What is Servlet interface? Differentiate between GenericServlet and HTTPServlet?

Aggregation is a concept in Object-Oriented Analysis and Design (OOAD) that represents a "has-a" relationship between objects. It is a form of association where one class is made up of one or more classes, but the lifecycle of the included classes is not managed by the container class. In other words, aggregation indicates a whole-part relationship where the part can exist independently of the whole. For example, consider a class `Department` that contains multiple instances of the class `Professor`. Even if a `Department` is deleted, the `Professor` instances can continue to exist or be associated with another department. This reflects the loose coupling characteristic of aggregation.

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