A simple Oyster (London public transport) implementation.
Build with maven (mvn clean package). Then run with Java: java -jar oyster-0.0.1-SNAPSHOT.jar
All bus journeys cost £1.80.
The maximum possible fare is charged (£3.20) upon entering a tube station. That fare is then refunded, and the actual amount calculated upon leaving a station. When the fare is ambiguous due to a station being in two zones, the cheapest possible fare is given to the user.
Stations and Zones:
Holborn - 1
Earl's Court - 1, 2
Wimbledon - 3
Hammersmith - 2
Prices:
Across only Zone 1: £2.50
Across any single zone, not including Zone 1: £2.00
Across two zones including Zone 1: £3.00
Across two zones, not including Zone 1: £2.25
Across any three zones: £3.20