stdOut.println（i+j）;
}}
（a）6
（b）4
（c）3
（d）5
Correctansweris（c）
7.WhichofthefollowingstatementsaboutclassvariablesinJavaisnottrue?
（a）Classvariablesrequirethemodifierstaticinthedeclarations.
（b）Allobjectshavetheirowncopyoftheclassvariabledefinedintheinstantiatedclass.
（c）Non-staticmethodsinaclasscanaccesstheclassvariabledefinedinthesameclass.
（d）Classvariablesdonotneedthereferencetotheobjectoftheinstantiatedclasstoaccessthem.
Correctansweris（b）
8.Thetermclassvariableisasynonymfor
（a）aninstancevariable
（b）aread-onlyvariable
（c）aprivatedatafield
（d）astaticdatafield
Correctansweris（d）
9.WhichofthefollowingpatternsofcharactersopensaJavadoccommentblock?
（a）/**
（b）//
（c）/*
（d）**/
Correctansweris（a）
2.Thetermwrapperclassesrefersto
（a）theJavaclassesthatcontainatleasttwodatafields
（b）theJavaclassesthatcontainthemselves
（c）acollectionofJavaclassesthat"wrap"Javaprimitivetypes
（d）acollectionofJavaclassesthatcontainotherJavaclasses
Correctansweris（c）
3.Giventhefollowingcode,whatvaluewillbeoutputbythelaststatement?
StringTokenizerst=newStringTokenizer（"thisis,a,testoftokens",","）;
Strings;
intcount=0;
while（st.hasMoreTokens（））{
s=st.nextToken（）;
++count;
}
stdOut.println（count）;
（a）3
（b）1
（c）6
（d）4
Correctansweris（a）
5.ConsiderthefollowingJavaprogramsegment.
intx=5;
inty=2;
System.out.println（x+"1"+y）;
Whichofthefollowingstatementsistrueabouttheprogramsegment?
（a）Theoutputcausedbythecodewillbe512.
（b）Theoutputcausedbythecodewillbe8.
（c）Thecodewillcauseacompilationerror.
（d）Theoutputcausedbythecodewillbe512.
Correctansweris（a）
6.ConsiderthefollowingJavaprogramsegment.
importjava.io.*;
publicclassSomeClass{
publicvoidx（）{
thrownewRuntimeException（"Exceptionfromx"）;
}
publicvoidy（）{
thrownewIOException（"Exceptionfromy"）;
}
}
Whichofthefollowingistrueconcerningthedefinitionsforthemethodsxandy?
（a）Neitherxnoryhasalegaldefinition.
（b）Bothxandyhavelegaldefinitions.
（c）xhasalegaldefinition,butyhasanillegaldefinition.
（d）xhasanillegaldefinition,butyhasalegaldefinition.
Correctansweris（c）
7.InJava,exceptionsthatarenothandledarepassedupthe
（a）exceptionladder
（b）callstack
（c）catchblocks
（d）blockhierarchy
Correctansweris（b）
10.Afteratypicaldebuggerencountersabreakpoint,theprogrammerusingthedebuggermayperformwhichofthefollowingactions?
1.Examinethevaluesofvariablesinthehaltedprogram
2.Executethecurrentline
3.Resumeexecutionofthehaltedprogram
（a）IIIonly
（b）I,II,andIII
（c）Ionly
（d）IandIIonly
Correctansweris（b）
1.ThenameofaJavasourcefile
（a）mustusetheextension.class
（b）mustbethesameastheclassitdefines,respectingcase
（c）mustbethesameastheclassitdefines,ignoringcase
（d）hasnorestrictions
Correctansweris（b）
5.Adifferencebetweenthemethodsprintandprintlnoftheclassjava.io.PrintWriteristhat
（a）printlnappendsanewlinetotheendofitsoutput,butprintdoesnot
（b）printappendsanewlinetotheendofitsoutput,butprintlndoesnot
（c）printlninsertsanewlineatthebeginningofitsoutput,butprintdoesnot
（d）printinsertsanewlineatthebeginningofitsoutput,butprintlndoesnot
Correctansweris（a）
6.WhatistherightwaytohandleabnormalitiesininputonJava?
