SCJP模拟题 AND Answer [1]

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1、Question1:Whichofthefollowingclassdefinitionsdefinesalegalabstractclass?Selectallrightanswers.a)classAnimal{abstractvoidgrowl();}b)abstractAnimal{abstractvoidgrowl();}c)classabstractAnimal{abstractvoidgrowl();}d)abstractclassAnimal{abstractvoidgrowl();}e)abstractclassAnimal{abstractvoid

2、growl(){System.out.println("growl");}}Question2:ForanobjecttobeatargetforaThread,thatobjectmustbeoftype:Fillintheblank.Question3:WhatistheproperwayofdefiningaclassnamedKeysothatitcannotbesubclassed?a)classKey{}b)abstractfinalclassKey{}c)nativeclassKey{}d)classKey{final;}e)finalclassKey{

3、}Question4:WhatmodesarelegalforcreatinganewRandomAccessFileobject?Selectallvalidanswers.a)"w"b)"r"c)"x”d)"rw"e)"xrw"Question5:Giventhefollowingcode:classTester{publicstaticvoidmain(String[]args){CellPhonecell=newCellPhone();cell.emergency();}}classPhone{finalvoiddial911(){//codetodial91

4、1here...}}classCellPhoneextendsPhone{voidemergency(){dial911();}}WhatwillhappenwhenyoutrytocompileandruntheTesterclass?a)ThecodewillnotcompilebecausePhoneisnotalsodeclaredasfinal.b)Thecodewillnotcompilebecauseyoucannotinvokeafinalmethodfromasubclass.c)Thecodewillcompileandrunfine.d)Thec

5、odewillcompilebutwillthrowaNoSuchMethodExceptionwhenTesterisrun.e)PhoneandCellPhonearefine,butTesterwillnotcompilebecauseitcannotcreateaninstanceofaclassthatderivesfromaclassdefiningafinalmethod.Question6:Whichassignmentsarelegal?Selectallvalidanswers.a)longtest=012;b)floatf=-412;c)into

6、ther=(int)true;d)doubled=0x12345678;e)shorts=10;Question7:Giventhisclassdefinitions:abstractclassTransactionimplementsRunnable{}classDepositextendsTransaction{protectedvoidprocess(){addAmount();}voidundo(inti){System.out.println("Undo");}}Whatwillhappenifweattemptedtocompilethecode?Sele

7、cttheonerightanswer.a)Thiscodewillnotcompilebecausetheparameteriisnotusedinundo().b)Thiscodewillnotcompilebecausethereisnomain()method.c)ThiscodewillnotcompilebecauseDepositmustbeanabstractclass.d)ThiscodewillnotcompilebecauseDepositisnotdeclaredpublic.e)Everythingwillcompilefi