use a single empty iterator instead of multiple instances... it's all the same groove, my man...

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@477846 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/resources/Resources.java

@@ -45,23 +45,25 @@ public class Resources extends DataType implements ResourceCollection {
             return true;
         }
         public Iterator iterator() {
-            return new Iterator() {
-                public Object next() {
-                    throw new NoSuchElementException();
-                }
-                public boolean hasNext() {
-                    return false;
-                }
-                public void remove() {
-                    throw new UnsupportedOperationException();
-                }
-            };
+            return EMPTY_ITERATOR;
         }
         public int size() {
             return 0;
         }
     };
 
+    private static final Iterator EMPTY_ITERATOR = new Iterator() {
+        public Object next() {
+            throw new NoSuchElementException();
+        }
+        public boolean hasNext() {
+            return false;
+        }
+        public void remove() {
+            throw new UnsupportedOperationException();
+        }
+    };
+
     private class MyCollection extends AbstractCollection {
         private int size;