--- old/src/java.base/share/classes/sun/security/provider/certpath/CertId.java	2014-08-27 09:59:37.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/provider/certpath/CertId.java	2014-08-27 09:59:37.000000000 +0800
@@ -223,13 +223,13 @@
     @Override public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append("CertId \n");
-        sb.append("Algorithm: " + hashAlgId.toString() +"\n");
+        sb.append("Algorithm: ").append(hashAlgId).append('\n');
         sb.append("issuerNameHash \n");
         HexDumpEncoder encoder = new HexDumpEncoder();
         sb.append(encoder.encode(issuerNameHash));
         sb.append("\nissuerKeyHash: \n");
         sb.append(encoder.encode(issuerKeyHash));
-        sb.append("\n" +  certSerialNumber.toString());
+        sb.append('\n').append(certSerialNumber);
         return sb.toString();
     }
 }