.length()];intlen=reader,read(but);Stringresults=newString(buf,O,len);Stringregex=null;if(seperators.length>1){regex=""+seperators[0]+T+seperators[1];}else{regex=""+seperators[0];)words=results.split(regex);}publicStringnextWord(){if(pos==words.length)returnnull;returnwords[pos++];))2ஹ¯ᑏaÙÜÔd:\javaëìḄᡠᨵ.javaᦻ¤íᑴᑮd:\jadëìÔïᩭᦻ¤Ḅ᡽ñ¥©.javaᦋ.jad஺(ᜧòuᙠóm☢⍝⚪ômõᑮḄö÷øóó⍝⚪ùúû)*:¯ᑏüýᓫ?⚪Ḅṹþ)'listFilesÿ
FileFilter
FileFilter⇋ḄᶍḄḄFileFilterᓽḄᶍ஺importjava.io.File;importjava.io.FilelnputStream;

63importjava.io.FileOutputStream;importjava.io.FilenameFilter;importjava.io.lOException;importjava.io.Inputstream;importjava.io.Outputstream;publicclassJad2Java{publicstaticvoidmain(String[]args)throwsException{FilesrcDir=newFile("java");if(!(srcDir.exists()&&srcDir.isDirectory()))thrownewException("ᙠ")File[]files=srcDir.listFiles(newFilenameFilter(){publicbooleanaccept(Filedir,Stringname){returnname.endsWith(".javaH);}))System.out.println(files.length);FiledestDir=newFile(*'jad");if(!destDir.exists())destDir.mkdir();for(Filef:files){FilelnputStreamfis=newFilelnputStream(f);StringdestFileName=f.getName().replaceAII("\\.java$w,M.jad");FileOutputStreamfos=newFileOutputStream(newFile(destDir,destFileName));copy(fis,fos);fis.close();fos.close();))privatestaticvoidcopy(lnputStreamips,Outputstreamops)throwsException{intlen=0;byte[]but=newbyte[1024];while((len=ips.read(buf))!=-1){ops.write(buf,0,len);))

64)ᵫ"⚪$%Ḅ&'(ᶍ)*Ḅ+᪆-1.classjad2java{1..ᑮ0
1ḄᡠᨵḄjavaᦻ56ᔠ1.1.ᑮFilesrcDir=newFile(”d:\\java")1.2.ᑮ1Ḅᡠᨵjavaᦻ5-File[]files=srcDir.listFiles(newMyFileFilter());1.38'.ᑮ.javaḄᦻ5-classMyFileFilterimplememytsFileFilter{publicbooleanaccept(Filepathname)(returnpathname.getNameO.endsWithJ^.java"))}2.9:
ᦻ5;ᑴᑮ=᜜
?ᦋ᡽BC2.1.ᑮ᪗᝞F᪗ᙠᑣHIJ2.2᪷LMᦻ5C.ᑮ᪗ᦻ5CNO⌕ᵨRᑣ⊤T*NO•ḄVW஺2.3᪷L⊤XḄFileY᪗ᦻ5CḄZ[\.ᑮ⊤X᪗ᦻ5ḄFile஺஻⌕ᙠ^_`abᙢHId
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lmlmḄqᦪsᵨthḄu*஺//lmwxḄqᦪyz{|☢ᔣ᱄yt᪵〉☢஺}ᑖ᪆listFileslmᑁḄᶍ)*ᳮFile[]listFiles(FileFilterfilter){FileQfiles=listFilesQ;//ArraylistacceptedFilesList=newArrayList();File[]acceptedFiles=newFile[files.length];intpos=0;for(Filefile:files){booleanaccepted=filter.accept(file);if(accepted){//acceptedFilesList.add(file);acceptedFiles[pos++]=file;)Arrays.copyOf(acceptedFiles,pos);//return(File[])accpetedFilesList.toArray();)

653ஹᑏ
Z[\Ḅᦪᐭp
Z[\YZ⁚ᦪdpᢥZ⁚ḄZ[\⌕Z
᝞“ᡃABC4“ᡃAB'ᐭ“ᡃABCDEF6d“ᡃABC“ᡃABCᩗḄ
”£-✌ᐜ⌕+`ᦻZ[ᨵ¦§ṹ(ᔜ§ṹḄᱯ«஺Ꮇnp⌕ḄZ⁚ᦪ஺publicstaticvoidmain(String[]args)throwsException{Stringstr="ᡃa᰿`¯abcᡃ᰿°±def;Stringstr="ᡃABC”intnum=trimGBK(str.getBytes("GBK"),5);System.out.println(str.substring(0,num));}publicstaticinttrimGBK(byte[]bufjntn){intnum=0;booleanbChineseFirstHalf=false;for(inti=0;i

66charc=content.charAt(i);Integernum=map.get(c);if(num==null)num=1;elsenum=num+1;map.put(c,num);)for(Map.EntrySetentry:map)(system.out.println(entry.getkey()+“-”+entry.getValue());)ǸÈÉ☢ÊḄË
Ìᕒ⊤ÎÏÐÑ⚪ÒÓÔ-᝞F\Z[᝞"aaaabbc`Â1512”⌕ᑖÕ·¸µᦻZ[Ḅᦪ|`ᦻZ[Ḅᦪ|YᦪZZ[Ḅᦪ|ᎷZ[`Öᨵ`ᦻZ[ஹµᦻZ[ஹᦪZZ[J᜜Ḅᐸ×ᱯØZ[஺intengishCount;intchineseCount;intdigitCount;for(inti=O;i=*O'&&chv='9,)(digitCount++)elseif((ch>='a'&&chv='z')||(ch>='A'&&chv='Z))(engishCount++;)else(chineseCount++;}}System.out.println();5ஹÙÚÛÜ`⍗ᑮḄÞß᪛ᵨjavaÞß᪛áᔠ¸)*஺

