src/jdk.jcmd/share/classes/sun/tools/jstat/RawOutputFormatter.java

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rev 10521 : 8055723[core]: Replace concat String to append in StringBuilder parameters
Contributed-by: Otavio Santana <otaviojava@java.net>

@@ -48,11 +48,11 @@
         if (header == null) {
             // build the header string and prune out any unwanted monitors
             StringBuilder headerBuilder = new StringBuilder();
             for (Iterator<Monitor> i = logged.iterator(); i.hasNext(); /* empty */ ) {
                 Monitor m = i.next();
-                headerBuilder.append(m.getName() + " ");
+                headerBuilder.append(m.getName()).append(' ');
             }
             header = headerBuilder.toString();
         }
         return header;
     }