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| public class ParkingSimulator { | |
| public static void main(String[] args) { | |
| Parking parking = new Parking("駅前駐車場", 2); | |
| Car car1 = new Car("品川33 あ 1234"); | |
| Car car2 = new Car("横浜555 い 5678"); | |
| Car car3 = new Car("多摩345 う 9012"); | |
| car1.park(parking); | |
| car2.park(parking); | |
| car3.park(parking); | |
| car1.exit(); | |
| car3.park(parking); | |
| car1.exit(); | |
| car2.park(parking); | |
| } | |
| } | |
| interface Vehicle { | |
| } | |
| class Parking { | |
| public final String name; | |
| private ParkingSpace[] spaces; | |
| Parking(String name, int capacity) { | |
| this.name = name; | |
| spaces = new ParkingSpace[capacity]; | |
| for (int i = 0; i < capacity; i++) { | |
| spaces[i] = new ParkingSpace(i + 1); | |
| } | |
| } | |
| public ParkingSpace searchAvailableSpace() { | |
| for (var space: spaces) { | |
| if (space.isAvailable()) { | |
| return space; | |
| } | |
| } | |
| return null; | |
| } | |
| } | |
| class ParkingSpace { | |
| public final int number; | |
| private Vehicle vehicle; | |
| ParkingSpace(int number) { | |
| this.number = number; | |
| } | |
| boolean isAvailable() { | |
| return vehicle == null; | |
| } | |
| void park(Vehicle vehicle) throws IllegalStateException { | |
| if (!isAvailable()) { | |
| throw new IllegalStateException("not available"); | |
| } | |
| this.vehicle = vehicle; | |
| } | |
| void exit(Vehicle vehicle) throws IllegalStateException { | |
| if (this.vehicle != vehicle) { | |
| throw new IllegalStateException("not park"); | |
| } | |
| this.vehicle = null; | |
| } | |
| } | |
| class Car implements Vehicle | |
| { | |
| public final String number; | |
| private ParkingSpace parkingSpace; | |
| public Car(final String number) | |
| { | |
| this.number = number; | |
| } | |
| void park(Parking parking) { | |
| if (parkingSpace != null) { | |
| System.out.println("「" + number + "」は既に駐車しています"); | |
| return; | |
| } | |
| parkingSpace = parking.searchAvailableSpace(); | |
| if (parkingSpace == null) { | |
| System.out.println("「" + number + "」は満車で停められませんでした"); | |
| return; | |
| } | |
| parkingSpace.park(this); | |
| System.out.println("「" + number + "」は駐車番号" + parkingSpace.number + "に停めました"); | |
| } | |
| void exit() { | |
| if (parkingSpace == null) { | |
| System.out.println("「" + number + "」は駐車していません"); | |
| return; | |
| } | |
| parkingSpace.exit(this); | |
| parkingSpace = null; | |
| System.out.println("「" + number + "」は出庫しました"); | |
| } | |
| } |
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