--- jsr166/src/main/java/util/AbstractCollection.java	2010/09/05 21:32:18	1.15
+++ jsr166/src/main/java/util/AbstractCollection.java	2010/09/30 01:53:03	1.16
@@ -439,7 +439,7 @@ public abstract class AbstractCollection
             sb.append(e == this ? "(this Collection)" : e);
             if (! it.hasNext())
                 return sb.append(']').toString();
-            sb.append(", ");
+            sb.append(',').append(' ');
         }
     }