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How to use a nested TreeMap

Posted on 2003-11-25
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Last Modified: 2006-11-17
Hi,

I have data in the following form: Library Case Study example

String borrower, Object loanstate, Object loanitem.

I have many borrowers, loanstate is either borrowed or returned and the loanitem
would be say a bookitem.

What I would like to do is output in the form:

Borrower:      Borrowed       Book1
                              Book2
                              Book3
                              ..etc
               Returned       Book1
                              Book3

I thought maybe a nested TreeMap would allow me to do this i.e.

Key, (key, value)

borrower (loanstate, loanitem) would allow me to do this.

Any suggestions on how to code this up ?

Thanks

Drew
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Question by:DrewAllan
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6 Comments
 
LVL 86

Accepted Solution

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CEHJ earned 2000 total points
ID: 9817812
Your Borrower should be one entity. It should have a list of Books. One of the fields of Book should be loan state. The way you organise the collection of books is up to you. It could be a TreeMap keyed on the book's UID (ISBN)
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Author Comment

by:DrewAllan
ID: 9817868
Can you give me an example of how to code it ?

Thanks
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LVL 86

Expert Comment

by:CEHJ
ID: 9817886
Sorry - no. This is clearly class work and as such, it's against the Member Agreement to do this. We can certainly help with code you have already produced.
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Author Comment

by:DrewAllan
ID: 9830355
Ok I can appreciate that but it was more an example of how to constuct it I was after.

How me suggesting an example of how to construct the Nested TreeMap

would it be

Map(index,[indexOuter,[[indexInner1, [value1, value2,... ],[indexInner22, [value22, value23,... ], [indexInner3, [value31, value32,... ],[indexInner4, [value42, value43,... ]..etc])

where index would be string object called Borrower and the outer nest value [index,[values]] would be say an ArrayList and then the inner nest values would be another ArrayList.

Do you think this would work or would there be a better way of doing it?
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