356 * {@code
357 * UUID = <time_low> "-" <time_mid> "-"
358 * <time_high_and_version> "-"
359 * <variant_and_sequence> "-"
360 * <node>
361 * time_low = 4*<hexOctet>
362 * time_mid = 2*<hexOctet>
363 * time_high_and_version = 2*<hexOctet>
364 * variant_and_sequence = 2*<hexOctet>
365 * node = 6*<hexOctet>
366 * hexOctet = <hexDigit><hexDigit>
367 * hexDigit =
368 * "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
369 * | "a" | "b" | "c" | "d" | "e" | "f"
370 * | "A" | "B" | "C" | "D" | "E" | "F"
371 * }</pre></blockquote>
372 *
373 * @return A string representation of this {@code UUID}
374 */
375 public String toString() {
376 return (digits(mostSigBits >> 32, 8) + "-" +
377 digits(mostSigBits >> 16, 4) + "-" +
378 digits(mostSigBits, 4) + "-" +
379 digits(leastSigBits >> 48, 4) + "-" +
380 digits(leastSigBits, 12));
381 }
382
383 /** Returns val represented by the specified number of hex digits. */
384 private static String digits(long val, int digits) {
385 long hi = 1L << (digits * 4);
386 return Long.toHexString(hi | (val & (hi - 1))).substring(1);
387 }
388
389 /**
390 * Returns a hash code for this {@code UUID}.
391 *
392 * @return A hash code value for this {@code UUID}
393 */
394 public int hashCode() {
395 long hilo = mostSigBits ^ leastSigBits;
396 return ((int)(hilo >> 32)) ^ (int) hilo;
397 }
398
399 /**
400 * Compares this object to the specified object. The result is {@code
401 * true} if and only if the argument is not {@code null}, is a {@code UUID}
402 * object, has the same variant, and contains the same value, bit for bit,
403 * as this {@code UUID}.
404 *
405 * @param obj
406 * The object to be compared
|
356 * {@code
357 * UUID = <time_low> "-" <time_mid> "-"
358 * <time_high_and_version> "-"
359 * <variant_and_sequence> "-"
360 * <node>
361 * time_low = 4*<hexOctet>
362 * time_mid = 2*<hexOctet>
363 * time_high_and_version = 2*<hexOctet>
364 * variant_and_sequence = 2*<hexOctet>
365 * node = 6*<hexOctet>
366 * hexOctet = <hexDigit><hexDigit>
367 * hexDigit =
368 * "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
369 * | "a" | "b" | "c" | "d" | "e" | "f"
370 * | "A" | "B" | "C" | "D" | "E" | "F"
371 * }</pre></blockquote>
372 *
373 * @return A string representation of this {@code UUID}
374 */
375 public String toString() {
376 return Long.toHexString((mostSigBits >>> 32) & 0xFFFFFFFFL, 8) + '-'
377 + Long.toHexString((mostSigBits >>> 16) & 0xFFFFL, 4) + '-'
378 + Long.toHexString( mostSigBits & 0xFFFFL, 4) + '-'
379 + Long.toHexString((leastSigBits >>> 48) & 0xFFFFL, 4) + '-'
380 + Long.toHexString( leastSigBits & 0xFFFFFFFFFFFFL, 12);
381 }
382
383 /**
384 * Returns a hash code for this {@code UUID}.
385 *
386 * @return A hash code value for this {@code UUID}
387 */
388 public int hashCode() {
389 long hilo = mostSigBits ^ leastSigBits;
390 return ((int)(hilo >> 32)) ^ (int) hilo;
391 }
392
393 /**
394 * Compares this object to the specified object. The result is {@code
395 * true} if and only if the argument is not {@code null}, is a {@code UUID}
396 * object, has the same variant, and contains the same value, bit for bit,
397 * as this {@code UUID}.
398 *
399 * @param obj
400 * The object to be compared
|