Calling an overridable method from a constructor could result in failures or strange behaviors when instantiating a subclass which overrides the method.

For example:

• The subclass class constructor starts by contract by calling the parent class constructor.
• The parent class constructor calls the method, which has been overridden in the child class.
• If the behavior of the child class method depends on fields that are initialized in the child class constructor, unexpected behavior (like a NullPointerException) can result, because the fields aren't initialized yet.