code: public static String getIndexedParamName(String paramPrefix, int... indices)
    {
      StringBuilder sb = new StringBuilder(paramPrefix);
      for(int index : indices)
      {
        sb.append('_').append(index);
      }
  
      return sb.toString();
    }
docs: Returns the name of the param that represent an entry in an array. This is the method
  used by <code>addIndexed*</code> methods.
  
  @param paramPrefix the prefix for the param
  @param indices the indices in the array (multiple dimensions)
  @return the name of the param that represent an entry in an array