Java UUID timestamp()方法及示例

Java中UUID类的timestamp()方法通常用于获取与某一UUID相关的邮票值。

语法

public long timestamp()

参数： 该方法不接受任何参数。

返回值 ：该方法返回该UUID的时间戳值。

异常： 如果这个UUID不是第一版UUID的一部分，这个方法会抛出UnsupportedOperationException。

以下程序说明了timestamp()方法的工作。

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());
    }
}

输出:

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());
    }
}

输出:

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