What are the characteristics of the default constructor in Java?

There are several characteristics of the default constructor in Java:

1. The default constructor has no parameters and does not accept any arguments.
2. The default constructor has the same name as the class.
3. If a class does not explicitly define a constructor, Java will automatically generate a default constructor.
4. The default constructor has the same access modifier as the class.
5. The default constructor does not have a method body and is only used to initialize the default values of an object.
6. The default constructor will automatically call the default constructor in the parent class. If there is no default constructor in the parent class, or if it is not accessible, a compilation error will occur.
7. If a class explicitly defines any constructor, Java will not provide a default constructor.

It is important to note that when we explicitly define a constructor with parameters, the default constructor in Java is no longer provided. Therefore, if we need to use a parameter-less constructor, we need to explicitly define one.