torben@jit:~/Downloads/openjdk7-darwin-i386-20080820/bin/ >% ./java -version
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build 1.7.0-internal-landonf_2008_08_20_14_13-b00)
OpenJDK Server VM (build 14.0-b01, mixed mode)
torben@jit:~/Downloads/openjdk7-darwin-i386-20080820/bin/ >%

Download from here, extract and have fun

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