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Designing with Patterns

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Class takes the necessary details so that, fr instance, te reservation class associated with the Show class gets on display only the necessary information, wth the rest hidden in the Film class. Tis is a Behavioral Design Pattern and focuses on the communication patterns between objects. Te Observer pattern assumes that the object containing the data is separate from the objects that display the data, ad that these display objects observe changes in that data. When we implement the Observer pattern, w usually refer to the data as and each of the displays as Observers.

Ech of these observers registers its interest in the data by calling a public method in the Subject. Ten, ech observer has a known interface that the subject calls when the data change. Te Subject represents the core (or independent or common or engine) abstraction. Oserver represents the variable (or dependent or optional or user interface) abstraction. Te Subject prompts the Observer objects to do their thing. Ech Observer can call back to the Subject as needed. Tis pattern is depicted in the of the case study as was the case of the Composite design pattern.

Terefore, tis pattern has a definite application in the case study based on the requirements. Lt us look at some of the reasons where it would be necessary to incorporate this pattern: Cnsider the scenario when a reservation is made. Te requirement is that reservation will be cancelled and the ticket made available if the customer fails to pay for the ticket at least 20 minutes before the scheduled time of the show. Te Iterator one the simplest and most frequently used of the design patterns.

Te Iterator pattern allows you to move through a list or collection of data using a standard interface without having to know the details of the internal representations of that data. I addition you can also define special iterators that perform some special processing and return only specified elements of the data collection. A aggregate object such as a list should give you a way to access its elements without exposing its internal structure. Mreover, yu might to traverse list in different ways, dpending on what you need to accomplish.

Bt you probably don’t want to bloat the List interface with operations for different traversals, een if you could anticipate the ones you’ll require. Yu might also need to have more than one traversal pending on the same list. ...

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