Needless to say, I can't tell you exactly what was on my exam, and besides it was probably a different bunch of questions from what you'll get.
But anyway, what was included in java.lang was exactly and only what's on the "objectives" page at Sun's certification site:
* java.lang.Math methods
* immutability of
String objects
* wrapper classes
[ Moderator: Can I say this? ] I didn't get anything about Comparator or Cloneable; you might.