Java UUID compareTo()用法及代码示例

Java中UUID类的compareTo()方法用于将一个UUID值与另一个指定的UUID进行比较。如果此UUID小于该值，则返回-1；如果此UUID等于该值，则返回0；如果此UUID大于该值，则返回1。

用法:

UUID_1.compareTo(UUID_2)

参数：该方法采用一个参数UUID_2与UUID_1进行比较。

返回值：根据此UUID_1小于，等于还是大于另一个UUID_2，该方法返回-1、0或1。

以下示例程序旨在说明compareTo()方法的用法：

示例1:检查两个UUID是否相等。

// Java code to illustrate compareTo() 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"); 
  
        UUID UUID_2 
            = UUID 
                  .fromString( 
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c"); 
  
        // Displaying the UUID values 
        System.out.println("UUID_1: "
                           + UUID_1.clockSequence()); 
        System.out.println("UUID_2: "
                           + UUID_2.clockSequence()); 
  
        // Comparing both the UUIDs 
        System.out.println("Comparison Value: "
                           + UUID_1.compareTo(UUID_2)); 
    } 
}

输出：

UUID_1: 14534
UUID_2: 14534
Comparison Value: 0

示例2:当UUID_1小于UUID_2时，该方法返回-1。

// Java code to illustrate compareTo() 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"); 
  
        UUID UUID_2 
            = UUID 
                  .fromString( 
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c"); 
  
        // Displaying the UUID values 
        System.out.println("UUID_1: "
                           + UUID_1.clockSequence()); 
        System.out.println("UUID_2: "
                           + UUID_2.clockSequence()); 
  
        // Comparing both the UUIDs 
        System.out.println("Comparison Value: "
                           + UUID_1.compareTo(UUID_2)); 
    } 
}

输出：

UUID_1: 5737
UUID_2: 14534
Comparison Value: -1

示例3:当UUID_1大于UUID_2时，该方法返回1。

// Java code to illustrate compareTo() 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"); 
  
        UUID UUID_2 
            = UUID 
                  .fromString( 
                      "58e0a7d7-eebc-11d8-9669-0800200c9a66"); 
  
        // Displaying the UUID values 
        System.out.println("UUID_1: "
                           + UUID_1.clockSequence()); 
        System.out.println("UUID_2: "
                           + UUID_2.clockSequence()); 
  
        // Comparing both the UUIDs 
        System.out.println("Comparison Value: "
                           + UUID_1.compareTo(UUID_2)); 
    } 
}

输出：

UUID_1: 14534
UUID_2: 5737
Comparison Value: 1

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 UUID compareTo() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。