2025年java英文面試題及答案

一、單項選擇題（每題2分，共10題）

1.WhichofthefollowingisnotaprimitivedatatypeinJava?

A.int

B.String

C.double

D.boolean

2.WhatisthedefaultaccessmodifierforaclassmemberinJava?

A.public

B.private

C.protected

D.default(package-private)

3.WhichofthefollowingisnotacollectionframeworkinterfaceinJava?

A.List

B.Set

C.Map

D.File

4.Whatisthepurposeofthe'synchronized'keywordinJava?

A.Tomakeamethodprivate

B.Tomakeamethodstatic

C.Toensurethreadsafety

D.Toallowmultiplethreadstoexecuteamethodsimultaneously

5.WhichofthefollowingisnotaJavaplatform?

A.JavaSE

B.JavaEE

C.JavaME

D.JavaPro

6.WhatisthecorrectwaytodeclareavariableforastringinJava?

A.intstr;

B.Stringstr;

C.strString;

D.Stringstr[];

7.Whatistheoutputofthefollowingcodesnippet:`System.out.println(1.0/0);`

A.Infinity

B.-Infinity

C.NaN

D.Anexceptionisthrown

8.WhichofthefollowingisnotavalidJavaoperator?

A.+=

B.||

C.::

D.&&

9.Whatistheresultofthefollowingexpression:`true&&false||true&&true;`

A.true

B.false

C.1

D.0

10.Whatisthepurposeofthe'try-with-resources'statementinJava?

A.Tocatchexceptions

B.Todeclareinstancevariables

C.Toautomaticallycloseresources

D.Tocreateanonymousclasses

答案

1.B

2.D

3.D

4.C

5.D

6.B

7.C

8.C

9.A

10.C

二、多項選擇題（每題2分，共10題）

1.WhichofthefollowingarevalidwaystocreateaStringobjectinJava?

A.Strings=newString("Hello");

B.Strings="Hello";

C.Strings='H'+"ello";

D.Strings=String.valueOf(123);

2.WhichofthefollowingaretrueaboutJava'sgarbagecollection?

A.Itautomaticallyfreesmemory

B.Itcanbeinvokedmanually

C.Itisnotguaranteedtorunatanyspecifictime

D.Itisacompile-timeprocess

3.WhichofthefollowingareconsideredbestpracticesinJavaprogramming?

A.Usingmeaningfulvariablenames

B.Commentingcodeextensively

C.Avoidingmagicnumbers

D.Usingexceptionsforcontrolflow

4.WhichofthefollowingarevalidwaystodefineamethodinJava?

A.publicvoidmyMethod(){}

B.privatestaticintmyMethod(){}

C.publicabstractvoidmyMethod();

D.publicfinalvoidmyMethod()throwsException{}

5.WhichofthefollowingaretrueaboutJava's'final'keyword?

A.Afinalclasscannotbesubclassed

B.Afinalmethodcannotbeoverridden

C.Afinalvariablecannotbechangedonceinitialized

D.Afinallocalvariablemustbeinitializedwhendeclared

6.WhichofthefollowingarevalidwaystohandleexceptionsinJava?

A.Usingatry-catchblock

B.Declaringtheexceptioninthemethodsignature

C.Ignoringtheexception

D.Usingafinallyblock

7.WhichofthefollowingaretrueaboutJava's'static'keyword?

A.Astaticmethodcanbecalledwithoutcreatinganinstanceoftheclass

B.Astaticvariableissharedamongallinstancesoftheclass

C.Astaticmethodcanaccessinstancevariablesdirectly

D.Astaticblockisexecutedwhentheclassisloaded

8.WhichofthefollowingaretrueaboutJava's'interface'?

A.Aninterfacecancontainmethoddeclarations

B.Aninterfacecancontainvariables

C.Aninterfacecanextendanotherinterface

D.Aninterfacecanhaveconstructors

9.WhichofthefollowingaretrueaboutJava's'enum'?

