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1、Java(programminglanguage)FromWikipedia,thefreeencyclopediaJavaisaprogramminglanguageoriginallydevelopedbyJamesGoslingatSunMicrosystems(whichhassincemergedintoOracleCorporation)andreleasedin1995asacorecomponentofSunMicrosystems'Javaplatform.Thelanguagederivesmuchofitssynta
2、xfromCandC++buthasasimplerobjectmodelandfewerlow-levelfacilities.Javaapplicationsaretypicallycompiledtobytecode(classfile)thatcanrunonanyJavaVirtualMachine(JVM)regardlessofcomputerarchitecture.Javaisageneral-purpose,concurrent,class-based,object-orientedlanguagethatisspec
3、ificallydesignedtohaveasfewimplementationdependenciesaspossible.Itisintendedtoletapplicationdevelopers"writeonce,runanywhere,"meaningthatcodethatrunsononeplatformdoesnotneedtobeeditedtorunonanother.Javaiscurrentlyoneofthemostpopularprogramminglanguagesinuse,particularlyfo
4、rclient-serverwebapplications,withareported10millionusers.[10][11]TheoriginalandreferenceimplementationJavacompilers,virtualmachines,andclasslibrariesweredevelopedbySunfrom1995.AsofMay2007,incompliancewiththespecificationsoftheJavaCommunityProcess,SunrelicensedmostofitsJa
5、vatechnologiesundertheGNUGeneralPublicLicense.OthershavealsodevelopedalternativeimplementationsoftheseSuntechnologies,suchastheGNUCompilerforJavaandGNUClasspath.Contents1History1.1Principles1.2Versions2Practices2.1Javaplatform2.1.1Implementations2.1.2Performance2.2Automat
6、icmemorymanagementHistorySeealso:Java(softwareplatform)#HistoryJamesGosling,MikeSheridan,andPatrickNaughtoninitiatedtheJavalanguageprojectinJune1991.[12]Javawasoriginallydesignedforinteractivetelevision,butitwastooadvancedforthedigitalcabletelevisionindustryatthetime.[13]
7、ThelanguagewasinitiallycalledOakafteranoaktreethatstoodoutsideGosling'soffice;itwentbythenameGreenlater,andwaslaterrenamedJava,fromJavacoffee,saidtobeconsumedinlargequantitiesbythelanguage'screators.[14]GoslingaimedtoimplementavirtualmachineandalanguagethathadafamiliarC/C
8、++styleofnotation.[15]SunMicrosystemsreleasedthefirstpublicimplementationasJava1.0in1995.Itpromi
