Method codePointAt

classpath/java/lang/Character.java:222–238

(CharSequence sequence, int offset)

  }

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

    char high = sequence.charAt(offset);
    if (! isHighSurrogate(high) || offset >= length) {
      return high;
    }
    char low = sequence.charAt(offset + 1);
    if (! isLowSurrogate(low)) {
      return high;
    }

    return toCodePoint(high, low);
  }

  public static int codePointCount(CharSequence sequence, int start, int end) {
    int length = sequence.length();