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J2ObjC: A Java to iOS Objective-C translator

google-opensource.blogspot.com

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Re: J2ObjC: A Java to iOS Objective-C translator

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what about library support? are libraries i use in java translated as well? performance?

It appears to work on Java code, not JVM bytecode (similar to GWT), so you'd have to decompile/disassemble the JVM bytecode first.

IT appears to follow GWT in other ways as well such as JSNI-ish interface (can even combine JSNI and native ObjC) and some optimized runtime classes for the ObjC environment.