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1、英文Java面试题Question:Whatistransientvariable?Answer:Transientvariablecan'tbeserialize.ForexampleifavariableisdeclaredastransientinaSerializableclassandtheclassiswrittentoanObjectStream,thevalueofthevariablecan'tbewrittentothestreaminsteadwhentheclassisretrievedfromtheObjectStr
2、eamthevalueofthevariablebecomesnull.Question:NamethecontainerswhichusesBorderLayoutastheirdefaultlayout?Answer:ContainerswhichusesBorderLayoutastheirdefaultare:window,FrameandDialogclasses.Question:WhatdoyouunderstandbySynchronization?Answer:Synchronizationisaprocessofcontr
3、ollingtheaccessofsharedresourcesbythemultiplethreadsinsuchamannerthatonlyonethreadcanaccessoneresourceatatime.Innonsynchronizedmultithreadedapplication,itispossibleforonethreadtomodifyasharedobjectwhileanotherthreadisintheprocessofusingorupdatingtheobject'svalue.Synchroniza
4、tionpreventssuchtypeofdatacorruption.E.g.Synchronizingafunction:publicsynchronizedvoidMethod1(){//Appropriatemethod-relatedcode.}E.g.Synchronizingablockofcodeinsideafunction:publicmyFunction(){synchronized(this){//Synchronizedcodehere.}}Question:WhatisCollectionAPI?Answer:T
5、heCollectionAPIisasetofclassesandinterfacesthatsupportoperationoncollectionsofobjects.Theseclassesandinterfacesaremoreflexible,morepowerful,andmoreregularthanthevectors,arrays,andhashtablesifeffectivelyreplaces.Exampleofclasses:HashSet,HashMap,ArrayList,LinkedList,TreeSetan
6、dTreeMap.Exampleofinterfaces:Collection,Set,ListandMap.Question:IsIteratoraClassorInterface?Whatisitsuse?Answer:IteratorisaninterfacewhichisusedtostepthroughtheelementsofaCollection.Question:Whatissimilarities/differencebetweenanAbstractclassandInterface?Answer:Differencesa
7、reasfollows:Interfacesprovideaformofmultipleinheritance.Aclasscanextendonlyoneotherclass.Interfacesarelimitedtopublicmethodsandconstantswithnoimplementation.Abstractclassescanhaveapartialimplementation,protectedparts,staticmethods,etc.AClassmayimplementseveralinterfaces.But
8、incaseofabstractclass,aclassmayextendonlyoneabstractclass.Interfacesareslowasitreq
