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To build: This examples uses the SizeOf library from SourceForge: http://sizeof.sourceforge.net/ Download the library from that site and set SIZEOF=/path_to/SizeOf.jar To run: java -javaagent:$SIZEOF -jar jars/size.jar This produces output for various sized objects referenced in the text (which can vary depending on the 32-/64-bit setting of the JVM and whether or not CompressedOops are in use). Example 7-2: Size of a, b and c classes