The fast food restaurant also offers value meals. A value meal a drink and a foo

Question

The fast food restaurant also offers value meals. A value meal a drink and a food item purchased at the same time. A 10% discount off the full price of purchasing each separately is applied to the price of a value meal. A deluxe value meal costs $0.50 more than a value meal and includes apple pie for dessert. Which of the following is the best choice for this system design? Why? a. DeluxeValueMeal should be a subclass of ValueMeal. b. ValueMeal should be a subclass of DeluxeValueMeal. c. Both DeluxeValueMeal and ValueMeal should be separate classes that have no inheritance relationship. d. ValueMeal has an association (has-a) relationship with DeluxeValueMeal. e. ValueMeal and DeluxeValueMeal both have an instance field of type Meal which is a superclass of both value Meal and DeluxeValueMeal.

Explanation / Answer

a. DeluxeValueMeal should be a subclass of ValueMeal

The reason is that DeluxeValueMeal adds more functionality to the ValueMeal. ValueMeal provides 10% discount off the full-pricing and DeluxeValueMeal does the same but adds it's own features too.

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