Java UUID compareTo()用法及代碼示例

Java中UUID類的compareTo()方法用於將一個UUID值與另一個指定的UUID進行比較。如果此UUID小於該值，則返回-1；如果此UUID等於該值，則返回0；如果此UUID大於該值，則返回1。

用法:

UUID_1.compareTo(UUID_2)

參數：該方法采用一個參數UUID_2與UUID_1進行比較。

返回值：根據此UUID_1小於，等於還是大於另一個UUID_2，該方法返回-1、0或1。

以下示例程序旨在說明compareTo()方法的用法：

示例1:檢查兩個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)); 
    } 
}

輸出：

UUID_1: 14534
UUID_2: 14534
Comparison Value: 0

示例2:當UUID_1小於UUID_2時，該方法返回-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)); 
    } 
}

輸出：

UUID_1: 5737
UUID_2: 14534
Comparison Value: -1

示例3:當UUID_1大於UUID_2時，該方法返回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)); 
    } 
}

輸出：

UUID_1: 14534
UUID_2: 5737
Comparison Value: 1

相關用法

注：本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 UUID compareTo() Method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。