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UUID


java.util

Class UUID

  • All Implemented Interfaces:
    Serializable, Comparable<UUID>


    public final class UUID
    extends Object
    implements Serializable, Comparable<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.

    Since:
    1.5
    See Also:
    Serialized Form
    • Constructor Detail

      • UUID

        public UUID(long mostSigBits,
            long leastSigBits)

        Constructs an instance with the specified bits.

        Parameters:
        mostSigBits - The 64 most significant bits of the UUID.
        leastSigBits - The 64 least significant bits of the UUID.
    • Method Detail

      • randomUUID

        public static UUID randomUUID()

        Generates a variant 2, version 4 (randomly generated number) UUID as per RFC 4122.

        Returns:
        an UUID instance.
      • nameUUIDFromBytes

        public static UUID nameUUIDFromBytes(byte[] name)

        Generates a variant 2, version 3 (name-based, MD5-hashed) UUID as per RFC 4122.

        Parameters:
        name - the name used as byte array to create an UUID.
        Returns:
        an UUID instance.
      • getLeastSignificantBits

        public long getLeastSignificantBits()

        The 64 least significant bits of the UUID.

        Returns:
        the 64 least significant bits.
      • getMostSignificantBits

        public long getMostSignificantBits()

        The 64 most significant bits of the UUID.

        Returns:
        the 64 most significant bits.
      • version

        public int version()

        The version of the variant 2 UUID as per RFC 4122. If the variant is not 2, then the version will be 0.

        • 1 - Time-based UUID
        • 2 - DCE Security UUID
        • 3 - Name-based with MD5 hashing UUID (nameUUIDFromBytes(byte[]))
        • 4 - Randomly generated UUID (randomUUID())
        • 5 - Name-based with SHA-1 hashing UUID
        Returns:
        an int value.
      • variant

        public int variant()

        The variant of the UUID as per RFC 4122.

        • 0 - Reserved for NCS compatibility
        • 2 - RFC 4122/Leach-Salz
        • 6 - Reserved for Microsoft Corporation compatibility
        • 7 - Reserved for future use
        Returns:
        an int value.
      • compareTo

        public int compareTo(UUID uuid)

        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.

        Specified by:
        compareTo in interface Comparable<UUID>
        Parameters:
        uuid - the UUID to compare to.
        Returns:
        a value of -1, 0 or 1 if this UUID is less than, equal to or greater than uuid.
      • equals

        public boolean equals(Object object)

        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.

        Overrides:
        equals in class Object
        Parameters:
        object - the Object to compare to.
        Returns:
        true if this UUID is equal to object or false if not.
        See Also:
        Object.hashCode()
      • toString

        public String toString()

        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"
         
        Overrides:
        toString in class Object
        Returns:
        a String instance.


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