code: public ReflectionToStringBuilder setExcludeFieldNames(final String... excludeFieldNamesParam) {
          if (excludeFieldNamesParam == null) {
              this.excludeFieldNames = null;
          } else {
              //clone and remove nulls
              this.excludeFieldNames = toNoNullStringArray(excludeFieldNamesParam);
              Arrays.sort(this.excludeFieldNames);
          }
          return this;
      }
docs: Sets the field names to exclude.
  
  @param excludeFieldNamesParam
  The excludeFieldNames to excluding from toString or <code>null</code>.
  @return <code>this</code>