67âṹ᝞1-packagecom.huawei.interview;publicclassNode{publicintvalue;publicNodeleft;publicNoderight;publicvoidstore(intvalue)(if(value

68elseif(value>this.value)if(right==null)(right=newNode();right.value=value;}else(right.store(value);)))publicbooleanfind(intvalue)(System.out.println("happen"+this.value);if(value==this.value)(returntrue;}elseif(value>this.value)(if(right==null)returnfalse;returnright.find(value);}else(if(left==null)returnfalse;returnleft.find(value);)publicvoidpreList()(System.out.print(this.value+if(left!=null)left.preList();if(right!=null)right.preList();}publicvoidmiddleList()(if(left!=null)left.preList();System,out.print(this.value+**,**);

69if(right!=null)right.preList();)publicvoidafterList()(if(left!=null)left.preList();if(right!=null)right.preList();System.out.print(this.value+}publicstaticvoidmain(String[]args)(int[]data=newint[20];for(inti=O;i

70publicNode(intvalue){this.value=value;)publicvoidadd(intvalue){if(value>this.value)(if(right!=null)right.add(value);else(Nodenode=newNode(value);right=node;))else{if(left!=null)left.add(value);else(Nodenode=newNode(value);left=node;)}}publicbooleanfind(intvalue){if(value==this.value)returntrue;elseif(value>this.value){if(right==null)returnfalse;elsereturnright.find(value);}else{if(left==null)returnfalse;elsereturnleft.find(value);)}publicvoiddisplay(){System.out.println(value);if(left!=null)left.display();if(right!=null)right.display();

71)

72/*publicIteratoriterator(){}*/publicstaticvoidmain(String[]args){int[]values=newint[8];for(intè0;iv8;i++){intnum=(int)(Math.random()*15);//System.out.println(num);//if(Arrays.binarySearch(values,num)<0)if(!contains(values,num))values[i]=num;elsei-}System.out.println(Arrays.toString(values));Noderoot=newNode(values[0]);for(inti=1;i

736ஹéyê᝞1Ḅᦻ"ᦻ5`ëdᡠᨵḄìC?ᡭᓺdí;ḄìCYí;Ḅäᦪ?ᢥí;äᦪ᣸ï-1,ðñ282,òó,353,ðñ,284,ôõ,355,ðñ286,òó,357,ö÷,288,ᵪù,35úïâṹ᝞1(£⚪⌕û.ᵨᓫýḄþÿᒹᵨ☢Ḅᙬ᝞ᑮḄ஺⌕!"#Ḅ$%)(packagecom.huawei.interview;importjava.io.BufferedReader;importjava.io.lOException;importjava.io.Inputstream;importjava.io.InputStreamReader;importjava.util.Comparator;importjava.util.HashMap;importjava.util.Iterator;importjava.util.Map;importjava.util.TreeSet;publicclassGetNameTest{/***@paramargs*/publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstub//Inputstreamips=GetNameTest.class.getResourceAsStream(7com/huawei/interview/info.txt");//ᵨ+,$%Ḅ-ṹ/0+,Ḅ-ṹ123info.txt4GetNameTest5ᙠ7+ᒹ0☢ᡠᵨ0☢Ḅ9:#;<=Mapresults=newHashMap();Inputstreamips=GetNameTest.class.getResourceAsStream("info.txr);BufferedReaderin=newBufferedReader(newInputStreamReader(ips));

74Stringline=null;try{while((line=in.readLine())!=null)(dealLine(line,results);)sortResults(results);}catch(lOExceptione){//TODOAuto-generatedcatchblocke.printStackTrace();))staticclassUser(publicStringname;publicIntegervalue;publicUser(Stringname,Integervalue)(this.name=name;this.value=value;)©Overridepublicbooleanequals(Objectobj){//TODOAuto-generatedmethodstub//0☢Ḅ-ṹ>ᨵ᡻,ABCtreesetDEᦪGHIJᵨᑮequalsKL஺booleanresult=super.equals(obj);System.out.println(result);returnresult;))privatestaticvoidsortResults(Mapresults){//TODOAuto-generatedmethodstubTreeSetsortedResults=newTreeSet(newComparator(){publicintcompare(Objecto1,Objecto2){//TODOAuto-generatedmethodstubUseruseri=(User)o1;Useruser2=(User)o2;/*᝞compareToMNO0ஹᑣQ3RS:T9UVḄ:TIEᑮWᔠDY

75*ᡠZ[\ᵨ0☢Ḅ-ṹᔲᑣ^_Sᦪ97Ḅᐸabᡭᓺeᩭ஺**///returnuseri.value-user2.value;//returnuseri.valueuser2.value)(return1;}else(returnuseri.name.compareTo(user2.name);})));Iteratoriterator=resuIts.keySet().iterator();while(iterator.hasNext())(Stringname=(String)iterator.next();Integervalue=(Integer)results.get(name);if(value>1)(sortedResults.add(newUser(name,value));})printResults(sortedResults);}privatestaticvoidprintResults(TreeSetsortedResults)(Iteratoriterator=sortedResults.iterator();while(iterator.hasNext())(Useruser=(User)iterator.next();System.out.println(user.name++user.value);))publicstaticvoiddealLine(Stringline,Mapmap)

