Java UUID getMostSignificantBits()方法及实例

UUIDs是128位的值。Java中UUID类的getMostSignificantBits()方法被用来获取该UUID最重要的64位。

语法

public long getMostSignificantBits()

参数： 该方法不接受任何参数。

返回值： 该方法返回一个整数值，它是这个128位UUID的最重要的64位。

下面的程序说明了getMostSignificantBits()方法的工作。

程序1 :

// Java code to illustrate
// getMostSignificantBits() 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 value of UUID
        System.out.println("The value is: "
                           + UUID_1.clockSequence());
  
        // Getting the most significant 64 bit
        System.out.println("The most significant 64 bit: "
                           + UUID_1
                                 .getMostSignificantBits());
    }
}

输出:

UUID: 58e0a7d7-eebc-11d8-9669-0800200c9a66
The value is: 5737
The most significant 64 bit: 6404303215985955288

程序2

// Java code to illustrate
// getMostSignificantBits() 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 value of UUID
        System.out.println("The value is: "
                           + UUID_1.clockSequence());
  
        // Getting the most significant 64 bit
        System.out.println("The most significant 64 bit: "
                           + UUID_1.getMostSignificantBits());
    }
}

输出:

UUID: 58e0a7d7-eebc-11d8-9669-0800200c9a66
The value is: 5737
The most significant 64 bit: 6404303215985955288