--- old/src/java.base/share/classes/java/security/Timestamp.java	2014-08-27 09:58:41.000000000 +0800
+++ new/src/java.base/share/classes/java/security/Timestamp.java	2014-08-27 09:58:40.000000000 +0800
@@ -143,10 +143,10 @@
     public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append("(");
-        sb.append("timestamp: " + timestamp);
+        sb.append("timestamp: ").append(timestamp);
         List<? extends Certificate> certs = signerCertPath.getCertificates();
         if (!certs.isEmpty()) {
-            sb.append("TSA: " + certs.get(0));
+            sb.append("TSA: ").append(certs.get(0));
         } else {
             sb.append("TSA: <empty>");
         }