Editing JavaNestedClasses (section)

===Static inner classes===
Static inner classes or nested top level classes are declared and used like this:

 public class Lamp
 { 
   static String s = "hi"; 
   int i = 1; 
 
   static class Bulp
   { 
     void printHi() 
     { 
       System.out.println( s ); 
       // System.out.println( i );          // error, because i is not static 
     } 
   } 
 
   public static void main(String[] args) 
   { 
     Bulp bulp = new Lamp.Bulp();  
     bulp.printHi(); 
   } 
 }
There is no difference between a top level class and a nested top level class. You don't need an object of the outer class to use it.