--- old/src/java.base/share/classes/sun/security/x509/X509CRLImpl.java	2014-08-27 10:00:08.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/x509/X509CRLImpl.java	2014-08-27 10:00:07.000000000 +0800
@@ -537,31 +537,32 @@
      */
     public String toString() {
         StringBuilder sb = new StringBuilder();
-        sb.append("X.509 CRL v" + (version+1) + "\n");
+        sb.append("X.509 CRL v").append(version + 1).append('\n');
         if (sigAlgId != null)
-            sb.append("Signature Algorithm: " + sigAlgId.toString() +
-                  ", OID=" + (sigAlgId.getOID()).toString() + "\n");
+            sb.append("Signature Algorithm: ").append(sigAlgId)
+                    .append(", OID=")
+                    .append((sigAlgId.getOID())).append('\n');
         if (issuer != null)
-            sb.append("Issuer: " + issuer.toString() + "\n");
+            sb.append("Issuer: ").append(issuer).append('\n');
         if (thisUpdate != null)
-            sb.append("\nThis Update: " + thisUpdate.toString() + "\n");
+            sb.append("\nThis Update: ").append(thisUpdate).append('\n');
         if (nextUpdate != null)
-            sb.append("Next Update: " + nextUpdate.toString() + "\n");
+            sb.append("Next Update: ").append(nextUpdate).append('\n');
         if (revokedList.isEmpty())
             sb.append("\nNO certificates have been revoked\n");
         else {
-            sb.append("\nRevoked Certificates: " + revokedList.size());
+            sb.append("\nRevoked Certificates: ").append(revokedList.size());
             int i = 1;
             for (X509CRLEntry entry: revokedList) {
-                sb.append("\n[" + i++ + "] " + entry.toString());
+                sb.append("\n[").append(i++).append("] ").append(entry);
             }
         }
         if (extensions != null) {
             Collection<Extension> allExts = extensions.getAllExtensions();
             Object[] objs = allExts.toArray();
-            sb.append("\nCRL Extensions: " + objs.length);
+            sb.append("\nCRL Extensions: ").append(objs.length);
             for (int i = 0; i < objs.length; i++) {
-                sb.append("\n[" + (i+1) + "]: ");
+                sb.append("\n[").append(i + 1).append("]: ");
                 Extension ext = (Extension)objs[i];
                 try {
                    if (OIDMap.getClass(ext.getExtensionId()) == null) {
@@ -572,9 +573,8 @@
                            out.putOctetString(extValue);
                            extValue = out.toByteArray();
                            HexDumpEncoder enc = new HexDumpEncoder();
-                           sb.append("Extension unknown: "
-                                     + "DER encoded OCTET string =\n"
-                                     + enc.encodeBuffer(extValue) + "\n");
+                           sb.append("Extension unknown: ").append("DER encoded OCTET string =\n")
+                                   .append(enc.encodeBuffer(extValue)).append('\n');
                       }
                    } else
                        sb.append(ext.toString()); // sub-class exists
@@ -585,8 +585,7 @@
         }
         if (signature != null) {
             HexDumpEncoder encoder = new HexDumpEncoder();
-            sb.append("\nSignature:\n" + encoder.encodeBuffer(signature)
-                      + "\n");
+            sb.append("\nSignature:\n").append(encoder.encodeBuffer(signature)).append('\n');
         } else
             sb.append("NOT signed yet\n");
         return sb.toString();