Calling subclassed methods from constructors
From Object Initialization in Java Calling subclassed methods from constructors
The strict ordering of instance variable initialization enforced by
the Java compiler is, in part, an effort to ensure that during the initialization process,
instance variables are never used before they have been initialized to their proper initial values.
As illustrated earlier in this article, however, the rules of ordering are not bulletproof.
There are ways you can use an instance variable during initialization before it has been initialized to its proper value,
while it still has its default value. In the case of instance variable initializers, you can invoke a method
that uses a variable declared textually after the variable being initialized. Another way to use an instance variable before it has been properly initialized is to invoke a method from a superclass initializer or constructor that uses instance variables in a subclass.
I did a part of above text whit bold face.
I do not undrestand this part at all.
Please example for me.