Java 中的 UUID 时间戳()方法，示例

原文:https://www . geesforgeks . org/uuid-timestamp-in-Java-method-with-examples/

Java 中 UUID 类的时间戳()方法一般用于获取与特定 UUID 相关联的时间戳值。

语法:

public long timestamp()

参数:该方法不取任何参数。

返回值:该方法返回该 UUID 的时间戳值。

异常:如果这个 UUID 不是版本 1 UUID 的一部分，这个方法抛出不支持操作异常。

下面的程序说明了 timestamp()方法的工作原理:

程序 1:

// Java code to illustrate timestamp() method

import java.util.*;

public class UUID_Demo {
    public static void main(String[] args)
    {

        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "58e0a7d7-eebc-11d8-9669-0800200c9a66");

        // Displaying the UUID
        System.out.println("UUID: "
                           + UUID_1);

        // Displaying the timestamp value
        System.out.println("The timestamp value is: "
                           + UUID_1.timestamp());
    }
}

Output:

UUID: 58e0a7d7-eebc-11d8-9669-0800200c9a66
The timestamp value is: 133118681719810007

程序 2:

// Java code to illustrate timestamp() method

import java.util.*;

public class UUID_Demo {
    public static void main(String[] args)
    {

        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c");

        // Displaying the UUID
        System.out.println("UUID: "
                           + UUID_1);

        // Displaying the timestamp Value
        System.out.println("The timestamp value is: "
                           + UUID_1.timestamp());
    }
}

Output:

UUID: 5fc03087-d265-11e7-b8c6-83e29cd24f4c
The timestamp value is: 137309646498050183

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