Part 2

Once you can load cars into the Ferry, look at other things the Ferry company is interested in:

• knowing how many cars of a certain color are on the Ferry;
• updating the people and car counts correctly when a car leaves the Ferry;
• giving a car 50% discount after three trips on the same ferry. The board method should return ‘half price!’;
• giving a free trip after 7 trips on any Ferry. The board method should return ‘you go free!’