Returning two types

Question

given the fact that you can only return one type from each method, how is it possible to do this
     static double getValidRadius (String errorMessage)
          double radius, area;
          boolean radiusOk;
          String errorMessage;
          radius = getRadius();
          validateRadius (radiusOK);
          while radiusOk = false
               errorMessage = ("error!, the radius must be 5-50 inclusive");
               System.out.println (errorMessage);
               radius = getRadius();
               radiusOk = validateRadius(radius);
     }

Answer 1

i am confused...
What exactely do you want do to with your method?
you pass an String do your method, ok, but you never use it, you deklare the same variable inside the method, which is not possible (you have two variables with the same name?).
you dont return anything, but the methods name is getValidRadius with the return type double.
What do you want to do with the line validateRadius( radiusOK ); is this a function call?
At least it should stand while (radiusOK == false) { and not while radiusOK = false which looks a little bit like VBscribt or something like that. Did you programm in VB before Java?