A special version of code fragment profiling, 
that provides timing of each line of specific 
method(s).

Obviously, not all lines are good candidates, so 
limiting this to method calls and loops would 
allow to keep the interference of a reasonable 
level.

I've used this approach frequently when trying to 
determine why certain method is slow - simply put 
System.currentTimeMillis on several line within a 
method to determine, which is the offending line 
(usually which is the offending method call).