STRATEGY Object Behavioral Pattern. You are at the Pub two weeks before Fall Formal and still don’t have a date! All of a sudden a girl who you had a.

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Presentation transcript:

STRATEGY Object Behavioral Pattern

You are at the Pub two weeks before Fall Formal and still don’t have a date! All of a sudden a girl who you had a crush on during o-week walks in There are many different ways that you could approach this situation. Each approach requires a different methodology, but achieves the same goal (i.e. you have confronted your crush)

How you doin?

Do you believe in love at first sight or should I walk around the room again?

Intent of Strategy Define a family of algorithms, encapsulate each one, and make them interchangeable Define a family of algorithms, encapsulate each one, and make them interchangeable Strategy provides a common interface for all encapsulated algorithms and allows the algorithm to vary independently of the client Strategy provides a common interface for all encapsulated algorithms and allows the algorithm to vary independently of the client

When is Strategy used? When many related classes differ only in their behavior When many related classes differ only in their behavior Different variants of an algorithm exist in order to reflect different space/time trade- offs Different variants of an algorithm exist in order to reflect different space/time trade- offs

Structure

Airline Ticket Reservations Airline Ticket Reservations There are many different ways to obtain an airline ticket. Depending on your utility for time and money, you may be looking for the cheapest flight available or you might want to find the quickest flight to your destination. There are many different ways to obtain an airline ticket. Depending on your utility for time and money, you may be looking for the cheapest flight available or you might want to find the quickest flight to your destination.

Airline Ticket Reservations Airline Ticket Reservations