76if(•"".equals(line.trim()))String[]results=line.split(",");if(results.length==3)(Stringname=results[1];lntegervalue=(lnteger)map.get(name);if(value==null)value=0;map.put(name,value+1);))))7ஹᑏ+SSingletoneᩭ஺i+j(⛳lm=publicclassSingleTon{privateSingleTon(){)஻!oᓄqᙠ☟᝱-ṹᙽuvwxḄ᡻,ᦔ᳛{Z|ᓰᵨ~privatefinalstaticSingleToninstance=newSingleTon();publicstaticSingleTongetlnstance(){returninstance;))ij(⛭lm=publicclassSingleTon{privateSingleTon(){}privatestaticinstance=null;//newSingleTon();publicstaticsynchronizedSingleTongetlnstance(){if(instance==null)instance=newSingleTon();returninstance;))ij(ᵨ

77publicenumSingleTon{ONE;}i(|!▭Ḅᵨ(ᙠᵨᓫo)publicclassSequenceGenerator{//0☢5ḄZ-ṹprivateintcount=0;publicsynchronizedintgetSequence(){++count;)//0☢5ᡂᓫoḄ-ṹprivateSequenceGenerator(){}privatefinalstaticinstance=newSequenceGenerator();publicstaticSingleTongetlnstance(){returninstance;))i(publicclassMemoryDao(privateHashMapmap=newHashMapOpublicvoidadd(Studentstu1){map.put(SequenceGenerator.getlnstance().getSequence(),stu1);)//MemoryDaoᡂᓫoSingletonm=⌕ᵨᙠJavaᵨwxD+S5Classᨵ+S!oᙠ஺+Singletonm=ᨵ¡jj<=(i+j<=(¢£+S5,¥Ḅ᪀⌼¨ᦪ3privateḄ■¥ᨵ+SstaticḄprivateḄ5ª,ᙠ5«¬ᓄH!o®+SpublicḄgetlnstanceKL¯°:¥

78Ḅ±ᵨ²³´ᵨᐸDḄKL஺publicclassSingleton{privateSingleton(){}//ᙠµᑁ·¢£µ+S!o¸᜻º»//$¼½private¾ᑁ·´ᵨprivatestaticSingletoninstance=newSingleton();//½u¾¿+S¾᜜·ÁÂclassḄ☟᝱KL[\ÁpublicstaticSingletongetlnstance(){returninstance;}}ij<=(publicclassSingleton{privatestaticSingletoninstance=null;publicstaticsynchronizedSingletongetlnstance(){//½SKLÃ☢ᨵᡠᦋÅᵨÆÇ1Å,Èᡂ:Ti+Ç//JᵨHÈᡂ!ov¿ᦔ᳛Éif(instance==null)instance=newSingleton();returninstance;)}ᐸa<=(¢£+S5■¥Ḅ᪀⌼¨ᦪ3privateḄᡠᨵKL3staticḄ஺+Q3i+j<=⌕|Êᐰ_8ஹ⌴ÍÎL⚪1+S᦮ᦪᜧÒ0ᵨÓÔ/Âᙢªᢥ᯿n2n4n8nḄØx⌴EÙÚᜧÒ5000HÚᢥ᯿ᢣ¢ØxÜeᩭ஺o(n=1237ᑣÜe3(12372474494898969896494824741237Ý(ᑏwxHᐜßàᢥ⌴EK=Ḅ-ṹᑏ⌴EḄáâEὃ⇋⌴å·ᑖ஺publicstaticvoiddoubleNum(intn)

79System.out.println(n);if(n<=5000)doubleNum(n*2);System.outprintln(n);Gaibaota(N)=Gaibaota(N-l)+n9ஹ⌴ÍÎL⚪2i1Sç10i2SÃi1Sçᜧ2èéÇ⌴êëᵨ⌴ÍK=ìÎei8Sçíᜧ»packagecn.itcast;importjava.util.Date;publicclassA1{publicstaticvoidmain(String[Jargs)(System.out.println(computeAge(8));)publicstaticintcomputeAge(intn)(if(n==1)return10;returncomputeAge(n-1)+2;

80)publicstaticvoidtoBinary(intn,StringBufferresult)if(n/2!=0)toBinary(n/2,result);result.append(n%2);1oஹ᣸x1ᨵï¡jKL»ëᑡ஺ᵨJAVA!+Sñò᣸x஺ÂçẆô®ᑈö᣸xஹ⌱ø᣸x/ñò᣸x0☢ñò᣸xḄ-ṹ(publicclassQuicksort{/***ñò᣸x*@paramstrDate*@paramleft*@paramright7publicvoidquickSort(String[]strDate,intleft,intright){Stringmiddle,tempDate;inti,j;ùleft;j=right;middle=strDate[(i+j)/2];do{while(strDate[i].compareTo(middle)<0&&i0&&j>left)H//úeýüÃDÚþḄᦪif(i<=j){//ÿ
ᜧḄᦪ
ḄᦪᣚtempDate=strDate[i];strDate[i]=strDateO]strDateO]=tempDate;i++

81)}while(i<=j);/Zὅ┯if(ileft){quickSort(strDate,left.j);))/***@paramargs7publicstaticvoidmain(String[]args){String[]strVoid=newString[]{"11","66","22',,"0H,55',,"22",,'0',,"32H};Quicksortsort=newQuickSort();sort.quickSort(strVoid,0,strVoid.length-1);for(inti=0;i

82(int)(Math.random()*1000))?@ḄAB᝞D(¥1011)->(FᓟHFIFᐗ᦮)KL஺NHḄṹDreturnsb.reverse().toString().replaceAII("H[IPQH°).replaceAII("H+SS").replaceAII("H+ᐗᐗ").replaceAII("HH")publicclassRenMingBi{/***@paramargsaddbyzxx,Nov29,20087privatestaticfinalchar[]data=newchar[]{‘H‘‘VWDX3ᾖ3Z3▮\]᳤‘)privatestaticfinalchar[]units=newchar[]{'ᐗ7IPVQSI3P3Q_’}

