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1、JavaTechnicalDescriptionJavaasaProgrammingPlatform.Javaiscertainlyagoodprogramminglanguage.Thereisnodoubtthatitisoneofthebetterlanguagesavailabletoseriousprogrammers.Wethinkitcouldpotentiallyhavebeenagreatprogramminglanguage,butitisprobablytoolateforthat.Oncealanguageisouti
2、nthefield,theuglyrealityofcompatibilitywithexistingcodesetsin."Javawasneverjustalanguage.Therearelotsofprogramminglanguagesoutthere,andfewofthemmakemuchofasplash.Javaisawholeplatform,withahugelibrary,containinglotsofreusablecode,andanexecutionenvironmentthatprovidesservices
3、suchassecurity,portabilityacrossoperatingsystems,andautomaticgarbagecollection.Asaprogrammer,youwillwantalanguagewithapleasantsyntaxandcomprehensiblesemantics(i.e.,notC++).Javafitsthebill,asdodozensofotherfinelanguages.Somelanguagesgiveyouportability,garbagecollection,andth
4、elike,buttheydon'thavemuchofalibrary,forcingyoutorollyourownifyouwantfancygraphicsornetworkingordatabaseaccess.Well,Javahaseverything—agoodlanguage,ahigh-qualityexecutionenvironment,andavastlibrary.ThatcombinationiswhatmakesJavaanirresistiblepropositiontosomanyprogrammers.F
5、eaturesofJava.1.SimpleWewantedtobuildasystemthatcouldbeprogrammedeasilywithoutalotofesoterictrainingandwhichleveragedtoday'sstandardpractice.SoeventhoughwefoundthatC++wasunsuitable,wedesignedJavaascloselytoC++aspossibleinordertomakethesystemmorecomprehensible.Javaomitsmanyr
6、arelyused,poorlyunderstood,confusingfeaturesofC++that,inourexperience,bringmoregriefthanbenefit.15ThesyntaxforJavais,indeed,acleaned-upversionofthesyntaxforC++.Thereisnoneedforheaderfiles,pointerarithmetic(orevenapointersyntax),structures,unions,operatoroverloading,virtualb
7、aseclasses,andsoon.(SeetheC++notesinterspersedthroughoutthetextformoreonthedifferencesbetweenJavaandC++.)Thedesignersdidnot,however,attempttofixalloftheclumsyfeaturesofC++.Forexample,thesyntaxoftheswitchstatementisunchangedinJava.IfyouknowC++,youwillfindthetransitiontotheJa
8、vasyntaxeasy.Ifyouareusedtoavisualprogrammingenvironment(suchasVisualBasic),youwil
