How to deal with creating a numbering/sorting scheme such as 1.1.2, etc...?

Hi all. I'm not quite sure how to ask this, but I need a push in the right direction. I am working on a program which connects to sql server through jdbc. I have a master record which then allows for the addition of multiple sub-records. The sub records need to be sortable by their designated 'order' The scheme that the user wants is 1.0, 1.1, 2.0, 2.1.3, etc... so they can put the items in a similar order as if it were chapters and sub chapters to a book. I can have the system generate a new number automatically, but I want the user to be able to adjust the order of the items listed. I am assuming that to use the . in the fields, I need to set the field to a char. Any thoughts are appreciated.
eko

Assuming you have a SubRecord class that models the subrecords, you can have that class implement Comparable interface. That interface requires that you implement one method: compareTo(Object). Your implementation of the compareTo() method will contain the logic that parses you string into tokens (the int values which are separated by '.') and does the comparison of two order strings. See the javadocs for Comparable to see the rules for how to implement that method.
Your MasterRocord should collect the subrecords in a List (ArrayList is fine). You can then use Collections.sort(List) to sort your subrecords.

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