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The Memento captures and externalizes an object's internal state so that the object can later be restored to that state.
The Observer defines a one-to-many relationship so that when one object changes state, the others are notified and updated automatically.
The State pattern allows an object to change its behavior when its internal state changes.
Strategy Design Pattern — Define a family of algorithms, encapsulate each one, and make them interchangeable — http://bit.ly/dSF4x
Strategy lets the algorithm vary independently from clients that use it Capture the abstraction in an interface, bury implementation details
Template Method defines a skeleton of an algorithm in an operation, and defers some steps to subclasses.
Visitor pattern represents operation to be performed on elements of an object structure without changing the classes on which it operates.
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