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Mac : check java version

$ javac -version
javac 1.6.0_15
$ which javac
/usr/bin/javac

$ ls -la /System/Library/Frameworks/JavaVM.framework/Versions/
lrwxr-xr-x 1 root wheel 5 Sep 24 20:12 1.3 -> 1.3.1
drwxr-xr-x 3 root wheel 102 Jul 21 07:35 1.3.1
lrwxr-xr-x 1 root wheel 10 Sep 24 20:12 1.5 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 Sep 24 20:12 1.5.0 -> CurrentJDK
lrwxr-xr-x 1 root wheel 5 Sep 24 20:12 1.6 -> 1.6.0
drwxr-xr-x 7 root wheel 238 Sep 24 20:12 1.6.0
drwxr-xr-x 8 root wheel 272 Sep 24 20:12 A
lrwxr-xr-x 1 root wheel 1 Sep 24 20:12 Current -> A
lrwxr-xr-x 1 root wheel 3 Sep 24 20:12 CurrentJDK -> 1.6