SCJP认证考试题集.doc

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1、310-055SCJIP认证考试题集Question1Given:11.publicinterfaceStatus{12./*insertcodehere*/intMY_VALUE=10;13.}Whichthreearevalidonline12?(Choosethree.)A.finalB.staticC.nativeD.publicE.privateF.abstractG.protectedAnswer:ABDQuestion2Given:10.publicclassBar{11.staticvoidfoo(int...x){12.//insertcodehere13.}14.}Wh

2、ichtwocodefragments,insertedindependentlyatline12,willallowtheclasstocompile?(Choosetwo.)A.foreach(x)System.out.println(z);B.for(intz:x)System.out.println(z);abcdC.while(x.hasNext())System.out.println(x.next());D.for(inti=0;i

3、lassTest{12.publicstaticvoidmain(String[]args){13.intx=5;14.booleanb1=true;15.booleanb2=false;16.17.if((x==4)&&!b2)18.System.out.print(”l“);19.System.out.print(”2“);20.if((b2=true)&&b1)21.System.out.print(”3“);22.}23.}Whatistheresult?A.2B.3C.12D.23E.123F.Compilationfails.G.Auexceptionalisthrownatr

4、untime.Answer:DQuestion44.Given:31.//somecodehere32.try{33.//somecodehere34.}catch(SomeExceptionse){35.//somecodehere36.}finally{37.//somecodehere38.}Underwhichthreecircumstanceswillthecodeonline37beexecuted?(Choosethree.)A.Theinstancegetsgarbagecollected.B.Thecodeonline33throwsanexception.C.Theco

5、deonline35throwsanexception.D.Thecodeonline31throwsanexception.E.Thecodeonline33executessuccessfully.Answer:BCElQuestion5Given:10.interfaceFoo{}11.classAlphaimplementsFoo{}12.classBetaextendsAlpha{}13.classDeltaextendsBeta{14.publicstaticvoidmain(String[]args){15.Betax=newBeta();16.//insertcodeher

6、e17.}18.}Whichcode,insertedatline16,willcauseajava.lang.ClassCastException?A.Alphaa=x;B.Foof=(Delta)x;C.Foof=(Alpha)x;D.Betab=(Beta)(Alpha)x;Answer:BQuestion6Given:?disavalid,non-nullDateobject?dfisavalid,non-nullDateFormatobjectsettothecurrentlocaleWhatoutputsthecurrentlocalescountrynameandtheapp

7、ropriateversionofd’sdate?A.Localeloc=Locale.getLocale();System.out.println(loc.getDisplayCountry()+““+df.format(d));B.Localeloc=Locale.getDefault();System.out.println(loc.getDisplayCountry()+““+df.format(d));C.Lo