Method codePointCount

classpath/java/lang/Character.java:240–257

(CharSequence sequence, int start, int end)

  }

  public static int codePointCount(CharSequence sequence, int start, int end) {
    int length = sequence.length();
    if (start < 0 || start > end || end >= length) {
      throw new IndexOutOfBoundsException();
    }

    int count = 0;
    for (int i = start; i < end; ++i) {
      if (isHighSurrogate(sequence.charAt(i))
          && (i + 1) < end
          && isLowSurrogate(sequence.charAt(i + 1)))
      {
        ++ i;
      }
      ++ count;
    }
    return count;
  }
}