How to return a value from try catch and finally

Question

So when I do a code of blocks inside a try    and I try to return a value  it tells me      no return values   import org w3c dom ranges RangeException    public class Pg257E5    public static void main String  args        try               System out println add args              catch RangeException e                e printStackTrace              finally               System out println  Thanks for using the program kiddo             public static double add String   values     shows a commpile error here that I don t have a return value       try               int length   values length          double arrayValues     new double length           double sum   0          for int i   0  i lt length  i                          arrayValues i    Double parseDouble values i                sum    arrayValues i                     return sum     I do have a return value here             Is it because if the an exception occurs the codes in try stops and doesn t get to the return value            catch NumberFormatException e                e printStackTrace              catch RangeException e                throw e            finally               System out println  Thank you for using the program               so would I need to put a return value of type double here               My question is  how do you return a value when you are using try and catch

User · Answer

It is because you are in a try statement  Since there could be an error  sum might not get initialized  so put your return statement in the finally block  that way it will for sure be returned   Make sure that you initialize sum outside the try catch finally so that it is in scope

User · Answer

To return a value when using try catch you can use a temporary variable  e g   public static double add String   values        double sum   0 0      try           int length   values length          double arrayValues     new double length           for int i   0  i  lt  length  i                  arrayValues i    Double parseDouble values i                sum    arrayValues i                   catch NumberFormatException e            e printStackTrace          catch RangeException e            throw e        finally           System out println  Thank you for using the program               return sum      Else you need to have a return in every execution path  try block or catch block  that has no throw

User · Answer

Here is another example that return s a boolean value using try catch   private boolean doSomeThing int index       try           if index 2  0               return true         catch  Exception e            System out println e getMessage           finally           System out println  Finally                     return false

User · Answer

The problem is what happens when you get NumberFormatexception thrown  You print it and return nothing   Note  You don t need to catch and throw an Exception back  Usually it is done to wrap it or print stack trace and ignore for example   catch RangeException e         throw e

[java] How to return a value from try, catch, and finally?

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