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1、Javacollections·Acollectionallowsagroupofobjectstobetreatedasasingleunit.Arbitraryobjectscanbestored,retrievedandmanipulatedaselementsofthesecollections.·CollectionsFrameworkpresentsasetofstandardutilityclassestomanagesuchcollections.1.Itcontains‘coreinterfaces’whi
2、challowcollectionstobemanipulatedindependentoftheirimplementations.Theseinterfacesdefinethecommonfunctionalityexhibitedbycollectionsandfacilitatedataexchangebetweencollections.2.Asmallsetofimplementationsthatareconcreteimplementationsofthecoreinterfaces,providingda
3、tastructuresthataprogramcanuse.3.Anassortmentofalgorithmstoperformvariousoperationssuchas,sortingandsearching.·Collectionsframeworkisinterfacebased,collectionsareimplementedaccordingtotheirinterfacetype,ratherthanbyimplementationtypes.Byusingtheinterfaceswheneverco
4、llectionsofobjectsneedtobehandled,interoperabilityandinterchangeabilityareachieved.·ByconventioneachofthecollectionimplementationclassesprovideaconstructortocreateacollectionbasedontheelementsintheCollectionobjectpassedasargument.Bythesametoken,Mapimplementationspr
5、ovideaconstructorthatacceptsaMapargument.Thisallowstheimplementationofacollection(Collection/Map)tobechanged.ButCollectionsandMapsarenotinterchangeable.·InterfacesandtheirimplementationsinJava1.2Collection
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7、__Set(nodupes,nullallowedbasedonimplementation)àHashSet
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12、__SortedSet(OrderedSet)àTreeSet
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14、__List(orderedcollection,dupesOK)àVector,ArrayList,LinkedListMap(key-valuepairs,nullallowedbasedonimplementation)àHashTable,HashMap
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16、__SortedMap(OrderedMap)àTreeMapInterfaceDescriptionCollectionAbasicinterfacethatdefinestheoperatio
17、nsthatalltheclassesthatmaintaincollectionsofobjectstypicallyimplement.SetExtendsCollection,setsthatmaintainuniqueelements.SetinterfaceisdefinedintermsoftheequalsoperationSortedSetExtendsSet,maintaintheelementsinasortedorderListExtendsCollection,maintainelementsinas
18、equentialorder,duplicatesallowed.MapAbasicinterfacethatdefinesoperationsthatclassesthatrepresentmappingsofkeystovaluestypicallyimplementSortedMap
