This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The "@1fee6fc" that you see when you call the toString() method of class Object is the hash code of the object in hexadecimal; it does not have anything to do with the size of the object in memory (or the address of the object, as some people think it is).
There is no easy way to find the size of a Java object in memory.