83publicstaticStringconvert(intmoney)StringBuffersbf=newStringBuffer();intunit=0;while(money!=0){sbf.insert(O,units[unit++]);intnumber=money%10;sbf.insert(O,data[number]);money/=10;}returnsbf.toString();})html&JavaScript&ajaxaᑖ1.ᑨdefghijeFghiᜧ᝞kᵨlmᑨdᵨᡝKᐭḄḄ;pq,'☢ḄrsB2004-11-21tu⌕wxᵨᡝḄKᐭ,ysBz{,rj᝞|ᨴ~ᜧ012..᜜ᡃ◤⌕ᵨᡝKᐭgz{Fg⌕jFgᐕᵨJAVASCRIP'஻*ᵨᑣ⊤BᑨdᑨdF'sBᯠᢥ'ᔜr;ᑁwindow.onload=function(){//ᑏ,¢£¤¥jsṹ¦htmlṹḄᑖ§ᡃ¨ᦋjsª«¬htmlṹ஺document.getElementByld("frm1").onsubmit=function(){vard1=this.dl.value;vard2=this.d2.value;if('verifyDate(d1)){alert("eFghisB")returnfalse;}if(!verifyDate(d2)){alert("efghisB");retumfalse;}if(!compareDate(d1,d2)){alert(nefghijeFhi”);returnfalse;}))functioncompareDate(d1,d2)

84vararrayDI=d1.split("-n);vardatel=newDate(arrayD1[0],arrayD1[1],arrayD1[2]);vararrayD2=d2.split("-M);vardate2=newDate(arrayD2[0],arrayD2[1],arrayD2[2]);if(date1>date2)returnfalse;returntrue;)functionverifyDate(d)(vardatePattern=/A\d{4}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2]\d|3[0-1])$/;returndatePattern.test(d);)2.ᵨtable®¯nᩩ±²³3ᣚF´µ⁐ᓽ123ᵨ¸⁐;¹456ᵨº⁐;¹7>89ᵨ¸µ⁐;¹஺12345678910window.onload=function()vartbl=document.getElementByld("tbl");

85rows=tbl.getElementsByTagName(',tr");for(i=0;i3ஹHTMLḄform¼᝞k½xᦪ¾ᦻm᪾Ḅᑁᐰa¢ᦪ;3ᔲᑣḄ¯ᵨᡝzÃ3functionchkForm(this)(varvalue=thist.dl.value;varlen=value.length;for(vari=0;i”9"||value.charAt(i)v"O"){alert("ÅᨵÆᦪ;;p”)returnfalse;)}returntrue;}4ஹᑏLᵨ0᪥½HTMLᦻm᪾=KᐭḄᑁᐰa¢ᦪ;ḄjavascriptÉÊ

86functionchkNumber(eleText)varvalue=eleText.value;varlen=value.length;for(vari=0;i"9,'||value.charAt(i)<"0H){alert("ÅᨵÆᦪ;;p)eleText.focus();break;))}◀£ᑏÌṹÍÎÏᙠÑ⚓ÓᑏL¤½ÔÕᙠṹ=Öᐭ¤¥×Øá☢âãFäåæÙÚḄÛÜÝÞÚḄßà஺5ஹ||Úᵨçèéajaxᢈë᪾ì||íîḄïðñ.Javawebaᑖ1'TomcatḄóᓄõ½DNᣵweb.xmlḄ÷øùjspúûᡂServlet஺ᨵüýᱥᳮᑁ
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¹ᫀ5A:selectdistinctnamefromscorewherenamenotin(selectdistinctnamefromscorewherescore<=80)B:selectdistincenamet1fromscorewhere80

103ÎyÏGḄÐÑ஺²KÔ5TestDBᨵÕÐÑ
ᨵ1-12ᨴÍḄÎyÏ஺AccID:ÐÑṹOccmonth:ÎyÏᨴÍDebitOccur5ÎyÏ஺ᦪ×5JcyAudit
ᦪ:Select*fromTestDB§ᜓᦪḄsqlṹ5droptableifexistsTestDB;createtableTestDB(idintprimarykeyautojncrement,AccIDvarchar(20),Occmonthdate,DebitOccurbigint);insertintoTestDBvalues(null,988-1-1',100),(null,'101','1988-2-V,110),(null,"01','1988-3-1',120),(null,,101V1988-4-1\100),(null,'101','1988-5-1',100),(null101'1988-6-1\100),(null,'101',,1988-7-1\100),(null101'1988-8-1\100);fᑴ☢Ḅᦪ
ᦑÔµ&fᨴÍḄÎyÏᦪsᦋ¶fÛinsertintoTestDBvalues(null,”021988-1-1',90),(null,,102,1988-2-1,,110),(null,,102,1988-3-1\120),(null102\,1988-4-1\100),(null,'102',,1988-5-1,,100),(null102'1988-6-1\100),(null10271988-7-1,,100),(null,”0271988-8-1',100);--ᑴᨬ☢Ḅᦪ
ᦑÔµᡠᨵÎyÏᦪsᦋᜧfÛinsertintoTestDBvalues(null103'1988-1-1\150),(null,'103','198821',160),(null,303?1988-3-1',180),(null,,1037198841',120),(null103'1988-5-1\120),(null/WS'.'l988-6-1\120),(null,”0371988-7-1',120),(null103'1988-8-1\120);-ᑴᨬ☢Ḅᦪ
ᦑÔµᡠᨵÎyÏᦪsᦋᜧfÛinsertintoTestDBvalues(null/W^/l988-1-V,130),(null104','1988-2-1\130),(null,'104','1988-3-1',140),(null,”0471988-4-T,150),(null/IO^J988-5-1,,160),(null,"04','198861',170),

