Advantages/disadvantages of the State pattern

Here are the benefits of the State design pattern:

• In the State design pattern, an object's behavior is the result of the function of its state, and the behavior gets changed at runtime depending on the state. This removes the dependency on the if/else or switch/case conditional logic. For example, in the TV remote scenario, we could have also implemented the behavior by simply writing one class and method that will ask for a parameter and perform an action (switch the TV on/off) with an if/else block.

• With State pattern, the benefits of implementing polymorphic behavior are evident, and it is also easier to add states to support additional behavior.

• The State design pattern also improves Cohesion since state-specific behaviors are aggregated into the ConcreteState classes, which are placed in one location in the code.

• With the State design pattern, it is very easy to add a behavior by just adding one more ConcreteState class. State pattern thus...