Creating Object in a thread safety way

Question

Directly from this web site, I came across the following description about creating object thread safety.

Warning: When constructing an object that will b

Answer 1

You just have to make sure, that even, when one thread hasn't initialized the Object, no Thread will access it (and get a NullpointerException).

In this case, it would happen in the constructor (I suppose), but another thread could access that very object between its add to the list and the end of the constructor.