104(null,'104',,1988-7-V,180),(null,”0471988-8-1',140);-ᑴᨬ☢Ḅᦪ
ᦑÔµ&©ᨴÍḄÎyÏᦪsᦋ¶fÛinsertintoTestDBvalues(null/WS';l988-1-V,100),(null.'IOS'/l988-2-1,,80),(null/IOS';l988-3-V,120),(null105'/1988-4-1\100),(null105\,1988-5-V,100),(null,"O5','1988-6-1',100),(null10571988-7-1\100),(null,'105','1988-8-1\100);¹ᫀ5selectdistinctAccIDfromTestDBwhereAccIDnotin(selectTestDB.AcclDfromTestDB,(select*fromTestDBwhereAcclD=*101')asdb101whereTestDB.Occmonth=db101.OccmonthandTestDB.DebitOccur<=db101.DebitOccur)11.ÝÞßᨴḄàáyearmonthamount199111.1199121.2199131.3199141.4199212.1199222.2199232.3199242.4|ᡂi᪵fyearmlm2m3m4

10519911.11.21.31.419922.12.22.32.4_`5iãäåᩩæçè
ãyḄÐÑᡂéwÕÓè஺§ᜓsql!"5droptableifexistssales;createtablesales(idintautojncrementprimarykey,yearvarchar(10),monthvarchar(10),amountfloat(2,1));insertintosalesvalues(null,”997,T,1.1),(null,”991',2,1.2),(null,”991',3,1.3),(null,”991',4,1.4),(null,”9921T,2.1),(null,,1992,2,,2.2),(null,”99213,2.3),(null,”992
,4,2.4);¹ᫀfஹselectsales.year,(selectt.amountfromsalestwheret.month='1'andt.year=sales.year)'1',(selectt.amountfromsalestwheret.month='1'andt.year=sales.year)'2',(selectt.amountfromsalestwheret.month=Tandt.year=sales.year)'3',(selectt.amountfromsalestwheret.month='1'andt.year=sales.year)as'4'fromsalesgroupbyyear;12.Ê`ᦻë᪗⚪
ÎíîஹᨬïZc¼⊤5id,title,postuser,postdate,parentid§ᜓsql!"5droptableifexistsarticles;createtablearticles(idintautojncrementprimarykey,titlevarchar(50),postuservarchar(10),postdatedatetime,parentidintreferencesarticles(id));insertintoarticlesvalues(null&fᩩ998-10-1012:32:32,,null),(null&©ᩩð998-10-1012:34:321,null),(null&fᩩZ17¢£','1998-10-1012:35:32,1),(null/&©ᩩZ1¢£','1998-10-1012:36:32;2),(null,,&fᩩZ27¤¥','1998-10-1012:37:32',1),(null&fᩩZ37¢£'1998-10-1012:38:32,,1),(null&©ᩩZ2?¢£','1998-10-1012:39:32,2),(null&fᩩZ41¤¥','1998-10-1012:39:40',1);

106¹ᫀ5selecta.title,a.postuser,(selectmax(postdate)fromarticleswhereparentid=a.id)replyfromarticlesawherea.parentidisnull;KL5ñ|}ᵨᙠ⌱óᑡwᵨwhereḄ½õᩩö÷ᵨfromr"஺13.ᑤ◀◀id5D9ᐸHIDḄJKᑍMN2.y⊤᝞ø5idooùnoùúᑖᦪ120050010001ᦪ6922005002¢£0001ᦪ89320050010001ᦪ69A:deletefromtablenamewhereidonotin(selectmin(ido)fromtablenamegroupbyo

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ᨬ5678ᑤ◀Ḅᩩ:ᦪ<஺deletefromstudent2whereidnotin(selectmidfrom(selectmin(id)midfromstudent2groupbyname)ast);ᡈὅdeletefromstudent2whereidnotin(selectmin(id)from(select*fromstudent2)astgroupbyt.name);

10714.?@AḄBC?DEF⚪⊤᪀᝞flight{flightlD,StartCitylD,endCitylD,StartTime}city{citylD,CityName)HIJ᛻createtablecity(citylDintautojncrementprimarykey,cityNamevarchar(20));createtableflight(flightIDintautojncrementprimarykey,StartCityIDintreferencescity(citylD),endCitylDintreferencescity(citylD),StartTimetimestamp);஻?DLᩭNOᨵPQRᑖST
☢Ḅ⚪UV1WXᑮZPQinsertintocityvalues(null,'ᓅ\]^_`')cinsertintoflightvalues(null,1,2,'9:37:23'),(null,1,3,'9:37:23'),(null,1,2,90:37:23'),(null,2,3c10:37:23');1ஹEFefghᓅ\Ḅᡠᨵ?D
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ᨬ{ᡃ|&}~wx3ᩭ஺ᔜC⊤(ᔠ3ᩭḄ1m1ᒹᡠᨵrsḄm஺select*fromflightf,citycwheref.endcityid=c.cityidandstartcityid=(selectc1.cityidfromcityc1whered.cityname="4ᓃ\")orderbyc.citynameasc;mysql>selectflight.flightid,'Jᓃ\'startcity,e.citynamefromflight,cityewhereflight.endcityid=e.cityidandflight.startcityid=(selectcityidfromcitywherecityname='ᓃ\');mysql>selectflight.flightid,s.cityname,e.citynamefromflight,citys,cityewhereflight.startcityid=s.cityidands.cityname=4ᓃ\'andflight.endCityld=e.cityIDorderbye.cityNamedesc;2ஹEFᓅ\ᑮ]^Ḅᡠᨵ?D(efgh
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108andc1.cityName=!ᓃ\'andc2.cityName=']^'3ஹEFᐹᜩ(2005-5-8)Ḅᓅ\ᑮ]^ḄḄ?Dᦪselectcount(*)from(selectc1.CityName,c2.CityName,f.StartTime,f.flightlDfromcityc1,cityc2,flightfwheref.StartCitylD=c1.citylDandf.endCitylD=c2.citylDandc1.cityName='dᓃ\'andc2.cityName=']^'andEḄCPQᜐᳮᦪ(startTime)like2005-5-8%'mysql1PQRᑖ¡¢Ḅx£¤ṹ᝞select*fromflightwheredate_format(starttimec%Y-%m-%d,)=1998-01-02'15.E3¡¥ᳮ¦§¨©Ḅᕒ«¬Droptableifnotexistsemployees;createtableemployees(idintprimarykeyautojncrement,namevarchar(50),salaryint,manageridintreferencesemployees(id));insertintoemployeesvalues(nullclhm\10000,null),(nullczxx\15000,1),(null,'fix',9000,IJXnull.'tg',10000,2),(null,'wzg',10000,3);Wzgᜧ"flxjhmᜧ"zxx¯⚪°±᪷m.salary;16ஹÏ3Ð"45ÑḄᔜCὁÓᡠÔḄᜧ"12ÑḄÕÖ×ᦪᦪ<Ø1ᨵ3C⊤teacher⊤»student⊤»tea_stuᐵÚ⊤஺teacher⊤tealDnameagestudent⊤stulDnameageteacher_student⊤tealDstulD⌕ÏᵨᩩsqlEF3»᪵Ḅ1.wxḄm⌕ᨵὁÓname,ageÝCὁÓᡠÔḄÕÖ×ᦪ

