Java memory usage in inheritance

Question

What does the memory usage look like in Java when extending a base class.

Do the child class contain an instance of the base class (with it\'s own overhead and all)

Answer 1

There is only one class header per object, so it has only the latter.

By the way, you can easily check this using https://sourceforge.net/projects/sizeof/ or https://code.google.com/p/memory-measurer/