What’s a default constructor in Java?

In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class . The default constructor implicitly calls the superclass’s nullary constructor, then executes an empty body.

Like C++, Java automatically creates default constructor if there is no default or parameterized constructor written by user , and (like C++) the default constructor automatically calls parent default constructor.10 Tem 2018

A default constructor is a constructor that either has no parameters, or if it has parameters, all the parameters have default values. If no user-defined constructor exists for a class A and one is needed, the compiler implicitly declares a default parameterless constructor A::A() .

Example of default constructor