5 ways to use the static keyword in Java

Question

I just had an interview where one of the questions was something like "Describe 5 ways to use the static keyword in Java." I could only think of 2 on the spot, and afterwards I found 2 more. What is the 5th?

1. Declaring a field belonging to a class as opposed to an instance of the class.
2. Declaring a method that can be called on a class as opposed to an instance.
3. Declaring a nested class as static
4. Defining a static class initializer.
5. ???

Answer 1

Constants - static final (which is really the same as #1, but could be consider a separate usage)

Answer 2

static import (since java 1.5):

import static my.package.MyClass.*;

Answer 3

Would declaring a static interface be considered a class in this instance? If not then there's another use.

Answer 4

create a static block

static 
{

 // Do some static work 

}