8251989: Hex formatting and parsing utility

Reviewed-by: tvaleev, chegar, naoto, darcy

src/java.base/share/classes/java/lang/Integer.java

@@ -264,10 +264,18 @@ public final class Integer extends Number
      * <blockquote>
      *  {@code Integer.toHexString(n).toUpperCase()}
      * </blockquote>
+     * <p>
+     * @apiNote
+     * The {@link java.util.HexFormat} class provides formatting and parsing
+     * of byte arrays and primitives to return a string or adding to an {@link Appendable}.
+     * {@code HexFormat} formats and parses uppercase or lowercase hexadecimal characters,
+     * with leading zeros and for byte arrays includes for each byte
+     * a delimiter, prefix, and suffix.
      *
      * @param   i   an integer to be converted to a string.
      * @return  the string representation of the unsigned integer value
      *          represented by the argument in hexadecimal (base&nbsp;16).
+     * @see java.util.HexFormat
      * @see #parseUnsignedInt(String, int)
      * @see #toUnsignedString(int, int)
      * @since   1.0.2