Java code implementation for the registration and login functionality with txt file as our database

The main method presents the user with a menu of options to either register or login, and also provides an option to exit the program.

Note that this implementation stores the credentials in a text file, which is not a secure way to store sensitive information such as passwords. In practice, a more secure method such as hashing and salting should be used to store passwords.

[ryanchico]

Sir, what if multiple accounts have been registered? Do validations still work in log in method?