Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Consultation in object-oriented programming occurs when an object's method implementation consists of a message send of the same message to another constituent object.In this example, the add method of CustomerList consults the List instance to implement the semantics of adding a value to the list. Consultation can be very useful if extra conditions or side-effects have to occur on the method invocations. For instance in this example, the add method can be used to check if the customer is not yet in the list, and to check for non-null customer object.

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