Question

Typically, the employment of the State pattern involves

a) one concrete class per state
b) an abstract superclass for all the concrete state classes
c) a context
d) all of the above

Answer 1

The State design pattern in software engineering typically involves one concrete class per state, an abstract superclass for all concrete state classes, and a context class—which is d) all of the above.

Step-by-step explanation:

The question 'Typically, the employment of the State pattern involves what?' relates to design patterns in software engineering, specifically the State design pattern. The correct answer is d) all of the above. The State pattern usually involves:

1. One concrete class per state: Each state is represented by its own class that encapsulates the behavior associated with that state.
2. An abstract superclass for all the concrete state classes: This superclass defines the interface that all concrete state classes must implement. It acts as a common type for all state objects.
3. A context: This is the class that has a state that varies over time. The context class contains a reference to the current state object and delegates state-specific behavior to it.

By employing the State pattern, a system can change its behavior dynamically depending on its internal state, making the system more modular and easier to maintain and extend.