--- old/src/java.base/share/classes/sun/reflect/generics/reflectiveObjects/WildcardTypeImpl.java	2016-07-15 16:35:53.475377010 -0700
+++ new/src/java.base/share/classes/sun/reflect/generics/reflectiveObjects/WildcardTypeImpl.java	2016-07-15 16:35:53.347377005 -0700
@@ -32,6 +32,7 @@
 import sun.reflect.generics.tree.FieldTypeSignature;
 import sun.reflect.generics.visitor.Reifier;
 import java.util.Arrays;
+import java.util.StringJoiner;
 
 
 /**
@@ -156,14 +157,12 @@
 
         assert bounds.length > 0;
 
-        boolean first = true;
+        StringJoiner sj = new StringJoiner(" & ");
         for(Type bound: bounds) {
-            if (!first)
-                sb.append(" & ");
-
-            first = false;
-            sb.append(bound.getTypeName());
+            sj.add(bound.getTypeName());
         }
+        sb.append(sj.toString());
+
         return sb.toString();
     }