What is the memory consumption of an object in Java?

Question

Is the memory space consumed by one object with 100 attributes the same as that of 100 objects, with one attribute each?

How much memory is allocated for an object?<

Answer 1

The rules about how much memory is consumed depend on the JVM implementation and the CPU architecture (32 bit versus 64 bit for example).

For the detailed rules for the SUN JVM check my old blog

Regards, Markus