JAVA外文翻译Word文档下载推荐.docx
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JAVA外文翻译Word文档下载推荐.docx
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ApplicationsofJava
JavausesmanyfamiliarprogrammingconceptsandconstructsandallowsportabilitybyprovidingacommoninterfacethroughanexternalJavaVirtualMachine(JVM).Avirtualmachineisaself-containedoperatingenvironment,createdbyasoftwarelayerthatbehavesasifitwereaseparatecomputer.Benefitsofcreatingvirtualmachinesincludebetterexploitationofpowerfulcomputingresourcesandisolationofapplicationstopreventcross-corruptionandimprovesecurity.
TheJVMallowscomputingdeviceswithlimitedprocessorsormemorytohandlemoreadvancedapplicationsbycallingupsoftwareinstructionsinsidetheJVMtoperformmostofthework.ThisalsoreducesthesizeandcomplexityofJavaapplicationsbecausemanyofthecorefunctionsandprocessinginstructionswerebuiltintotheJVM.Asaresult,softwaredevelopersnolongerneedtore-createthesameapplicationforeveryoperatingsystem.Javaalsoprovidessecuritybyinstructingtheapplicationtointeractwiththevirtualmachine,whichservedasabarrierbetweenapplicationsandthecoresystem,effectivelyprotectingsystemsfrommaliciouscode.
Amongotherthings,Javaistailor-madeforthegrowingInternetbecauseitmakesiteasytodevelopnew,dynamicapplicationsthatcouldmakethemostoftheInternet'
spowerandcapabilities.Javaisnowanopenstandard,meaningthatnosingleentitycontrolsitsdevelopmentandthetoolsforwritingprogramsinthelanguageareavailabletoeveryone.ThepowerofopenstandardslikeJavaistheabilitytobreakdownbarriersandspeedupprogress.
Today,youcanfindJavatechnologyinnetworksanddevicesthatrangefromtheInternetandscientificsupercomputerstolaptopsandcellphones,fromWallStreetmarketsimulatorstohomegameplayersandcreditcards.Thereareover3millionJavadevelopersandnowthereareseveralversionsofthecode.Mostlargecorporationshavein-houseJavadevelopers.Inaddition,themajorityofkeysoftwarevendorsuseJavaintheircommercialapplications(Lazaridis,2003).
Applications
JavaontheWorldWideWeb
JavahasfoundaplaceonsomeofthemostpopularwebsitesintheworldandtheusesofJavacontinuestogrow.Javaapplicationsnotonlyprovideuniqueuserinterfaces,theyalsohelptopowerthebackendofwebsites.EverybodyisprobablyfamiliarwitheBayandAmazonhavebeenJavapioneersontheWorldWideWeb.
eBay
Foundedin1995,eBayenablese-commerceonalocal,nationalandinternationalbasiswithanarrayofWebsites.YoucanfinditoneBay,evenifyoudidn'
tknowitexisted.Onatypicalday,morethan100millionitemsarelistedoneBayintensofthousandsofcategories.oneBay;
theworld'
slargestonlinemarketplace.
eBayusesJavaalmosteverywhere.Toaddresssomesecurityissues,eBaychoseSunMicrosystems'
JavaSystemIdentityManagerastheplatformforrevampingitsidentitymanagementsystem.Thetaskathandwastoprovideidentitymanagementformorethan12,000eBayemployeesandcontractors.
NowmorethanathousandeBaysoftwaredevelopersworkdailywithJavaapplications.Java'
sinherentportabilityallowseBaytomovetonewhardwaretotakeadvantageofnewtechnology,packaging,orpricing,withouthavingtorewriteJavacode.
Amazon
AhascreatedaWebServiceapplicationthatenablesuserstobrowsetheirproductcatalogandplaceorders.AusesaJavaapplicationthatsearchestheAmazoncatalogforbookswhosesubjectmatchesauser-selectedtopic.Theapplicationdisplaystenbooksthatmatchthechosentopic,andshowstheauthorname,booktitle,listprice,Amazondiscountprice,andthecovericon.Theusermayoptionallyviewonereviewperdisplayedtitleandmakeabuyingdecision.
JavainDataWarehousing&
Mining
Althoughmanycompaniescurrentlybenefitfromdatawarehousingtosupportcorporatedecisionmaking,newbusinessintelligenceapproachescontinuetoemergethatcanbepoweredbyJavatechnology.Applicationssuchasdatawarehousing,datamining,EnterpriseInformationPortalsandKnowledgeManagementSystemsareabletoprovideinsightintocustomerretention,purchasingpatterns,andevenfuturebuyingbehavior.
Theseapplicationscannotonlytellwhathashappenedbutwhyandwhatmayhappengivencertainbusinessconditions;
Asaresultofthisinformationgrowth,peopleatalllevelsinsidetheenterprise,aswellassuppliers,customers,andothersinthevaluechain,areclamoringforsubsetsofthevaststoresofinformationtohelpthemmakebusinessdecisions.Whilecollectingandstoringvastamountsofdataisonething,utilizinganddeployingthatdatathroughouttheorganizationisanother.
