I have a Student class that has to have a property of a String ID, which has to be validated. I’m not sure whether to validate it inside the student class or the class that I’m implementing the Student class in. Does that make sense?
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I have a Student class that has to have a property of a String ID, which has to be validated. I’m not sure whether to validate it inside the student class or the class that I’m implementing the Student class in. Does that make sense?
Assuming ID is final and immutable, then one approach is to have Student constructor throw an exception, probably
new IllegalArgumentException("Invalid student ID");You may additionally provide static method in Student class, which verifies if string is valid, in case you need to check it without creating Student object.
But the logic of determining if ID is valid or not should be in the Student class, I think.
If there are (or can be in future) different kind of student IDs, you could also consider abstract factory pattern, but sounds like that is bit of an overkill.