The Sedan needs to satisfy more than the highway patrol’s rules (the IAutomobile interface). The car designers have asked that sedans are built and move in certain ways — it must have constructors and methods that aren’t required by the IAutomobile interface. This is okay in C#! The interface says what a class MUST have. It does not say what a class MUST NOT have.
In fact, interfaces cannot specify two types of members that are commonly found in classes:
- Constructors
- Fields
Instructions
Add a constructor to the Sedan class with one parameter, speed, of type double. It should
- set the
Speedproperty tospeed - set a random
LicensePlatevalue - set
Wheelsto 4
To make a random license plate, a utility class is provided for you. Use it in the constructor like so: Tools.GenerateLicensePlate().
Add a void SpeedUp() method that increases the Speed property by 5.
Did you get an error? There is no setter for the Speed property. Add a private setter such as private set to the Speed property.
Add a void SlowDown() method that decreases the Speed by 5.