If you really want to do something along these lines, you'll have to write the code to read (and perhaps write) the "properties" file yourself. This can be fairly simple, actually. And you'd need some sort of data structure which allows multiple values for a given key - Properties doesn't. You may want to look at
org.apache.commons.collections.MultiMap for example. Or use an array for the value, as ak suggests.
[ March 13, 2006: Message edited by: Jim Yingst ]