| java.lang.Object | |
| ↳ | java.util.UUID |
UUID is an immutable representation of a 128-bit universally unique identifier (UUID).
There are multiple, variant layouts of UUIDs, but this class is based upon variant 2 of RFC 4122, the Leach-Salz variant. This class can be used to model alternate variants, but most of the methods will be unsupported in those cases; see each method for details.
| Public Constructors | |||||||||||
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Constructs an instance with the specified bits. | |||||||||||
| Public Methods | |||||||||||
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The clock sequence value of the version 1, variant 2 UUID as per RFC 4122. | |||||||||||
Compares this UUID to the specified UUID. | |||||||||||
Compares this UUID to another object for equality. | |||||||||||
Parses a UUID string with the format defined by | |||||||||||
The 64 least significant bits of the UUID. | |||||||||||
The 64 most significant bits of the UUID. | |||||||||||
Returns a hash value for this UUID that is consistent with the
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Generates a variant 2, version 3 (name-based, MD5-hashed) UUID as per RFC 4122. | |||||||||||
The node value of the version 1, variant 2 UUID as per RFC 4122. | |||||||||||
Generates a variant 2, version 4 (randomly generated number) UUID as per RFC 4122. | |||||||||||
The timestamp value of the version 1, variant 2 UUID as per RFC 4122. | |||||||||||
Returns a string representation of this UUID in the following format, as per RFC 4122. | |||||||||||
The variant of the UUID as per RFC 4122. | |||||||||||
The version of the variant 2 UUID as per RFC 4122. | |||||||||||
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Inherited Methods | |||||||||||
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From class java.lang.Object
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From interface java.lang.Comparable
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Constructs an instance with the specified bits.
| mostSigBits | The 64 most significant bits of the UUID. |
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| leastSigBits | The 64 least significant bits of the UUID. |
The clock sequence value of the version 1, variant 2 UUID as per RFC 4122.
long value.| UnsupportedOperationException | if version() is not 1.
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Compares this UUID to the specified UUID. The natural ordering of UUIDs is based upon the value of the bits from most significant to least significant.
| uuid | the UUID to compare to. |
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uuid.
Compares this UUID to another object for equality. If object
is not null, is a UUID instance, and all bits are equal, then
true is returned.
| object | the Object to compare to. |
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true if this UUID is equal to object
or false if not.
Parses a UUID string with the format defined by toString().
| uuid | the UUID string to parse. |
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| NullPointerException | if uuid is null. |
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| IllegalArgumentException | if uuid is not formatted correctly.
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The 64 least significant bits of the UUID.
The 64 most significant bits of the UUID.
Returns a hash value for this UUID that is consistent with the
equals(Object) method.
int value.
Generates a variant 2, version 3 (name-based, MD5-hashed) UUID as per RFC 4122.
| name | the name used as byte array to create an UUID. |
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The node value of the version 1, variant 2 UUID as per RFC 4122.
long value.| UnsupportedOperationException | if version() is not 1.
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Generates a variant 2, version 4 (randomly generated number) UUID as per RFC 4122.
The timestamp value of the version 1, variant 2 UUID as per RFC 4122.
long value.| UnsupportedOperationException | if version() is not 1.
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Returns a string representation of this UUID in the following format, as per RFC 4122.
UUID = time-low "-" time-mid "-"
time-high-and-version "-"
clock-seq-and-reserved
clock-seq-low "-" node
time-low = 4hexOctet
time-mid = 2hexOctet
time-high-and-version = 2hexOctet
clock-seq-and-reserved = hexOctet
clock-seq-low = hexOctet
node = 6hexOctet
hexOctet = hexDigit hexDigit
hexDigit =
"0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9" /
"a" / "b" / "c" / "d" / "e" / "f" /
"A" / "B" / "C" / "D" / "E" / "F"
The variant of the UUID as per RFC 4122.
int value.
The version of the variant 2 UUID as per RFC 4122. If the variant is not 2, then the version will be 0.
nameUUIDFromBytes(byte[]))randomUUID())int value.