125 lines
2.8 KiB
Java
125 lines
2.8 KiB
Java
/*
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* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
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* Date: 2022-04-21
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* Description: This is the class of Door.
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*/
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public class Car {
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private String name;
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private Door[] doors;
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/**
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* Constructor.
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*
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* @param name The name of the car.
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* @param numberOfDoors The number of doors.
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* @throws BadCarException If the number of doors is less than 1.
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*/
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public Car(String name, int numberOfDoors) throws BadCarException {
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if (numberOfDoors < 1) {
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throw new BadCarException("A car must have at least one door!");
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}
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this.name = name;
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// initialise the doors array
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doors = new Door[numberOfDoors];
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for (int i = 0; i < numberOfDoors; i++) {
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doors[i] = new Door();
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}
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}
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/**
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* Prints each door of the car.
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*/
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public void listDoors() {
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for (Door door : doors) {
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System.out.println(String.format("%s: door is %s", name, door.isOpen() ? "open" : "closed"));
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}
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}
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/**
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* Count the numer of open doors.
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*
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* @return The number of open doors.
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*/
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public int countOpenDoors() {
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int count = 0;
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for (Door door : doors) {
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if (door.isOpen()) {
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count++;
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}
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}
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return count;
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}
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/**
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* Open one door with number start from 1.
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*
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* @param doorNumber The number of the door to open start from 1.
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* @throws BadDoorException If try to open a non-existed door.
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*/
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public void openOneDoor(int doorNumber) throws BadDoorException {
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doorNumber--;
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if (doorNumber < 0 || doorNumber >= doors.length || doors[doorNumber] == null) {
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throw new BadDoorException(String.format("Door %d does not exist!", doorNumber + 1));
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}
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doors[doorNumber].open();
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}
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/**
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* Open all the closed doors and closes all the open doors.
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*/
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public void changeAllDoors() {
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for (Door door : doors) {
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if (door.isOpen()) {
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door.close();
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} else {
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door.open();
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}
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}
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}
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/**
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* Test.
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*/
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public static void testCar() {
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try {
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Car brokencar = new Car("Broken", 0);
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} catch (BadCarException ex) {
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System.out.println(ex.getMessage() == "A car must have at least one door!");
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}
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Car c = null;
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try {
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c = new Car("Biggy", 7);
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} catch (BadCarException ex) {
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System.out.println("BUG! This must never happen!");
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}
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c.listDoors();
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System.out.println(c.countOpenDoors() == 0);
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c.changeAllDoors();
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System.out.println(c.countOpenDoors() == 7);
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c.listDoors();
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c.changeAllDoors();
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System.out.println(c.countOpenDoors() == 0);
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try {
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c.openOneDoor(8);
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} catch (BadDoorException ex) {
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System.out.println(ex.getMessage().equals("Door 8 does not exist!"));
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}
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try {
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c.openOneDoor(3);
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} catch (BadDoorException ex) {
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System.out.println("BUG! This must never happen!");
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}
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System.out.println(c.countOpenDoors() == 1);
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c.changeAllDoors();
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System.out.println(c.countOpenDoors() == 6);
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c.listDoors();
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c.changeAllDoors();
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System.out.println(c.countOpenDoors() == 1);
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c.listDoors();
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}
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}
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