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1、毕业设计说明书英文文献及中文翻译学号：学号：软件学院学生姓名：软件工程学院：专业：指导教师：2014年6月第7页共7页ThinkinginJavaAlthoughitisbasedonC++,Javaismoreofa“pure”object-orientedlanguage.BothC++andJavaarehybridlanguages,butinJavathedesignersfeltthatthehybridizationwasnotasimportantasitwasinC++.Ahyb
2、ridlanguageallowsmultipleprogrammingstyles;thereasonC++ishybridistosupportbackwardcompatibilitywiththeClanguage.BecauseC++isasupersetoftheClanguage,itincludesmanyofthatlanguage’sundesirablefeatures,whichcanmakesomeaspectsofC++overlycomplicated.TheJava
3、languageassumesthatyouwanttodoonlyobject-orientedprogramming.Thismeansthatbeforeyoucanbeginyoumustshiftyourmindsetintoanobject-orientedworld(unlessit’salreadythere).Thebenefitofthisinitialeffortistheabilitytoprograminalanguagethatissimplertolearnandto
4、usethanmanyotherOOPlanguages.Inthischapterwe’llseethebasiccomponentsofaJavaprogramandwe’lllearnthateverythinginJavaisanobject,evenaJavaprogram.Eachprogramminglanguagehasitsownmeansofmanipulatingdata.Sometimestheprogrammermustbeconstantlyawareofwhattyp
5、eofmanipulationisgoingon.Areyoumanipulatingtheobjectdirectly,orareyoudealingwithsomekindofindirectrepresentation(apointerinCorC++)thatmustbetreatedwithaspecialsyntax?AllthisissimplifiedinJava.Youtreateverythingasanobject,usingasingleconsistentsyntax.A
6、lthoughyoutreateverythingasanobject,theidentifieryoumanipulateisactuallya“reference”toanobject.Youmightimaginethissceneasatelevision(theobject)withyourremotecontrol(thereference).Aslongasyou’reholdingthisreference,youhaveaconnectiontothetelevision,but
7、whensomeonesays“changethechannel”or“lowerthevolume,”whatyou’remanipulatingisthereference,whichinturnmodifiestheobject.Ifyouwanttomovearoundtheroomandstillcontrolthetelevision,youtaketheremote/referencewithyou,notthetelevision.Also,theremotecontrolcans
8、tandonitsown,withnotelevision.Thatis,justbecauseyouhaveareferencedoesn’tmeanthere’snecessarilyanobjectconnectedtoit.Soifyouwanttoholdawordorsentence,youcreateaStringreference:Buthereyou’vecreatedonlythereference,notanobject.Ifyoudecidedtosenda
