239      * are zero, in which case a single zero is used. Next, the
 240      * exponent is represented by {@code "p"} followed
 241      * by a decimal string of the unbiased exponent as if produced by
 242      * a call to {@link Integer#toString(int) Integer.toString} on the
 243      * exponent value.
 244      *
 245      * <li>If <i>m</i> is a {@code double} value with a subnormal
 246      * representation, the significand is represented by the
 247      * characters {@code "0x0."} followed by a
 248      * hexadecimal representation of the rest of the significand as a
 249      * fraction.  Trailing zeros in the hexadecimal representation are
 250      * removed. Next, the exponent is represented by
 251      * {@code "p-1022"}.  Note that there must be at
 252      * least one nonzero digit in a subnormal significand.
 253      *
 254      * </ul>
 255      *
 256      * </ul>
 257      *
 258      * <table border>
 259      * <caption><h3>Examples</h3></caption>
 260      * <tr><th>Floating-point Value</th><th>Hexadecimal String</th>
 261      * <tr><td>{@code 1.0}</td> <td>{@code 0x1.0p0}</td>
 262      * <tr><td>{@code -1.0}</td>        <td>{@code -0x1.0p0}</td>
 263      * <tr><td>{@code 2.0}</td> <td>{@code 0x1.0p1}</td>
 264      * <tr><td>{@code 3.0}</td> <td>{@code 0x1.8p1}</td>
 265      * <tr><td>{@code 0.5}</td> <td>{@code 0x1.0p-1}</td>
 266      * <tr><td>{@code 0.25}</td>        <td>{@code 0x1.0p-2}</td>
 267      * <tr><td>{@code Double.MAX_VALUE}</td>
 268      *     <td>{@code 0x1.fffffffffffffp1023}</td>
 269      * <tr><td>{@code Minimum Normal Value}</td>
 270      *     <td>{@code 0x1.0p-1022}</td>
 271      * <tr><td>{@code Maximum Subnormal Value}</td>
 272      *     <td>{@code 0x0.fffffffffffffp-1022}</td>
 273      * <tr><td>{@code Double.MIN_VALUE}</td>
 274      *     <td>{@code 0x0.0000000000001p-1022}</td>
 275      * </table>
 276      * @param   d   the {@code double} to be converted.
 277      * @return a hex string representation of the argument.
 278      * @since 1.5
 279      * @author Joseph D. Darcy

 239      * are zero, in which case a single zero is used. Next, the
 240      * exponent is represented by {@code "p"} followed
 241      * by a decimal string of the unbiased exponent as if produced by
 242      * a call to {@link Integer#toString(int) Integer.toString} on the
 243      * exponent value.
 244      *
 245      * <li>If <i>m</i> is a {@code double} value with a subnormal
 246      * representation, the significand is represented by the
 247      * characters {@code "0x0."} followed by a
 248      * hexadecimal representation of the rest of the significand as a
 249      * fraction.  Trailing zeros in the hexadecimal representation are
 250      * removed. Next, the exponent is represented by
 251      * {@code "p-1022"}.  Note that there must be at
 252      * least one nonzero digit in a subnormal significand.
 253      *
 254      * </ul>
 255      *
 256      * </ul>
 257      *
 258      * <table border>
 259      * <caption>Examples</caption>
 260      * <tr><th>Floating-point Value</th><th>Hexadecimal String</th>
 261      * <tr><td>{@code 1.0}</td> <td>{@code 0x1.0p0}</td>
 262      * <tr><td>{@code -1.0}</td>        <td>{@code -0x1.0p0}</td>
 263      * <tr><td>{@code 2.0}</td> <td>{@code 0x1.0p1}</td>
 264      * <tr><td>{@code 3.0}</td> <td>{@code 0x1.8p1}</td>
 265      * <tr><td>{@code 0.5}</td> <td>{@code 0x1.0p-1}</td>
 266      * <tr><td>{@code 0.25}</td>        <td>{@code 0x1.0p-2}</td>
 267      * <tr><td>{@code Double.MAX_VALUE}</td>
 268      *     <td>{@code 0x1.fffffffffffffp1023}</td>
 269      * <tr><td>{@code Minimum Normal Value}</td>
 270      *     <td>{@code 0x1.0p-1022}</td>
 271      * <tr><td>{@code Maximum Subnormal Value}</td>
 272      *     <td>{@code 0x0.fffffffffffffp-1022}</td>
 273      * <tr><td>{@code Double.MIN_VALUE}</td>
 274      *     <td>{@code 0x0.0000000000001p-1022}</td>
 275      * </table>
 276      * @param   d   the {@code double} to be converted.
 277      * @return a hex string representation of the argument.
 278      * @since 1.5
 279      * @author Joseph D. Darcy