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ᡃ~✌ᐜé⌕$ᑮî◀“ᚗÍ”¬HIïᜓdroptableifexiststea_stu;droptableifexiststeacher;droptableifexistsstudent;createtableteacher(tealDintprimarykeynamevarchar(50),ageint);createtablestudent(stulDintprimarykeynamevarchar(50),ageint);createtabletea_stu(tealDintreferencesteacher(tealD),stulDintreferencesstudent(stulD));insertintoteachervalues(1,'zxx',45),(2clhm',25),(3,'wzg',26),(4,'tg',27);insertintostudentvalues(1,'wy',11),(2,'dh',25),(3,'ysq',26),(4,'mxc',27);insertintotea_stuvalues(1,1),(1,2),(1,3);insertintotea_stuvalues(2,2),(2,3),(2,4);insertintotea_stuvalues(3,3),(3,4),(3,1);insertintotea_stuvalues(4,4),(4,1),(4,2),(4,3);23,32,43¯⚪°±(åH☢ðñ⚪
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◀ᣵ12Ḅᯠ⊤studentᐵὶᑮ12!"#$%&'⊤ᒆ◀)ṹ+selecttea_stu.teaid,count(*)totalfromstudent,tea_stuwherestudent.stuid=tea_stu.stuidandstudent.age>12groupbytea_stu.teaid3.-Ḽ$/☢Ḅ123ᡂ5⊤teacherᐵὶ6◀ᜧ45Ḅὁ9selectteacher.teaid,teacher.name,totalfromteacher,(selecttea_stu.teaid,count(*)totalfromstudent,tea_stuwherestudent.stuid=tea_stu.stuidandstudent.age>12groupbytea_stu.teaid)astea_stu2whereteacher.teaid=tea_stu2.teaidandteacher.age<45;17.OPQRᨬTḄUVselectauthorid,count(*)totalfromarticlesgroupbyauthoridhavingtotal=(selectmax(tota!2)from(selectcount(*)total2fromarticlesgroupbyauthorid)ast);

110selectt.authorid,max(t.total)from(selectauthorid,count(*)totalfromarticles)ast;ᩩ=>?@AmaxBᨵDᑡ?ᐸGᑡHI஺selectauthorid,count(*)totalfromarticlesgroupbyauthoridhavingtotal=max(total)K?஺18ஹDMᵨᡝ⊤ᨵDMPᑖRSᎷ᝞ᦪWXᨵ100YZMᵨᡝ[⌕ᙠ^_`DᜩbᨌdPᑖefgdὃ⇋jkgdljkmnopqaltertabledropcolumnscore;altertableaddcolunmscoreint;rstuv◤⌕xyxy?z{Ḅ|᛻ᩭᑐ6⌕;᪵ḄnḄᙠᡃḄᓺBᨵinertupdatedeleteDML=>createtable,droptable,altertableDDL=>?஺opᫀDupdateusersetscore=0;opᫀᎷ/☢Ḅ)ṹ⌕᡻ᡃḄᡃaltertableuserdropcolumnscore;altertableuseraddcolumnscoreint஺"☢)ṹ^_ḄMbᨌef஺Runnablerunnable=newRunnable(){publicvoidrun(){clearDb();schedule(this,newDate(newDate().getYear()+1,0,0));)}¡schedule(runnable,newDate(newDate().getYear()+1,0,1));