Thetechnicalchallengesinherentinintegratingdisparatedataformats,platforms,andapplicationsaresignificant.However,emergingstandardssuchastheApplicationProgrammingInterfacesthatcomprisetheJavaplatform,aswellasExtendableMarkupLanguagetechnologiescanfacilitatetheinterchangeofdataandthedevelopmentofnextgenerationdatawarehousingandbusinessintelligenceapplications.WhileJavatechnologyhasbeenusedextensivelyforclientsideaccessandtopresentationlayerchallenges,itisrapidlyemergingasasignificanttoolfordevelopingscaleableserversideprograms.TheJava2Platform,EnterpriseEdition(J2EE)providestheobject,transaction,andsecuritysupportforbuildingsuchsystems.
MetadataIssues
Oneofthekeyissuesthatbusinessintelligencedevelopersmustsolveisthatofincompatiblemetadataformats.Metadatacanbedefinedasinformationaboutdataorsimply"
dataaboutdata."
Inpractice,metadataiswhatmosttools,databases,applications,andotherinformationprocessesusetodefine,relate,andmanipulatedataobjectswithintheirownenvironments.Itdefinesthestructureandmeaningofdataobjectsmanagedbyanapplicationsothattheapplicationknowshowtoprocessrequestsorjobsinvolvingthosedataobjects.Developerscanusethisschematocreateviewsforusers.Also,userscanbrowsetheschematobetterunderstandthestructureandfunctionofthedatabasetablesbeforelaunchingaquery.
Toaddressthemetadataissue,agroupofcompanieshavejoinedtodeveloptheJavaMetadataInterface(JMI)API.TheJMIAPIpermitstheaccessandmanipulationofmetadatainJavawithstandardmetadataservices.JMIisbasedontheMetaObjectFacility(MOF)specificationfromtheObjectManagementGroup(OMG).TheMOFprovidesamodelandasetofinterfacesforthecreation,storage,access,MetamodelandmetadatainterchangeisdoneviaXMLandusestheXMLMetadataInterchange(XMI)specification,alsofromtheOMG.JMIleveragesJavatechnologytocreateanend-to-enddatawarehousingandbusinessintelligencesolutionsframework.
EnterpriseJavaBeans
AkeytoolprovidedbyJ2EEisEnterpriseJavaBeans(EJB),anarchitectureforthedevelopmentofcomponent-baseddistributedbusinessapplications.ApplicationswrittenusingtheEJBarchitecturearescalable,transactional,secure,andmulti-useraware.TheseapplicationsmaybewrittenonceandthendeployedonanyserverplatformthatsupportsJ2EE.TheEJBarchitecturemakesiteasyfordeveloperstowritecomponents,sincetheydonotneedtounderstandordealwithcomplex,system-leveldetailssuchasthreadmanagement,resourcepooling,andtransactionandsecuritymanagement.Thisallowsforrole-baseddevelopmentwherecomponentassemblers,platformprovidersandapplicationassemblerscanfocusontheirareaofresponsibilityfurthersimplifyingapplicationdevelopment.
DataStorage&
Access
Datastoredinexistingapplicationscanbeaccessedwithspecializedconnectors.Integrationandinteroperabilityofthesedatasourcesisfurtherenabledbythemetadatarepositorythatcontainsmetamodelsofthedatacontainedinthesources,whichthencanbeaccessedandinterchangeduniformlyviatheJMIAPI.Thesemetamodelscapturetheessentialstructureandsemanticsofbusinesscomponents,allowingthemtobeaccessedandqueriedviatheJMIAPIortobeinterchangedviaXML.Throughalloftheseprocesses,theJ2EEinfrastructureensuresthesecurityandintegrityofthedatathroughtransactionmanagementandpropagationandtheunderlyingsecurityarchitecture.
Toconsolidatehistoricalinformationforanalysisofsalesandmarketingtrends,adatawarehouseisoftenthebestsolution.Inthisexample,datacanbeextractedfromtheoperationalsystemswithavarietyofExtract,TransformandLoadtools(ETL).ThemetamodelsallowEJBsdesignedforfiltering,transformation,andconsolidationofdatatooperateuniformlyondatafromdiversedatasourcesasthebeanisabletoquerythemetamodeltoidentifyandextractthepertinentfields.Queriesandreportscanberunagainstthedatawarehousethatcontainsinformationfromnumeroussourcesinaconsistent,enterprise-widefashionthroughtheuseoftheJMIAPI.
JavainIndustrialSettings
ManypeopleknowJavaonlyasatoolontheWorldWideWebthatenablessitestoperformsomeoftheirfancierfunctionssuchasinteractivityandanimation.However,theactualusesforJavaaremuchmorewidespread.SinceJavaisanobject-orientedlanguage,thetimeneededforapplicationdevelopmentisminimal.
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