Java UUID equals()用法及代碼示例

Java中UUID類的equals()方法用於檢查一個UUID與另一個UUID是否相等。如果兩個UUID一點一點地完全相同，則該方法返回True。

用法:

public boolean equals(Object uuidObj)

參數：該方法采用一個參數uuidObj與UUID_1進行比較。

返回值：如果兩個UUID都相同，則該方法返回true，否則返回false。

以下示例程序旨在說明equals()方法的用法：

示例1:

// Java code to illustrate equals() 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("Are both UUID equal: "
                           + UUID_1.equals(UUID_2)); 
    } 
}

輸出：

UUID_1: 14534
UUID_2: 14534
Are both UUID equal: true

示例2:

// Java code to illustrate equals() 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("Are both UUID equal: "
                           + UUID_1.equals(UUID_2)); 
    } 
}

輸出：

UUID_1: 14534
UUID_2: 5737
Are both UUID equal: false

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 equals() 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。