Re: forEach and Casting

Jason Cavett wrote:


I suggest you really make sure whether you can change it or not. If you
are using generics, casts often mean design issues.


You can quite easily make a "safe" casting iterator.

     /**
       * <strong>{see Iterator#next}
       * will throw ClassCastException...</strong>
       */
     public static <T> Iterable<T> castIterable(
         final Class<T> clazz, final Iterable<? super T> iterable
     ) {
         return new Iterable<T>() {
             public java.util.Iterator<T> iterator() {
                 return new java.util.Iterator<T>() {
                     private final java.util.Iterator<? super T> target =
                         iterable.iterator();
                     public boolean hasNext() {
                         return target.hasNext();
                     }
                     public T next() {
                         return clazz.cast(target.next());
                     }
                     public void remove() {
                         target.remove();
                     }
                 };
             }
         };
     }

....
         for (Specific thing : castIterable(Specific.class, generals)) {

(Disclaimer: Not tested.)

Tom Hawtin