廣州競(jìng)遠(yuǎn)系統(tǒng)網(wǎng)絡(luò)技術(shù)

1:ConsidertheclasshierarchyshownclassFourWheelerimplementsclassCarextendsclassTruckextendsclassBusextendsclassCraneextendsConsiderthefollowingcode2.FourWheelerTruckmyTruck=new4.du=5.fw=new6.fw=WhichofthestatementsbelowareLine4willnotcompilebecauseaninterfacecannotrefertoanThecodewillcompileandThecodewillnotcompilewithoutan atline6,becausegoingdownhierarchywithoutcastingisnotD.TheD.Thecodewillcompileutanatline6butwillthrowanexceptionD.ThevariableshouldhavenospecialaccessC.ThevariableshouldbemarkedB.Thevariableshouldbemarked2:Aclassdesignrequiresthataparticularmembervariablemustbeaccessiblefordirectaccessbyanysubclassesofthisclass.butotherwisenotbyclasseswhicharenotmembersofthesamepackage.Whatshouldbedonetoachievethis?A.Thevariableshouldbemarked1.Inthefollowingcode,whichistheearlieststatement,wheretheobjectoriginallyheldne,maybegarbage1.publicclassTest2.publicstaticvoidmain(Stringargs[])Employeee=newEmployee("Bob",6.18.e=e=newEmployee("Denise",36);3.OnlyA.LineA.LineB.LineC.LineC.LineD.Line4:Whichisthemain()methodreturnofa5:以下的C程序代碼片段運(yùn)行后CdInta=1,b=2;Intc,d;cd=(a&&b)&a;6:Whichofthefollowingansweriscorrecttoexpressthevalue8inoctal1.1.Whatwillbetheresultofexecutingthefollowingcode?3.//Filename;SuperclassX.tectedvoidsuperclassMethodX()13.15.17.intsuperclassVarX;19.23.//FilenameSubclassY.java25.1.packagepackageX.packageY;27.29.3.publicclassSubclassYextendsSuperclassX31.33.5.SuperclassXobjX=newSubclassY();35.6.SubclassYobjY=newSubclassY();37.7.voidsubclassMethodY()39.43.10.inti;45.11.i=objY.superclassVarX;47.49.51.pilationpilationerroratline5pilationerroratlineC.RuntimeexceptionatlineD.Noneof1.1.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?3.publicclassSx=5;13.15.staticintx,y;17.publicstaticvoidmain(Stringargs[])19.27.x--System.out.println(x+y+29.publicstaticvoidmyMethod()31.33.y=x+++9.printsprints:prints:prints:prints:9:Whichofthefollowingstatementsarenotlongl=inti=doubled=doublet=Givethefollowingjavapublicclassstaticintx[]=newpublicstaticvoidmain(String}}WhichstatementisA.WhenA.Whencompile,someerrorwillB.Whenrun,someerrorwillC.OutputisD.OutputisA.inti=100while(1){i=i%100+1;if(i>100)break;B.forB.forC.intk=1000;do{++k;D.ints=36;while(s);--1)publicvoidcreate() Vector myVect=new4)第二行第二行 WhathappenswhenyoutrytocompileandrunthefollowingclassStringpublicstaticvoidmain(String[]Mysterym=new}void}void}}thisthiscodecomplilesbutthrowsanexceptionatthiscoderunsbutnothingappearsinthestandardthiscoderunsand“constructor”inthestandardD.thisD.thiscoderunsandwrites”null”inthestandard14:WhichstatementaboutlistenerisA.MostcomponentallowmultiplelistenerstobeB.Ifmultiplelistenerbeaddtoasinglecomponent,theeventonlyaffectedonelistener.ponentdon?tallowmultiplelistenerstobeadd.16:Whatiswrittentothestandardoutputgiventhefollowingstatement:System.out.println(4|7);Selecttherightanswer:18:JDBC 20:Security公司的網(wǎng)絡(luò)管理工程師Mr.leak最近發(fā)現(xiàn)有不少來自公司外部IP的請(qǐng)求，試圖非 Ipv4上的 ，如果請(qǐng)求來自非 的ip地址，則將請(qǐng)求丟棄。為了便于管理，通過文本文件IP.TXT來配置 的IP地址，文件格式為每行（’/n’）一個(gè)IP地址（或IP段），范圍不超過一個(gè)B類。例如：權(quán)范圍內(nèi)，則在標(biāo)準(zhǔn)輸