Question: Is there any way of getting the memory requirements of objects at run-time?

Answer: JDK 1.1 provides a -prof option which among other things prints the bytes per instance and total instances for every class loaded in the VM at termination.

Java 2 provides a heap profiler which gives a detailed map of heap usage at termination.
http://developer.java.sun.com/developer/onlineTraining/Programming/JDCBook/perf3.html

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