Home/ Questions/Q 8802459
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-14T01:05:43+00:00

For example, I have two object, which a the class, Person. Person A: User_name:n1

  • 0

For example, I have two object, which a the class, Person.

Person A:
User_name:n1
Password:1234
Email:n1@email.com

Person B:
User_name:n1
Password:1234
Email:n1@email.com

Because both Person A and Person B have same values, so, I would like to write my own isValueEqual function. first, I want to compare their classes, then, I campare their value one by one to check whether it is equal. I think this way is super time consuming. So, I think is this reliable to make it become a JSON string, and use the md5 to hash them, and compare the hash only. So, is this a better approach for comparing their value? Thanks.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    To explain what Jim Garrison explains in this comment in more details, just consider the work necessary to implement equals by comparing the fields, and the work necessary to implement it by generating a hash and comparing the hashes. Let’s take your example, with A and B differing only by the last letter of their email (which is the worst case).

    First method:

    • iterate through all the name characters and compare them
    • iterate through all the password characters and compare them
    • iterate through all the email characters and compare them.

    Second method:

    • create two new StringBuilders
    • iterate through all the name characters to fill the name in the JSON strings, and append them to the StringBuilder, surrounded by quotes, with special characters escaped, etc.
    • iterate through all the password characters to fill the password in the JSON strings, and append them to the StringBuilder, surrounded by quotes, with special characters escaped, etc.
    • iterate through all the email characters to fill the email in the JSON strings, and append them to the StringBuilder, surrounded by quotes, with special characters escaped, etc.
    • transform the StringBuilders to Strings
    • transform the Strings to byte arrays
    • apply a complex cryptographic function to both byte arrays
    • iterate through each byte array and compare the bytes.

    Note that if the persons differ by the first character or the length of their name, the first method stops immediately, whereas the second one must do every step.

    • 0