11119ஹDMᵨᡝᐹᨵYM£⁐¥¦§⊤ᐹᨵᵨᡝḄᡠᨵ£⁐ḄᐸGᵨᡝ஺selectcount(*)asnum,tb.idfromtb,(selectrolefromtbwhereid=xxx)ast1wheretb.role=tl.roleandtb.id!=t1.idgroupbytb.idhavingnum=selectcount(role)fromtbwhereid=xxx;20.xxx©ªḄsql☢xTableEMPLOYEESStructure:EMPLOYEEJDNUMBERPrimaryKey,FIRST.NAMEVARCHAR2(25),LAST_NAMEVARCHAR2(25),Salarynumber(8,2),HiredDateDATE,Departmentidnumber(2)TableDepartmentsStructure:Departmentidnumber(2)PrimaryKey,DepartmentNameVARCHAR2(25).(2)«/¬EMPLOYEE⌕ᑏ¦§+ᑏ®ᵨ¯°ᙠ±_Ḅᡈὅ´µᙠ[1000,2000]¶Ḅᡈὅᕒ´¸¹(last_name)!‘ObamaᡭᜮḄᡠᨵᕒ´ᑡ;¾ᕒ´ḄᐰÀMÁÂÃ஺(4ᑖ)select*fromemployeeswhereYear(hiredDate)=Year(date())or(salarybetween1000and200)orleft(last_name,3)=,abc';(3)«/¬EMPLOYEESᑏ¦§+¦ÀÅÆᙳ´µᜧ1800ᐗḄÀÅḄᡠᨵᕒ´ᑡ;¾ᕒ´ḄᐰÀMÁÂÃ஺(4ᑖ)mysql>selectid,name,salary,deptiddidfromemployeelwhere(selectavg(salary)fromemployeelwheredeptid=did)>1800;(4)«/¬EMPLOYEEnᑏ¦§+¦MÁ´µÉᐸᡠᙠÀÅÆᙳ´µḄᕒ´ஹᑡ;¾ᕒ´ḄᐰÀMÁÂÃÊᕒ´´µÉÀÅÆᙳ´µËᑖÌ஺(5ᑖ)selectemployeel.*,(employeel.salary-t.avgSalary)*100/employee1.salaryfromemployeel,(selectdeptid,avg(salary)avgSalaryfromemployeelgroupbydeptid)astwhereemployeel.deptid=t.deptidandemployeel.salary>t.avgSalary;

11221ஹÍJdbcÎÏÐÑḄÒÓÔ22ஹᵨJDBC᝞ÕÖᵨ×ØÙÐ)ṹ᝞"+packagecom.huawei.interview.lym;importjava.sql.CallableStatement;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.Types;publicclassJdbcTest{/**“@paramargs7publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubConnectioncn=null;CallableStatementcstmt=null;try(஻;Ûᨬ?⌕;kÝ@AÎϹᑏÞᙠÐÑßClass.forName("com.mysql.jdbc.Driver");//▭⚗ã;Û
ᵨDataSourceᦪW᝞2ᵨ᪾å//;MᦪWæ?◤⌕ᡃçṹèéᡃB◤Datasourceds=context.lookup()//cn=ds.getConnection();cn=DriverManager.getConnection("jdbc:mysql:///test","roor,"rootH);cstmt=cn.prepareCall("{callinsert_Student(?,?,?)}'*);cstmt.registerOutParameter(3,Types.INTEGERcstmt.setString(1,"wangwu");cstmt.setlnt(2,25);cstmt.execute();//get`êM?ëḄᦪWX?D᪵éì?ᑏSystem.out.println(cstmt.getString(3));}catch(Exceptione){//TODOAuto-generatedcatchblocke.printStackTrace();

113)finally(/*try{cstmt.close();}catch(Exceptione){}try{cn.close();}catch(Exceptione){}*/try{if(cstmt•=null)cstmt.close();if(cn!=null)cn.close();}catch(SQLExceptione){//TODOAuto-generatedcatchblocke.printStackTrace();)23'JDBCḄPreparedStatementíÌStatementḄᜐï+DMsqlðñòóôõᘤ÷᡻ḄøùA+=nú¦=ûᑖ᪆çýᡂᑁÀᢣ
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©☢ËÌḄÍÎᦪ7ÈḄᑖ⚓sqlAsqlserver:Stringsql="selecttop"+pageSize+n*fromstudentswhereidnotin"+"(selecttop"+pageSize*(pageNumber-1)+nidfromstudentsorderbyid)"+"orderbyid";mysql:Stringsql="select*fromstudentsorderbyidlimit"+pageSize*(pageNumber-1)++pageSize;oracle:Stringsql="select*from"+(select*,rownumridfrom(select*fromstudentsorderbypostimedesc)whererid<="+pagesize*pagenumber+")astH+"wheret>"+pageSize*(pageNumber-1);27ஹᵨJDBC´µÏÐᡂÒᓫ
ÔË⌕9ṹᑏnᩭὃÕᭆ᳛᩽ᜧ.Connectioncn=null;PreparedStatementpstmt=null;Resultsetrs=null;try{Class.fomame(driveClassName);cn=DriverManager.getConnection(url,username,password);pstmt=cn.prepareStatement("selectscore.*fromscore,student+

115"wherescore.stuld=student.idandstudent.name=?”)Ûpstmt.setString(1,studentName);Resultsetrs=pstmt.executeQuery();while(rs.next())(system.out.println(rs.getlnt("subject")+“”+rs.getFloat("score"));}}catch(Exceptione){e.printStackTrace();}finally(if(rs!=null)try{rs.close()}catch(exceptione){}if(pstmt!=null)try{pstmt.close()}catch(exceptione){}if(cn!=null)try{cn.close()}catch(exceptione){})28ஹpÜ9ṹᨵ>¡ÝÞᜐ?try(Connectionconn=Statementstmt=ResultSetrs=stmt.executeQuery("select*fromtable1");while(rs.next()){)}catch(Exceptionex){)@:áᨵfinally²³ᩭᐵãᔜ0_`
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ᦪᙠXMLᦻ஺3ஹᵨjdom᪆xmlᦻ᝞!ᦻ"⚪$᝞᪆$%:'᝞()ṹᵨ+ṹ,-!packagetest;importjava.io.*;publicclassDOMTest{privateStringinFile=''ciWpeople.xml"privateStringoutFile=nc:\\people.xmlHpublicstaticvoidmain(Stringargs[]){newDOMTest();)publicDOMTest(){try{javax.xml.parsers.DocumentBuilderbuilder=javax.xml.parsers.DocumentBuilderFactory.newlnstance().newDocumentBuilder();org.w3c.dom.Documentdoc=builder.newDocument();org.w3c.dom.Elementroot=doc.createElement("ὁ1”)3org.w3c.dom.Elementwang=doc.createElement("4");org.w3c.dom.Elementliu=doc.createElement("ᦻij");wang.appendChild(doc.createTextNode(Hᡃ84ὁ1”))3root.appendChild(wang);doc.appendChild(root);javax.xml.transform.Transformertransformer=javax.xml.transform.TransformerFactory.newlnstance().newTransformer();transformer.setOutputProperty(javax.xml.transform.OutputKeys.ENCODING,"gb2312");transformer.setOutputPropertyGavax.xml.transform.OutputKeys.INDENT,"yes");transformer.transform(newjavax.xml.transform.dom.DOMSource(doc),newjavax.xml.transform.stream.StreamResult(outFile));}catch(Exceptione){System.out.println(e.getMessage());})}

