How to put into treemap an obj that already has a tree map?

Question

i have A Course class that contains a treemap for student.
now i need another tree map to contain an array of Course.
Course has it own attributes...
I tried creating new instance of course
course= new Course(aRegistrationNo,Add,rmNo.);
CoursetreeMap.put(aRegistrationNo, Course);
but this dosent work. Everytime i enter a new Course record, the old student treemap will get deleted also.
How can i make it so that i can retrive the Course using aRegistrationNo key and the whole student record of the course as well?

Answer 1

ok..maybe i ask the question differently...
//initialization
SortedMap ConCollection = new TreeMap();
SortedMap MaidContracts = new TreeMap();
can i do this for the input?
public void AddAgency(String r){
reg=r;
ConCollection.put(reg, MaidContracts);
//reg is a user input String
//MaidContracts is another treemap containing a few values
============================================================
is this what i do to get the out put?
MaidContracts=(SortedMap)ConCollection.get(SelectReg);
for (Iterator e = MaidContracts.values().iterator(); e.hasNext(); ) {
cTemp = (Contract) e.next();
cTemp.getcId();