Can data classes contain methods for validation?

OK, say I have a data class for a user:

How to apply verification and validation on the following example

I have been following verification and validation questions here with my colleagues, yet we are unable to see the slight differences, probably caused by language barrier in technical English.

Validation and Verification explanation (Boehm) – I cannot understand its point

Hopefully my last thread about V&V as I found the B.Boehm is text which I just do not understand well (likely my technical English is not that good).

Why some consider static analysis a testing and some do not?

Preparing myself also to ISTQB certification, I found they call static analysis actually as a static testing, while some engineering book distinct between static analysis and testing, which is the dynamic activity. I tent to think that static analysis is not a testing in the true sense as it does not test, it checks/verifies. But sure I would love to hear opinion of the true experts here.
Thank you

Validating User Stories: How much change is too much?

While the core of requirements development and acceptance criteria would ideally take place during the planning meeting in order to create a better estimate, Scrum encourages continuous interaction with the product owner throughout the sprint to validate and refine user stories.

Mobile number validation

I am trying to find best way to validate a mobile number with in a country.

Referential integrity in a database where tuples are not physically deleted

Many modern Relational Database Management Systems automatically support referential integrity, i.e. when you try to delete a tuple which has a reference (in the form of foreign key, for example), the DBMS doesn’t complete the operation and brings an error.

Name for sanitizing at the right time?

Recently we had an issue on our site where someone attempted SQL injection via a cookie (we’ll call it lastID). NOC was in a frenzy and angry about how the cookie as an attack vector could be ignored. They had a developer create a class for managing cookies that will sanitize lastID (and eventually other cookies) to check that it is numeric.

Class structure/pattern for validating several different Excel templates?

I’m trying to validate the contents of Excel sheets that follow several different templates. For each one, there are three possible validation actions for various cells:

Better to use error monad with validation in your monadic functions, or implement your own monad with validation directly in your bind?

I’m wondering what’s better design wise for usability/maintainability, and what’s better as far as fitting with the community.