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Closures for the Java Programming Language TS2294 JavaOne 2007

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2007 JavaOne. SM. Conference | Session TS2294 |. Session TS2294. Closures for the Java. Programming Language. Neal Gafter. Google. YOUR LOGO ...

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Closures for the Java Programming Language TS2294 JavaOne 2007Page 12007 JavaOneSMConference | Session TS2294 |Session TS2294Closures for the JavaProgramming LanguageNeal GafterGoogleYOUR LOGOHEREPage 22007 JavaOneSMConference | TS2294 |2Why Add Closures? In another thirty years people will laugh at anyonewho tries to invent a language without closuresjust as they'll laugh now at anyone who tries to inventa language without recursion.Mark Jason DominusPage 32007 JavaOneSMConference | TS2294 |3OutlineGoals DefinitionsExisting SolutionsRequirementsSpecificationExamples New APIsPage 42007 JavaOneSMConference | TS2294 |4OutlineGoals DefinitionsExisting SolutionsRequirementsSpecificationExamples New APIsPage 52007 JavaOneSMConference | TS2294 |5GoalsConcise function literalsWithout the pain of anonymous instancesInteroperate with existing APIsEnable control APIsFunctional and aggregate operationsSimple but powerfulPage 62007 JavaOneSMConference | TS2294 |6Definition: ClosureA closure is a function that refers to free variablesin its lexical context.A function is a block of code with parameters.It may produce a result value.A free variable is an identifier used but not definedby the closure.Page 72007 JavaOneSMConference | TS2294 |7Definition: Control APIAPIspecific statement formsSpecial methods invocationsOn par with builtin statementsPage 82007 JavaOneSMConference | TS2294 |8OutlineGoals DefinitionsExisting SolutionsRequirementsSpecificationExamples New APIsPage 92007 JavaOneSMConference | TS2294 |9Example: ForEachinterface OneArg<A> {void invoke(A arg);}<T> void forEach(Collection<T> c OneArg<T> block) {for (Iterator<T> it = c.iterator();c.hasNext();) {block.invoke(it.next());}}Using anonymous instancesPage 102007 JavaOneSMConference | TS2294 |10Example: ForEachfor (String s : strings) doThing(s);forEach(strings new OneArg<String>() {public void invoke(String s) {doThing(s);}});DesiredActualPage 112007 JavaOneSMConference | TS2294 |11E ...

Source: developers.sun.com

 

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