📜  Java中的 UUID timestamp() 方法及示例

📅  最后修改于: 2022-05-13 01:55:52.055000             🧑  作者: Mango

Java中的 UUID timestamp() 方法及示例

Java中UUID类timestamp()方法一般用于获取与特定UUID关联的戳值。

句法:

public long timestamp()

参数:此方法不带任何参数。

返回值:此方法返回此 UUID 的时间戳值。

异常:如果此 UUID 不是版本 1 UUID 的一部分,此方法将引发UnsupportedOperationException

下面的程序说明了 timestamp() 方法的工作:

方案一:

// 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

方案二:

// 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