--- old/src/java.base/share/classes/sun/security/x509/X509CRLEntryImpl.java	2014-08-21 20:46:21.000000000 +0800
+++ new/src/java.base/share/classes/sun/security/x509/X509CRLEntryImpl.java	2014-08-21 20:46:20.000000000 +0800
@@ -292,17 +292,17 @@
         StringBuilder sb = new StringBuilder();
 
         sb.append(serialNumber.toString());
-        sb.append("  On: " + revocationDate.toString());
+        sb.append("  On: ").append(revocationDate.toString());
         if (certIssuer != null) {
-            sb.append("\n    Certificate issuer: " + certIssuer);
+            sb.append("\n    Certificate issuer: ").append(certIssuer);
         }
         if (extensions != null) {
             Collection<Extension> allEntryExts = extensions.getAllExtensions();
             Extension[] exts = allEntryExts.toArray(new Extension[0]);
 
-            sb.append("\n    CRL Entry Extensions: " + exts.length);
+            sb.append("\n    CRL Entry Extensions: ").append(exts.length);
             for (int i = 0; i < exts.length; i++) {
-                sb.append("\n    [" + (i+1) + "]: ");
+                sb.append("\n    [").append(i + 1).append("]: ");
                 Extension ext = exts[i];
                 try {
                     if (OIDMap.getClass(ext.getExtensionId()) == null) {
@@ -313,9 +313,8 @@
                             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: " + "DER encoded OCTET string =\n")
+                                    .append(enc.encodeBuffer(extValue)).append('\n');
                         }
                     } else
                         sb.append(ext.toString()); //sub-class exists