How can I implement the Iterable interface

Question

Given the following code  how can I iterate over an object of type ProfileCollection   public class ProfileCollection implements Iterable           private ArrayList lt Profile gt  m Profiles       public Iterator lt Profile gt  iterator                     Iterator lt Profile gt  iprof   m Profiles iterator            return iprof                       public Profile GetActiveProfile             return  Profile m Profiles get m ActiveProfile            public static void main String   args         m PC   new ProfileCollection  profiles xml             properly outputs a profile       System out println m PC GetActiveProfile               not actually outputting any profiles       for Iterator i   m PC iterator   i hasNext               System out println i next                     how I actually want this to work  but won t even compile       for Profile prof  m PC            System out println prof

User · Answer

First off   public class ProfileCollection implements Iterable lt Profile gt      Second    return m Profiles get m ActiveProfile

User · Answer

Iterable is a generic interface   A problem you might be having  you haven t actually said what problem you re having  if any  is that if you use a generic interface class without specifying the type argument s  you can erase the types of unrelated generic types within the class   An example of this is in Non-generic reference to generic class results in non-generic return types   So I would at least change it to   public class ProfileCollection implements Iterable lt Profile gt         private ArrayList lt Profile gt  m Profiles       public Iterator lt Profile gt  iterator                     Iterator lt Profile gt  iprof   m Profiles iterator            return iprof                       public Profile GetActiveProfile             return  Profile m Profiles get m ActiveProfile             and this should work   for  Profile profile   m PC           do stuff     Without the type argument on Iterable  the iterator may be reduced to being type Object so only this will work   for  Object profile   m PC           do stuff     This is a pretty obscure corner case of Java generics   If not  please provide some more info about what s going on

[java] How can I implement the Iterable interface?

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