Joe Darcy posted Project Coin: Anatomy of adding strings in switch to javac:

Earlier this week, I happily pushed an implementation of Project Coin's strings in switch language feature into a repository being used for JDK 7 milestone 5. JDK 7 binaries with strings in switch will be available for downloading in due course. The javac compiler uses the standard compiler architecture of having successive phases and adding strings in switch required modifications to several links in the chain of phases...