Default constructors and inheritance in Java

Question

I have a question about default constructors and inheritance in Java.

Generally, if you write a class and do not include any constructor, Java provides automatically for you a default constructor (one without parameters), which initializes all instance variables of the class (if there are any) with some default values (0, null, or false). If you write a constructor, however, with some parameters, and you don't write any default constructor, then Java does not provide a default constructor. My question is: what is the case with classes, which inherit from other classes - if I write a constructor with some parameters in them, but don't include a default constructor, do they inherit the default constructor of the super class?

Answer 1

1. If you do not make a constructor, the default empty constructor is automatically created.

2. If any constructor does not explicitly call a super or this constructor as its first statement, a call to super() is automatically added.

Always.