--- old/src/java.desktop/share/classes/sun/font/AttributeValues.java	2014-08-25 09:59:19.000000000 +0800
+++ new/src/java.desktop/share/classes/sun/font/AttributeValues.java	2014-08-25 09:59:18.000000000 +0800
@@ -542,7 +542,7 @@
                 }
             }
         }
-        b.append("[btx=" + baselineTransform + ", ctx=" + charTransform + "]");
+        b.append("[btx=").append(baselineTransform).append(", ctx=").append(charTransform).append(']');
         b.append('}');
         return b.toString();
     }