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Developer’s toolbox: State Design Pattern

Developer’s toolbox: State Design Pattern

It lets you change the behavior of a class when the state changes.

Wikipedia says:
The state pattern is a behavioral software design pattern that allows an object to alter its behavior when its internal state changes. This pattern is close to the concept of finite-state machines. The state pattern can be interpreted as a strategy pattern, which is able to switch a strategy through invocations of methods defined in the pattern’s interface.

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