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📜  Java.util.UUID类

📅  最后修改于: 2020-11-14 06:38:45             🧑  作者: Mango

介绍

java.util.UUID类表示一个不可变的通用唯一标识符(UUID)。以下是有关UUID的要点-

  • UUID表示一个128位的值。

  • 它用于创建随机文件名，Web应用程序中的会话ID，事务ID等。

  • UUID有四种不同的基本类型：基于时间的，DCE安全性，基于名称的和随机生成的UUID。

类声明

以下是java.util.UUID类的声明-

public final class UUID
   extends Object
   implements Serializable, Comparable

类的构造函数

Sr.No. Constructor & Description
1

UUID(long mostSigBits, long leastSigBits)

This constructor constructs a new UUID using the specified data.

类方法

Sr.No. Method & Description
1 int clockSequence()

This method shows the clock sequence value associated with this UUID.
2 int compareTo(UUID val)

This method compares this UUID with the specified UUID.
3 boolean equals(Object obj)

This method compares this object to the specified object.
4 static UUID fromString(String name)

This method creates a UUID from the string standard representation.
5 long getLeastSignificantBits()

This method returns the least significant 64 bits of this UUID’s 128 bit value.
6 long getMostSignificantBits()

This method returns the most significant 64 bits of this UUID’s 128 bit value.
7 int hashCode()

This method returns a hash code for this UUID.
8 static UUID nameUUIDFromBytes(byte[] name)

Static factory to retrieve a type 3(name based) UUID based on the specified byte array.
9 long node()

This method returns the node value associated with this UUID.
10 static UUID randomUUID()

Static factory to retrieve a type 4(pseudo randomly generated) UUID.
11 long timestamp()

This method returns the timestamp value associated with this UUID.
12 String toString()

This method returns the String object representing this UUID.
13 int variant()

This method returns the variant number associated with this UUID.
14 int version()

This method removes the version number associated with this UUID.

方法继承

此类从以下类继承方法-

  • java.util.Object