src/jdk.jdi/share/classes/com/sun/tools/example/debug/expr/TokenMgrError.java

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

@@ -105,11 +105,11 @@
           retval.append("\\\\");
           continue;
         default:
           if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
             String s = "0000" + Integer.toString(ch, 16);
-            retval.append("\\u" + s.substring(s.length() - 4, s.length()));
+            retval.append("\\u").append(s.substring(s.length() - 4, s.length()));
           } else {
             retval.append(ch);
           }
           continue;
       }