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PONeed help with classes modeling
 

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  1. PONeed help with classes modeling
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    <p>I've being studying some OO concepts, like design patterns, clean code and some other stuff and i still have some doubts about how to proceed. For instance, lets take a look at my example.</p> <p>I have a Person class that is a model. I want to add some validations to a person, like check if the age corresponds with the birth date and check if the name contains valid characters.</p> <p>I have two approachs, but i dont know wich one i should use.</p> <p>Approach one: I create a new class called: </p> <pre><code>class ValidatePerson {} </code></pre> <p>and the the class have the methods: "validateAge()" and "validateName()" and every vallidation that i need i will have to implement a new method.</p> <p>Approach two: I create a abstract class called: ValidatePerson {} that will have some commum methods to all validation and the i would have:</p> <pre><code>class ValidatePersonAge extends ValidatePerson { validate();} class ValidatePersonName extends ValidatePerson {validate();} </code></pre> <p>I want to choose for approach two, cause every new validation rule that i will have to add will be a new class and wont affect the others. Like, if i need to alter something in the commum method that the new rule needs, i could just overwrite it. On the first approach, i would have to add another method and then create another method or alter the one thats already working for the others, that could make then crash.</p> <p>The thing is that im kind of confused to all this, since im new to programming and i would like to see some help and explanation about it. I've also read that classes should be closed for changing but open for expanding (or something like this).</p>
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    1. COIt is not clear what you are asking here. What _exactly_ are you looking for help with?
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