How i get a JVM Heap information ?

[Martin]

Hi all,
is it possible to process data from jvm heap using software and print them on the screen?
I mean, information about how much memory takes each object, variable ...

Printout would look like for example this:
object name 1 - number indicative of count Bytes that object 1 takes in memory
object name 2 - number indicative of count Bytes that object 2 takes in memory
name of variable 1 - number indicative of count Bytes that variable 1 takes in memory
..
..

Im working in JBuilder under OS Windows.