The following example added to javax.net.ssl.SSLParameters:

     * // MEETEI MAYEK LETTERS HUK UN I (Unicode 0xabcd->0xabcf): 2 bytes
     * byte[] bytes = "\u005cuabcd\u005cuabce\u005cuabcf"
     * .getBytes(StandardCharsets.UTF_8);
     * String HUK_UN_I = new String(bytes, StandardCharsets.ISO_8859_1);
     *
     * // 0x00-0xFF: 1 byte
     * String rfc7301Grease8A = "\u005cu008A\u005cu008A";

The intent was:

     . Each Unicode character (0xabcd->0xabcf) is represented in the string using 2 bytes.
    . This is converted using UTF_8 into a byte array, which takes 3 bytes for each character.
    . This 9 byte array is then output as ISO_8859_1 during the ALPN negotiation.

Tweak the example to better explain this.

Also, the wrong RFC number was used for the GREASE example. It should be RFC 8701.