code: @Deprecated
      public final void reset(char[] chars, int start, int count)
      {
          if (chars == null) {
              chars = emptyCharArray;
          }
          
          text = chars;
  
          reset(start, count);
      }
docs: Reset the iterator to iterate over <code>count</code> characters
  in <code>chars</code> starting at <code>start</code>. This allows
  clients to reuse an iterator.
  
  @param chars the new array of characters over which to iterate.
  @param start the index of the first character over which to iterate.
  @param count the number of characters over which to iterate.
  
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android