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1、英文原文：Javaisasimple,object-oriented,distributed,interpreted,robustsecurity,structure-neutral,portable,highperformance,multithreadeddynamiclanguage.ThemainadvantageofJavalanguage,Javaapplicationsacrosshardwareplatformsandoperatingsystemsfortransplant-thisisbecausetheJVMisinstalledoneachplatformc
2、anunderstandthesamebytecode.Javalanguageandplatformscalabilityisverystrong.Atthelowend,Javalanguageisthefirstopenstandardstechnologysupportenterpriseone,supporttheuseofXMLandWebservicecannotstridebusinesslinestoshareinformationandapplicationsChengXu.TherearethreeversionsofJavaplatform,whichmak
3、essoftwaredevelopers,serviceprovidersandequipmentmanufacturerscantargetspecificmarketdevelopment:1.JavaSEform applications.JavaSEincludessupportforJavaWebservicesdevelopmentclasses,andfortheJavaPlatform,EnterpriseEdition(JavaEE)toprovideabasis.MostJavadevelopersuseJavaSE5,alsoknownasJava5.0or"
4、Tiger".2.JavaEEformerlyknownasJ2EE.EnterpriseEditiontohelpdevelopanddeployportable,robust,scalableandsecureserver-sideJavaapplications.JavaSEJavaEEisbuiltonthefoundation,whichprovidesWebservices,componentmodel,managementandcommunicationAPI,canbeusedtoachieveenterprise-classservice-orientedarch
5、itectureandWeb2.0applications.3.JavaMEformerlyknownasJ2ME.JavaMEdevicesinmobileandembeddedapplicationsrunningonarobustandflexibleenvironment.JavaMEincludesflexibleuserinterfaces,robustsecuritymodel,andmanybuilt-innetworkprotocolsandnetworkingthatcanbedynamicallydownloadedandextensivesupportfor
6、offlineapplications.JavaME-basedapplicationspecificationonlywriteonceandcanbeusedinmanydevicesandcanusethenativefeaturesofeachdevice.Javalanguageissimple.JavalanguagesyntaxandtheClanguageandC++languageisveryclose,JavadiscardedtheC++,rarelyused,hardtounderstandthecharacteristics,suchasoperatoro
7、verloading,multipleinheritance,themandatoryautomatictypeconversion.Javalanguagedoesnotusepointers,andprovidesautomatedwastecollection.Javaisanobject-orientedlanguage.Javalanguageprovidesclasses,interfacesandinheritanceoftheoriginallangu
