Method codePointAt

lib/java/lang/Character.java:2178–2196

Returns the code point at index in the specified sequence of character units. If the unit at index is a high-surrogate unit, index + 1 is less than the length of the sequence and the unit at index + 1 is a low-surrogate unit, then the supplementary code point represen

(CharSequence seq, int index)

     * @since 1.5
     */
    public static int codePointAt(CharSequence seq, int index) {
        if (seq == null) {
            throw new NullPointerException();
        }
        int len = seq.length();
        if (index < 0 || index >= len) {
            throw new StringIndexOutOfBoundsException(index);
        }

        char high = seq.charAt(index++);
        if (index >= len) {
            return high;
        }
        char low = seq.charAt(index);
        if (isSurrogatePair(high, low)) {
            return toCodePoint(high, low);
        }
        return high;
    }

    /**
     * Returns the code point at {@code index} in the specified array of