DP Computer Science Questionbank

With reference to both class UMLs provided above, distinguish between a class and an instantiation.

Outline one disadvantage of using aggregation in this context.

Outline one advantage of using aggregation in this context.

Construct a diagram showing the relationships between the Payment, FoodItem, DrinkItem, and Item classes. You do not need to include the names of attributes or methods.

State the relationship between the Flight object and the Arrival object.

Outline the general nature of an object.

Construct a UML diagram to represent the Arrival object.

Distinguish between a class and an instantiation. You must make reference to the UML provided.

Outline why the variable active in the UML of the class POSline was defined as a boolean data type.

State the relationship between the POSsystem and POSline objects.

Draw a diagram to show the relationship between the objects POSsystem, POSline and Cart. You are not required to draw a complete UML diagram.

Describe the relationship between the classes Vehicle and ParkingArea.

Construct a UML diagram that shows the relationships between the ParkingArea, Vehicle, Motorbike and Car classes. There is no need to include the attributes or methods of each class.

Construct a UML diagram for the Visits class.