Behavioral Design Patterns in C++ - Lamp - IV (Yellow State)

The video tutorial explains how to add a new state, 'yellow', to a lamp using the state pattern. It highlights the simplicity of adding new states without modifying existing code, but also points out the issue of tight coupling between state classes. The tutorial suggests using a factory method to reduce dependencies, which will be covered in the next lecture.

What happens when the lamp is in the yellow state and the on button is pressed?

• The lamp transitions to the gray state.

• The lamp remains in the yellow state.

• The lamp transitions to the white state.

• The lamp transitions to the off state.

Why is adding new states simpler with the state pattern?

• Because it requires no changes to the existing code.

• Because it eliminates the need for conditional statements.

• Because it allows for more complex state transitions.

• Because it uses a single state class for all states.

What is the main issue with the current state class implementation?

• There is tight coupling between the state classes.

• The state classes are not documented.

• The state classes are too complex.

• The state classes are not reusable.

What causes the dependency between state classes?

• The use of inheritance.

• The use of static methods.

• The use of the new operator.

• The use of global variables.

What solution is proposed to reduce the dependency between state classes?

• Using a singleton pattern.

• Using a decorator pattern.

• Using a factory method.

• Using a proxy pattern.