java课件编程思想英文版机械工业2012

CourseCourseBruceEckelJava编程思想，英文版第4版，机械工业出版社，CaySHorstmanGaryCornellJava核心技术，英文版第9版，人理中心主编，Java语言程序设计，中国铁道出版社，2010.WhatWhatisthisclassAnintroductiontoJavahistory,abouttheJavatechnology,object-orientedprogrammingconceptsLearingtheJavaLanguagebasics,classesandobjects,annotations,interfaceandinheritance,numberandstrings,generics,packageEssentialJavaExceptions,BasicI/O,concurrency,regularExpressionCustomTheTheJavaTechnologyJavaAbouttheJavatechnologyWhatcanJavatechnologydo?HowwillJavatechnologychangemy4JavaJavaWascreatedin1991byJamesGosingRelasedbuySunin1995AboutAbouttheJavaTheJavaProgrammingObjectHigh6JavaJavaSoftwareDevelopmentRunningRunningJavaTheTheJavaTheJavaVirtualTheJavaApplicationProgrammingInterfaceWhatWhatCanJavaTechnologyJavaplatformgivesyouthefollowingDevelopmentTools:compiling,running,monitoring,debugging,anddocumentingyourapplications.ApplicationProgrammingInterface(API):Itoffersawidearrayofusefulclassesreadyforuseinyourownapplications.DeploymentTechnologies:TheJDKsoftwareprovidesstandardmechanismssuchastheJavaWebStartsoftwareandJavaPlug-Insoftwarefordeployingyourapplicationstoendusers.UserInterfaceToolkits:TheJavaFX,Swing,andJava2DIntegrationLibraries:enabledatabaseaccessandmanipulationofremoteobjects.HowHowWillJavaTechnologyChangeMyGetstartedquickly:it'seasytoWritelesscode:aprogramwrittenintheJavacanbefourtimessmallerthanthesameprogramwritteninC++.Writebetteritencouragesgoodcodingautomaticgarbagecollectionhelpsyouavoidmemoryobjectorientation,JavaBeans™componentarchitecture,andwide-ranging,easilyextendibleAPIletyoureuseexisting,testedcodeandintroducefewerbugs.DevelopprogramsmoreTheJavaprogramminglanguageissimplerthandevelopmenttimecouldbeuptotwiceasprogramswillalsorequirefewerlinesofHowHowWillJavaTechnologyChangeMyAvoidplatformdependencies:Youcankeepyourprogramportablebyavoidingtheuseoflibrarieswritteninotherlanguages.Writeonce,runanywhere:BecauseapplicationswrittenintheJavaarecompiledintomachine-independentbytecodes,theyrunconsistentlyonanyJavaplatform.DistributesoftwaremoreWithJavaWebStartsoftware,userswillbeabletolaunchyourapplicationswithasingleclickofthemouse.Anautomaticversioncheckatstartupensuresthatusersarealwaysuptodatewiththelatestversionofyoursoftware.Ifanupdateisavailable,theJavaWebStartsoftwarewillautomaticallyupdatetheirinstallation.Towriteyourfirstprogram,you'llTheJavaSEDevelopmentKitX(JDKAtextCreatingCreatingYourFirstTocreateYourfirstapplication,HelloWorldApp,youCreateasourceAsourcefilecontainscode,writtenYoucanuseanytexteditortocreateandeditsourceCompilethesourcefileintoa.classTheJavaprogramminglanguagecompiler(javac)takesyoursourcefileandtranslatesitstextintoinstructionsthattheJavavirtualmachinecanTheinstructionscontainedwithinthisfileareknownasRuntheTheJavaapplicationlaunchertool(java)usestheJavavirtualmachinetorunyourapplication.CreateCreateaSource*simplyprints"HelloWorld!"tostandardpublicstaticvoidmain(String[]{System.out.println("HelloWorld!");//Displaythe}}Note:Typeallcode,commands,andfilenamesexactlyasshown.Boththecompiler(javac)andlauncher(java)arecase-sensitive,soyoumustcapitalizeCompileCompiletheSourceFileintoa.classSavethecodewiththenameBringupashell,or"command,"window.Changeyourcurrentdirectorytothedirectorywhereyourfileislocated.CompileCompiletheSourceFileintoa.classAttheprompt,typethefollowingcommandandpressEnter.javacHelloWorldApp.javaThecompilerhasgeneratedabytecodefile,RunRuntheInthesamedirectory,enterthefollowingcommandattheprompt:javaHelloWorldAppThenextfigureshowswhatyoushouldnowAACloserLookatthe"HelloWorld!"simplyprints"HelloWorld!"tostandardpublicstaticvoidmain(String[]{System.out.println("HelloWorld!");//Displaythe}}TheapplicationconsistsofthreeprimarysourcecodethemainSourceSourceCodeCommentsareignoredbythecompilerbutareusefultootherTheJavaprogramminglanguagesupportsthreekindsof/*textThecompilerignoreseverythingfrom/*to/**documentationThisindicatesadocumentationcomment(doccomment,forshort).Thejavadoctoolusesdoccommentswhenpreparingautomaticallygenerateddocumentation.//Thecompilerignoreseverythingfrom//totheendoftheTheTheHelloWorldAppClassThemostbasicformofaclassdefinitionclassname..}TheThemainEveryapplicationmustcontainamainmethodwhosesignatureis:publicstaticvoidmain(String[]args)Themodifierspublicandstaticcanbewrittenineitherorder(publicstaticorstaticpublic),buttheconventionistousepublicstaticasshownabove.Youcannametheargumentanythingyouwant,butmostprogrammerschoose"args"or"argv".Themainmethodistheentrypointforyourapplicationandwillsubsequentlyinvokealltheothermethodsrequiredbyyourprogram.TheThemainThemainmethodacceptsasingleargument:anarrayofelementsoftypeString.publicstaticvoidmain(String[]args)Thisarrayisthemechanismthroughwhichtheruntimesystempassesinformationtoyourapplication.