Inner Class Problem

[garima jain]

Source: http://www.examlab.tk/ Practice Exam:3 Question# 69

 public class XOuter{
 
     static{
          st="Net";
     }
 
     static String st;
 
     class XInner{
 
          public final static int x=78;
          volatile String y;
 
          public XInner(int val){
               if (val>10)
                    return;
               y=st;
               System.out.println(y);
               throw new IllegalArgumentException();
          }
 
     }
 
     public static void main(String args[]){
          new XOuter().new XInner(5);
     }
 
}   

I thought the compilation of the above program would fail as inner classes can not have static declarations of any kind. but it compiles fine. Could someone please explain.

Answer is "Net" followed by an exception.

thanks.

[Brian Legg]

Yep, nothing wrong with the above code as far as I can see. Looks like they threw in the "volatile" keyword to throw you off maybe. An inner class can have static members including static inner classes of their own.

[garima jain]

if we remove the final keyword from declaration of x, program does not compile. It says "Inner classes can not have static declarations"

[Ankit Garg]

inner classes except static inner classes cannot have static variables. they can only have static constants...