Closures for the Java Programming Language (aka BGGA)

• Current prototype: http://www.javac.info/closures.tar.gz (updated 2008-05-11) Please send bug reports to Neal Gafter
• Doug Lea's jsr166y fork-join framework: without function types and with function types. Get the code here.
• Current specification: Closures for the Java Programming Language (v0.5)
• Draft consensus JSR proposal
• A definition of closures
• 1-hour talk about the specification
• 2-hour talk with Q&A
• Open issue list: Closures: Open Issues (v0.5)

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)

Some explanations:

• 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").

Google's position regarding closures