A.Anenumisaspecialdatatype

B.Anenumcanhavemethods

C.Anenumcanimplementinterfaces

D.Anenumcanhaveconstructors

10.WhichofthefollowingaretrueaboutJava's'switch'statement?

A.Theswitchexpressionmustbeofbyte,short,char,orinttype

B.Theswitchstatementcanhavemultiplecaselabelswiththesamevalue

C.Theswitchstatementcanhaveadefaultcase

D.Theswitchstatementcanhaveabreakstatement

答案

1.A,B,D

2.A,C

3.A,C

4.A,B,D

5.A,B,C,D

6.A,B,D

7.A,B,D

8.A,B,C

9.B,C,D

10.C,D

三、判斷題（每題2分，共10題）

1.Javaisastaticallytypedprogramminglanguage.(T/F)

2.Javasupportsoperatoroverloading.(T/F)

3.The'==’operatorinJavacanbeusedtocomparestringsforequality.(T/F)

4.Java's'break'statementcanbeusedtoexitalooporaswitchstatement.(T/F)

5.InJava,the'null'keywordisaliteralforthenullvalue.(T/F)

6.Javathreadsarelightweightandruninthesamememoryspaceasthemainprogram.(T/F)

7.Java's'assert'statementcanbeusedfordebuggingpurposes.(T/F)

8.Java's'transient'keywordcanbeusedtopreventavariablefrombeingserialized.(T/F)

9.Java's'volatile'keywordensuresthatavariableisonlyaccessedinathread-safemanner.(T/F)

10.Java's'instanceof'operatorcanbeusedtocheckifanobjectisaninstanceofaspecificclassorinterface.(T/F)

答案

1.T

2.F

3.F

4.T

5.T

6.T

7.T

8.T

9.F

10.T

四、簡答題（每題5分，共4題）

1.Whatisthedifferencebetween'==’and'equals()'inJava?

2.ExplaintheconceptofpolymorphisminJava.

3.WhatisthedifferencebetweenaconstructorandamethodinJava?

4.Whatisthepurposeofthe'@Override'annotationinJava?

答案

1.The'=='operatorisusedtocomparethereferencesoftwoobjectstocheckiftheypointtothesameobjectinmemory,whilethe'equals()'methodisusedtocomparethecontentoftwoobjectsforlogicalequality.

2.PolymorphisminJavareferstotheabilityofavariableoramethodtotakemorethanoneform.Itallowsasubclasstoprovideaspecificimplementationofamethodthatisalreadydefinedinitssuperclass.

3.Aconstructorisaspecialmethodthatiscalledwhenanobjectisinstantiated,anditisusedtoinitializetheobject'sfields.Amethodisablockofcodethatperformsaspecifictaskandcanbecalledonanobjecttoperformanaction.

4.The'@Override'annotationinJavaisusedtoindicatethatamethodinasubclassisintendedtooverrideamethodinthesuperclass.Ithelpsthecompilertocheckforerrorsrelatedtomethodoverriding.

五、討論題（每題5分，共4題）

1.DiscusstheimportanceofexceptionhandlinginJavaandprovideexamplesofcommonexceptions.

2.ExplaintheroleofinterfacesinJavaandhowtheycanbeusedtoachieveabstraction.

3.DiscussthebenefitsanddrawbacksofusingJava's'final'keyword.

4.WhataretheadvantagesofusingJava's'switch'statementover'if-else'statements?

答案

1.ExceptionhandlinginJavaiscrucialforcreatingrobustapplicationsthatcanhandleunexpectedsituationsgracefully.CommonexceptionsincludeNullPointerException,ArrayIndexOutOfBoundsException,andIOException.Properexceptionhandlingpreventstheapplicationfromcrashingandallowsforamoreuser-friendlyerrorrecoveryprocess.

2.InterfacesinJavaplayasignificantroleinachievingabstractionbydefiningacontractthatcanbeimplementedby