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After getting introduced to Design Patterns we have so far examined the following patterns:

• Adapter Pattern
• Facade pattern
• Composite Pattern
• Bridge Pattern
• Singleton Pattern
• Observer Pattern
• Proxy Pattern
• Chain of Responsibility Pattern
• Flyweight Pattern
• Builder Pattern
• Factory Method Pattern
• Abstract Factory Design Pattern
• Prototype Design Pattern
• Memento Design Pattern
• Template Design Pattern

Now, we will now get to know the State Design Pattern.

The State Design Pattern allows an object to alter its behavior when its internal state changes. The object will appear to change its class. The state of an object can be defined as its exact condition at any given point of time, depending on the values of its properties or attributes. The set of methods implemented by a class constitutes the behavior of its instances. Whenever there is a change in the values of its attributes, we say that the state of an object has changed.

Via a real life example, you will learn how and when the State design pattern should be used and how to structure your code in order to implement it. You will see how it can lead to elegant solutions to code problems.

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