Java optional parameters

Question

How do I use optional parameters in Java? What specification supports optional parameters?

Answer 1

You can use something like this:

public void addError(String path, String key, Object... params) { 
}

The params variable is optional. It is treated as a nullable array of Objects.

Strangely, I couldn't find anything about this in the documentation, but it works!

This is "new" in Java 1.5 and beyond (not supported in Java 1.4 or earlier).

I see user bhoot mentioned this too below.