Method toChars

lib/java/lang/Character.java:2435–2462

Converts the specified Unicode code point into a UTF-16 encoded sequence and copies the value(s) into the char array dst, starting at index dstIndex. @param codePoint the Unicode code point to encode. @param dst the destination array to copy the encoded value i

(int codePoint, char[] dst, int dstIndex)

     * @since 1.5
     */
    public static int toChars(int codePoint, char[] dst, int dstIndex) {
        if (!isValidCodePoint(codePoint)) {
            throw new IllegalArgumentException();
        }
        if (dst == null) {
            throw new NullPointerException();
        }
        if (dstIndex < 0 || dstIndex >= dst.length) {
            throw new IndexOutOfBoundsException();
        }

        if (isSupplementaryCodePoint(codePoint)) {
            if (dstIndex == dst.length - 1) {
                throw new IndexOutOfBoundsException();
            }
            // See RFC 2781, Section 2.1
            // http://www.faqs.org/rfcs/rfc2781.html
            int cpPrime = codePoint - 0x10000;
            int high = 0xD800 | ((cpPrime >> 10) & 0x3FF);
            int low = 0xDC00 | (cpPrime & 0x3FF);
            dst[dstIndex] = (char) high;
            dst[dstIndex + 1] = (char) low;
            return 2;
        }

        dst[dstIndex] = (char) codePoint;
        return 1;
    }

    /**
     * Converts the specified Unicode code point into a UTF-16 encoded sequence