Accessing a key in a java map.

I have created a java.util.HashMap<String, TressSet<MyJavaObject>>  and have placed that into the $values map which I then pass into Velocity.  The name of a group of things mapped to a sorted set of those things.
I have no problem iterating through the map but I cannot seem to find a way to access the key (the String) of the map.entry and overlay that into my form. How is this done. I want to print out the name of the group and then the group. Common thing to do I would think..

#foreach($LabTestTypeEntrySet in $values.TestTypeGroupedBySpecimenName.keySet())
$LabTestTypeEntrySet.??? - what goes here ---??
#foreach($LabTestType in $values.TestTypeGroupedBySpecimenName.get($LabTestTypeEntrySet) )
$LabTestType.labTestTypeCode
#end
#end

I am kind of new to Velocity and have been hunting for the solution.. can someone help me out real quick.
Thanks guys..