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135Ḅ_ᙢabᑁCOM+,c)deBfabghḄ஺EnterpriseJavaBeanYZDCOMᓽᑖkl+,஺c)mJavaḄnbopqᵨHRMIᢈsḄᡠEJBBnbghHfabஹftuvw஺xEJByzBk{ᙠ|᝞WebspereஹWebLogic}᪵ḄCᘤ^EJBᡝdTghḄEJB+,)=ᐸCᘤgh஺EJBCᘤ)EJB+,ḄᳮEJB+,ᵫCᘤᡠFGᳮ஺ᡝ=CᘤᩭghḄEJB+,஺4ஹEJBᒹHSessionBean,EntityBeanwḄᕜ᝞9ᳮḄSessionBean:StatelessSessionBeanḄᕜ)ᵫCᘤḄZᡝv⌕G$&BeanḄREJBCᘤd$⌕FG$&ḄBeanḄRᡝvqᵨ)¡¢£$&SᨵḄR¤¥ᡝv஺Zᡝv¦$§qᵨ$&StatefulSessionBeanCᘤyzᓽᙠ¨ᘤ^FG$&ḄBeanR.ᐵὶᑮᡝv7¬ᡝvqᵨStatefulSessionBeanḄopCᘤ®qᵨᑖ¯ᑮᡝvYᐵὶḄBeanR஺EntityBean:EntityBeanse°Y-±Ḅ².³᝱)ᢝ´Ḅ஺µ⌕ᦪ·¸^Ḅᦪ·ᙠEntitybeans¹$°஺d)ᢥ᯿Jᵨb¼ᡈὅ¨abᩭḄ஺ᓽEJBCᘤ¾¿ÀEntitybeansÁ)°Ḅ஺EntityBeansᕜeÂBCᘤᡈὅBeansÃÄᳮ஺EJB=%ᢈsᳮRÅ-Æᳮ+ÇHOMQḄ-ÆR¨HOTSSunMicrosystemsḄTransactionServiceHJTS-JavaTransactionAPIJTAÈ+HX/OpenwḄXATU஺5ஹEJBCᘤ¤Ḅ¨É⌕¤ÊËᕜᳮஹṹÍஹᢝ´ឋᳮஹÎᐰஹᳮஹ┝.ÑᳮÒ¨஺6ஹEJBḄÓ°vᑴStatefulSessionBeanÕÅᐸCacheᜧ×Àᑁ^ØᙠḄBeanRḄᦪÙ᪷·MRUᡈNRUWpRᙠÓ°ÛÓ°᝱ܲÝÞÓ°vᑴ)Zᡝßqᵨà&EJBRáop᝞â-JEJBObjectSÃÄ/ᨵã-JḄBeanRᑣᐸÛÓ°Beanå^H=¼ᑡᓄvᑴåRwè*HÓ°wR஺᝱éÝêqᵨ-JḄejbActiveejbPassivateop஺7ஹEJBḄëì:]íHSessionwBeanRîHEntitywBeanïðñḄHMessageDrivenwBeaníBeanòᑖÕᨵ᝱HStatefulwL᝱HStatelesswóì

136RîBeanᑖÕBeanᳮḄᢝ´ឋ(BMBCᘤᳮḄᢝ´ឋ(CMBóì8ஹ¨ßqᵨEJB-ÆḄë&m_õö÷øJNDI¨ùᔆJNDI¨ᙢᙬüýþឋÿHome
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1383ஹtuvwxJAVAy8zᵯ1☢|⚪~1.Talkaboutoverriding,overloading.2.TalkaboutJAVAdesignpatternsyouknown.3.TalkaboutthedifferencebetweenLinkList,ArrayListandVictor.4.TalkaboutthedifferencebetweenanAbstractclassandanInterface.5.Classa=newClass();Classb=newClass();if(a==b)returnstrueorfalse,why?6.WhyweuseStringBufferwhenconcatenatingstrings?7.TrytoexplainSingletontous?Isitthreadsafe?Ifno,howtomakeitthreadsafe?8.Trytoexplainloc?9.Howtosetmany-to-manyrelationshipinHibernate?10.TalkaboutthedifferencebetweenINNERJOINandLFETJOIN.11.Whyweuseindexindatabase?Howmanyindexesisthemaximuminonetableasyoursuggestion?12.When'Final'isusedinclass,methodandproperty,whatdoseitmean?13.DoyouhaveanyexperienceonXML?TalkaboutanyXMLtoolyouused,e.g.JAXB,JAXG.

13914.DoyouhaveanyexperienceonLinux?15.InOODwhatisthereasonwhenyoucreateaSequencediagram?Administrator10:34:201ᚮ᪘ḄMNᨵ64kḄ&ᑮᚮ=&ᑮ᪘=2᎛ᵨᑮ᎛ᵨᑮdὅMN3ᨵ100ḄᦪᨵRḄ᝞ᑮ஺4
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