Question about objects

Hey guys, i'm having some trouble with this:

In the object "consumer" i need to do a validation for开发者_StackOverflow the property Nit.

But i don't know where to put this validation.

Do i have to put it where i set the value,

In a public function to validate the content before setting the value,

or a method inside the object "validateNit"

I'm still learning and i have that doubt.

Ty so much for your help, and sorry about the crappy English.

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if the property is set just once on initialization, then validate it during object initialization, with a method validateNit. if it can be set/modified at any time with, say, a setNit(newNit) method, you can call validateNit() from setNit().