Re: throwing exceptions on instantiation

thufir wrote:
> The makeGuest is working fine, probably because the data is fine.  If
the 
> constructor of Guest throws a DataException, though, I wouldn't want 
> makeGuest to return a new Guest!  I'm not quite sure what it should do, 
> if not that, though...
> 
> Should I try makeGuest first?  Would it make sense to have a
tryMakeGuest
> () method?
> 
> 
> 
> thufir@[EMAIL PROTECTED]
 
> thufir@[EMAIL PROTECTED]
 
> thufir@[EMAIL PROTECTED]
 cat src/a00720398/util/
> FileUtil.java
> /**
>  * FileUtil.java
>  */
> 
> package a00720398.util;
> 
> im****t java.util.*;
> im****t java.io.*;
> im****t a00720398.data.*;
> 
> public abstract class FileUtil {
> 
>         public static Guest makeGuest(List<String> guestData)throws 
> DataException{
>                 try{
>                         String[] data = guestData.toArray(new String
> [guestData.size()]);
>                         Guest guest = new Guest(data);
>                         return guest;
>                 } catch (DataException e) {
>                         e.printStackTrace();
>                 }
>                 return new Guest();
>         }
> 
>         public static List<Guest> loadGuests(){
>                 List<Guest> guests = new ArrayList<Guest>();
> 
> 
>           File file = new File("Guests.txt");
> 
>                 try {
>                         Scanner scanner = new Scanner(file);
>                         while (scanner.hasNextLine()) {
>                                 List<String> guestData = new 
> ArrayList<String>();
>                                 String line = scanner.nextLine();
>                                 Scanner lineScanner = new Scanner(line);
>                                 lineScanner.useDelimiter("\t");
>                                 while (lineScanner.hasNext()) {
>                                         String part =
lineScanner.next();
>                                         guestData.add(part);
>                                         if (!lineScanner.hasNext()) {
>                                                 try{
>                                                         Guest guest = 
> makeGuest(guestData);
>                                                        
guests.add(guest);
>                                                 } catch (DataException
e){
>                                                        
e.printStackTrace
> ();
>                                                 }
>                                         }
>                                 }
>                         }
>                 }catch (FileNotFoundException e) {
>                         e.printStackTrace();
>                 }
>                 return guests;
>         }
> 
> 
> 
> }
> thufir@[EMAIL PROTECTED]
 
> 

Just re-throw the exception.

-- 

Knute Johnson
email s/nospam/linux/

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