Closures (Lambda Expressions) for the Java Programming Language

Closures for Java draft specification (by Neal Gafter and Peter von der Ahé)

• Closures for Java (in two parts) v0.6a v0.6b
• Open Issues v0.6a v0.6b
• Discussion Mailing List

Previous documents (by Gilad Bracha, Neal Gafter, James Gosling, and Peter von der Ahé)

• BGGA closures specification: Closures for the Java Programming Language (v0.5)
• Differences between the openjdk prototype and the spec (v0.5)
• Open issue list: Closures: Open Issues (v0.5)
• Homepage for the openjdk closures project
• Latest openjdk prototype: http://www.javac.info/closures.tar.gz (updated 2008-08-11)
• A library for functional programming.
• Doug Lea's jsr166y fork-join framework: without function types and with function types. Get the code here.
• 1-hour talk about the specification
• 2-hour talk with Q&A
• A definition of closures
• comment on extension methods

Java Closures Tutorial from Zdenĕk Troníček

• Introduction
• Closures
• Function Types
• Local Variables
• Covariant return and contravariant arguments
• Closure Conversion
• Exceptions
• Advanced Features
• Closures Sources
• Completion Transparency
• Usage
• Control Abstraction and Restricted
• Method references
• Method references (Implementation Issue)
• Nonlocal transfer
• Modifier 'for'

Some explanations (issues related to the BGGA specification):

• Why doesn't return yield a result from the innermost closure?
• Neal's comments on the ongoing debate.
• Creating user-defined loop abstractions.
• Concurrent loops.
• A brief discussion of "Unreachable" (now renamed to "Nothing").

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