Java memory guideline

Question

Likely a dumb question but..

Are there any good guidelines for how much memory basic Java data structures will consume?

Ie: How much memory will be consumed by a simple POJO with an int member and a String member (say that holds a 10 char String)? How much memory would be consumed by a List of 10 of said objects?

etc

Answer 1

RAM Footprint
http://java.sun.com/docs/books/performance/1st_edition/html/JPRAMFootprint.fm.html

String/Object Memory Usage
http://www.javamex.com/tutorials/memory/string_memory_usage.shtml