Are fields initialized before constructor code is run in Java?

Question

Can anyone explain the output of following program? I thought constructors are initialized before instance variables. So I was expecting the output to be \"XZYY\".

Answer 1

The initialization sequence is specified in JLS 12.5:

1.First, memory is allocated for the new object

2.Then all instance variables in the object (including the ones defined in this class and all of its superclasses) are initialized to their default values

3.Finally, the constructor is called.

https://stackoverflow.com/questions/26552799/which-run-first-default-values-for-instance-variables-or-super-constructors