个的笔试题阿里巴巴网络技术

1.1.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?3.i=9.publicvoidamethod()}}27.publicclassDerivedextendsBi=-1;35.publicstaticvoidmain(Stringargv[])Baseb=newWhichWhichisthemostappropriatecodesnippetthatcanbeinsertedatline18inthefollowingcode?(Assumethatthecodeiscompiledandrunwithassertionsenabled)5.1.import7.9.3.publicclass11.4.}publicvoid}Derived.amethod()Derived.amethod()-1Derived.amethod()99piletimeerrorprivateHashMappublic{cctld=newcctld.put("uk","United//more}33.15. //othermethods35.16. publicStringgetCountry(StringcountryCode) 39.18. //Whatshouldbeinsertedhere?41.19. Stringcountry=(String)cctld.get(countryCode); return 47.22.assertassertcountryCode!=assertcountryCode!=null:"Countrycodecannotbenull"assertcctld!=null:"Nocountrycodedataisassertcctld:"NocountrycodedataisWhatwillbetheresultofexecutingthefollowingbooleana=booleanb=booleanc=if(a==true)if(b==if(c== System.out.println("SomethingsaretrueinthisSystem.out.println("Nothingistrueinthiselseif(a&&(b=c))System.out.println("It'stooconfusingatislwhatistrueand10.elseSystem.out.println("Heythiswon'tcompile"); A.Thecodewon'tB."Somethingsaretrueinthisworld"willbeC."Heythiswon'tcompile"willbeD.Noneof4:Aclassdesignrequiresthatamembervariableshouldbeaccessibleonlybysamepackage,whichmodiferwordshouldbeused?C.nomodifer5:Whichisthemain()methodreturnofaGivenGiventhefollowingclassclassprotectedintA(int}}whichofthefollowingwouldbeavalidinnerclassforthisSelectvalidclassclassB{classBextendsA{classBextendsA{B(){System.out.println(“i=”+i);}classB{classA{}1.Strings=”ExampleString”;Whichoperationisnot D.importD.importjava.io.*;importjava.awt.*;publicclassTest{//do10:Whichofthefollowingstatementsare{//dosomething...}publicclassTest{//doC.importjava.io.*;A.inti=s.length();C.StringD.String9:WhichfragmentsarenotcorrectinJavasourceA.packagetestpackage;publicclassTest{//doB.importjava.io.*;packagetestpackage;publicclassTest{//doeseseligibleforgarbagecollectionwhenallreferencesdenotingitD.AnsettoC.Garbagecollection tformB.AprogramcansuggestthatgarbagecollectionbeperformedA.TheautomaticgarbagecollectionoftheJVMpreventsprogramsfromeverrunningof1.1.Whatresultsfromattemptingtocompileandrunthefollowingcode?3.publicclassTernary5.7.publicstaticvoidmain(Stringargs[])9.11.inta=5;13.System.out.println("Valueis-"+((a<5)?9.9:9));A.prints:A.prints:Valueis-pilationC.prints:Valueis-D.NoneofGivethefollowingjavasource//pointpublicclass//do//do}WhichstatementiscorrectlyJavasyntaxatpointpublicpublicclassMyClass{//dootherstaticintclassMyClass{//dosomething…}1.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?3.(Assumethatthecodeiscompiledandrunwithassertionsenabled.)5.publicclassAssertTest{7.publicvoidmethodA(inti){9.asserti>=0:methodB();15.publicvoidmethodB(){17.System.out.println("Thevaluemustnotbenegative");21.publicstaticvoidmain(Stringargs[]){23.AssertTesttest=newAssertTest();ititwillprint-itwillresultinAssertionErrorshowingthemessage-“thevaluemustnotbethecodewillnotNoneofGiveGivethecodeelseifelseWhichrangeofvaluexwouldproduceofoutput“Test 下（不能用C/C++中的函数或类） 20:C/C++源代码中，检查花括弧“（”“）”，“{”与“}”）是否匹配，若不匹配，则输出不匹配花21:Java程序，程序中要进行数组操作和除法操作，要求对所设计的程序可能出现22:Hashtabl