What do empty curly brackets/braces mean in Java?

Question

Here is the whole source code:

http://zerioh.tripod.com/ressources/sockets.html

Here is the code I want to highlight:

Provider(){}

What does this line means? Thanks.

Answer 1

It means that there's nothing to execute in this Constructor. Usually Java provides this by default so writing down Provider(){} is not necessary.

The main difference between this one and the one that is provided by the compiler by default is that the access is restricted since it's not public.

Answer 2

It is a constructor with default accessibility.