Grokking the Object Oriented Design Interview
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Keeping the Design Honest with SOLID

You have a class diagram. It is complete and it may still be a poor design.

SOLID is five rules that catch the common ways a class diagram goes wrong. The name is five initials, one per rule. This lesson is not a tour of the theory. It is five checks you can run over the diagram you just drew, in about five minutes.

Run the five checks in this order

Single responsibility. A class should have one reason to change.

Read each class name and say what it is responsible for. If the sentence needs an "and", the class is doing two jobs. A `ParkingLot

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