java双语教学考试试卷及答案a

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1、班级学号姓名密封装订线密封装订线密封装订线A卷注意事项：请将各题答案按编号顺序填写到答题卷上，答在试卷上无效。一、单项选择题（1~20每小题1分，21~30每小题2分，共40分）1.WhicharekeywordsinJava?A.NullB.TRUEC.sizeofD.implements2.Considerthefollowingcode:Integers=newInteger(9);Integert=newInteger(9);Longu=newLong(9);Whichtestwouldreturntrue?A.(s.equ

2、als(newInteger(9))B.(s.equals(9))C.(s==u)D.(s==t)3.Whichstatementofassigningalongtypevariabletoahexadecimalvalueiscorrect?A.longnumber=345L;　　B.longnumber=0345;C.longnumber=0345L;D.longnumber=0x345L;4.Whichlayoutmanagerisusedwhentheframeisresizedthebuttons'spositionint

3、heFramemightbechanged?A.BorderLayout　　B.FlowLayout　　C.CardLayout　　D.GridLayout5.WhicharenotJavaprimitivetypes?A.short　　B.Boolean　　C.byte　　D.float6.Giventhefollowingcode:　　if(x>0){System.out.println("first");}　　elseif(x>-3){System.out.println("second");}　　else{System.ou

4、t.println("third");}Whichrangeofxvaluewouldprintthestring"second"?　　A.x>0　　B.x>-3　　C.x<=-3　　D.x<=0&x>-37.Giventhefollowingcode:publicclassPerson{intarr[]=newint[10];publicstaticvoidmain(Stringa[]){　　System.out.println(arr[1]);　　}}面向对象程序设计（JAVA）第18页共18页Whichstatementisc

5、orrect?A.Whencompilationsomeerrorwilloccur.B.Itiscorrectwhencompilationbutwillcauseerrorwhenrunning.C.Theoutputiszero.D.Theoutputisnull.1.Shortanswer:Thedecimalvalueofiis13,theoctalivalueis:A.14B.015C.0x14D.0122.ApublicmembervairablecalledMAX_LENGTHwhichisinttype,theva

6、lueofthevariableremainsconstantvalue100.Useashortstatementtodefinethevariable.A.publicintMAX_LENGTH=100;　　B.finalintMAX_LENGTH=100;C.finalpublicintMAX_LENGTH=100;　D.publicfinalintMAX_LENGTH=100.3.WhichcorrectlycreateanarrayoffiveemptyStrings?A.Stringa[]={"","","","",""

7、,""};B.Stringa[5];C.String[5]a;D.String[]a=newString[5];for(inti=0;i<5;a[i++]=null);4.Giventhefollowingmethodbody:{if(sometest()){unsafe();}else{safe();}}Themethod"unsafe"mightthrowanIOException(whichisnotasubclassofRunTimeException).Whichcorrectlycompletesthemethodofd

8、eclarationwhenaddedatlineone?A.publicvoidmethodName()throwsExceptionB.publicvoidmethodname()C.publicvoidmethodName()t