Hi again!

I just can't find a solution for my current problem.
Is there any solution i can break a running method which is supposed to return an int[] or whatever but !without! any return value.
I thought that might work with some exception but i didn't find a propper way. To be more specific i want something which tries to find out if a certain field of an object was set and if yes return it and if no returns a message which tells me that the input wasn't made so far.
something like:

       public int[] returnArray(){
           if(array_was_set==true) return the array;
           else show message that it wasnt set and quit the method without any return value;
       }


thanks in advance!