10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.util;
  27 
  28 import java.security.*;
  29 
  30 import jdk.internal.misc.JavaLangAccess;
  31 import jdk.internal.misc.SharedSecrets;
  32 
  33 /**
  34  * A class that represents an immutable universally unique identifier (UUID).
  35  * A UUID represents a 128-bit value.
  36  *
  37  * <p> There exist different variants of these global identifiers.  The methods
  38  * of this class are for manipulating the Leach-Salz variant, although the
  39  * constructors allow the creation of any variant of UUID (described below).
  40  *
  41  * <p> The layout of a variant 2 (Leach-Salz) UUID is as follows:
  42  *
  43  * The most significant long consists of the following unsigned fields:
  44  * <pre>
  45  * 0xFFFFFFFF00000000 time_low
  46  * 0x00000000FFFF0000 time_mid
  47  * 0x000000000000F000 version
  48  * 0x0000000000000FFF time_hi
  49  * </pre>
  50  * The least significant long consists of the following unsigned fields:
  51  * <pre>

  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.util;
  27 
  28 import java.security.*;
  29 
  30 import jdk.internal.access.JavaLangAccess;
  31 import jdk.internal.access.SharedSecrets;
  32 
  33 /**
  34  * A class that represents an immutable universally unique identifier (UUID).
  35  * A UUID represents a 128-bit value.
  36  *
  37  * <p> There exist different variants of these global identifiers.  The methods
  38  * of this class are for manipulating the Leach-Salz variant, although the
  39  * constructors allow the creation of any variant of UUID (described below).
  40  *
  41  * <p> The layout of a variant 2 (Leach-Salz) UUID is as follows:
  42  *
  43  * The most significant long consists of the following unsigned fields:
  44  * <pre>
  45  * 0xFFFFFFFF00000000 time_low
  46  * 0x00000000FFFF0000 time_mid
  47  * 0x000000000000F000 version
  48  * 0x0000000000000FFF time_hi
  49  * </pre>
  50  * The least significant long consists of the following unsigned fields:
  51  * <pre>