Groovy经典入门

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1、Submission631©ASERT2007GroovyTutorialDrPaulKingASERT,AustraliaAgile2007-1TopicsIntroduction•LanguageBasics•Closures•BuildersSubmission631©ASERT2007•DataAccess•OtherFeatures•TestingwithGroovy•FurtherIntegration•Grails•MoreInformationAgile2007-2Whatis

2、Groovy?•“GroovyislikeasuperversionofJava.ItcanleverageJava'senterprisecapabilitiesbutalsohascoolproductivityfeatureslikeclosures,Submission631©ASERT2007DSLsupport,buildersanddynamictyping.”Groovy=Java–boilerplatecode+optionaldynamictyping+closures+do

3、mainspecificlanguages+builders+metaprogrammingAgile2007-3GroovyGoodiesOverview•Fullyobjectoriented•Closures:reusableandassignablepiecesofcodeSubmission631©ASERT2007•Operatorscanbe•GPath:efficientoverloadedobjectnavigation•Multimethods•GroovyBeans•Lit

4、eraldeclarationfor•grepandswitchlists(arrays),maps,•Templates,builder,rangesandregularswing,Ant,markup,expressionsXML,SQL,XML-RPC,Scriptom,Grails,tests,MocksAgile2007-4GrowingAcceptance•Aslowandsteadystartbutnowgaininginmomentum;growinginmaturity&min

5、dshareSubmission631©ASERT2007GroovyRecipesPragmaticBookshelfAgile2007-5TheLandscapeofJVMLanguagesoptionalstatictypesSubmission631©ASERT2007DynamicfeaturescallfordynamictypesJavabytecodecallsforstatictypesTheterms“JavaVirtualMachine”and“JVM”meanaVirtu

6、alMachinefortheJava™platform.Agile2007-6GroovyStarterSystem.out.println("Hello,World!");//optionalsemicolon,println'Hello,World!'//System.out,brackets,//main()methoddefname='Guillaume'//dynamictypingprintln"$name,I'llgetthecar."//GStringSubmission631

7、©ASERT2007Stringlonger="""${name},thecarisinthenextrow."""//multi-linestring//withstatictypingassert0.5==1/2//BigDecimalequals()defprintSize(obj){//optionalducktypingprintobj?.size()//safedereferencing}defanimals=['ant','bee','cat']//nativelistsyntax

8、assertanimals.every{pet->//closuresupportpet<'dog'//overloading}Agile2007-7ABetterJava...importjava.util.List;importjava.util.ArrayList;classErase{privateListfilterLongerThan(Liststrings,intlength){ThiscodeListresult=newArrayList();isvalidfor(inti=0;