（a）Byhandlingtheseproblemsbyprovidingexceptionhandlers
（b）ByalwaysspecifyingthethrowsclauseineverymethodheaderwherefileI/Oisperformed
（c）ByusingtheclassFileFilterwhichgracefullyfiltersoutbadinputdata
（d）Bywritingwhileloopstoguardagainstbadinput
Correctansweris（a）
7.AllJavaexceptionclassesarederivedfromtheclass
（a）java.lang.RuntimeException
（b）java.lang.Throwable
（c）java.lang.Error
（d）java.io.IOException
Correctansweris（b）
9.WhichofthefollowingstatementsistrueoftheconventionsoutlinedbySunMicrosystemsinthedocumententitledCodeConventionsfortheJavaProgrammingLanguage?
1.TheydefineastandardinterfacedefinitionlanguagethatmustbeusedforallJavaclasses.
2.Theyproviderecommendationsintendedtomakesourcecodeeasiertoreadandunderstand.
3.TheydescribeonemechanismfornetworkcommunicationbetweenJavaandC++programs.
（a）IIIonly
（b）I,II,andIII
（c）IIonly
（d）IandIIIonly
Correctansweris（c）
10.Atoolthatallowsprogrammerstoexecutelinesofaprogramonelineatatimeinordertohelplocatethesourceofaprogram'serrorsisknownasa（n）
（a）debugger
（b）stacktrace
（c）exceptionhandler
（d）scope
Correctansweris（a）
2.Whichofthefollowingisnottrueconcerningobjectsandtheirrepresentation?
（a）objectsarerepresentedbytheiraddresses
（b）objectsarerepresentedbyvalue
（c）objectsarerepresentedbyreference
（d）objectsarerepresentedindirectly
Correctansweris（b）
5.Inprogramming,aloopisgenerallyusedtoachieve
（a）branching
（b）succession
（c）repetition
（d）selection
Correctansweris（c）
7.Ifaclasscontainsaconstructor,thatconstructorwillbeinvoked
（a）eachtimeanobjectofthatclassgoesoutofscope
（b）onceatthebeginningofanyprogramthatusesthatclass
（c）oncethefirsttimeanobjectofthatclassisinstantiated
（d）eachtimeanobjectofthatclassisinstantiated
Correctansweris（d）
8.WhichofthefollowingcategorizationscanbeappliedtoboththedatafieldsandthemethodsinaJavaclass?
（a）nativeandnon-native
（b）staticandnon-static
（c）defaultandnon-default
（d）abstractandnon-abstract
Correctansweris（b）
10.AccordingtotheJavacodeconventions,filesthatcontainJavasourcecodehavethesuffix_____,andcompiledbytecodefileshavethesuffix_____.
（a）.javac,.class
（b）.java,.class
（c）.class,.javac
（d）.class,.java
Correctansweris（b）
2.Variablesofprimitivetypesarealsoreferredtoas
（a）references
（b）classes
（c）objects
（d）scalars
Correctansweris（d）
3.Basedonthefollowingdeclaration,whatdoesb1representjustafterthedeclarationisexecuted?
Buttonb1;
（a）a"default"Buttonobject
（b）aButtonobjectwithnolabel
（c）ablankButtonobject
（d）nothing
Correctansweris（d）
8.Thereturntypeforamethodthatreturnsnothingtoitscalleris
（a）notspecifiedinthemethoddefinition
（b）false
（c）null
（d）void
Correctansweris（d）
2.Whatisthenameofthewrapperclassforthetypeint?
（a）Integer
（b）INT
（c）integer
（d）Int
Correctansweris（a）
3.Whichofthefollowingstatementsis（are）trueabouttheuseofanast
升级会员 