oop/assignment5/Question4/Aircraft.java

/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-04-24
 * Description: Aircraft.java inherited from Vehicle class
 */

public class Aircraft extends Vehicle {
	/**
	 * The altitude at which the aircraft is flying.
	 */
	private int altitude;

	/**
	 * Constructor.
	 *
	 * @param speedLimit the speed limit of the aircraft
	 * @param speed      the speed of the aircraft
	 * @param altitude   the altitude of the aircraft
	 * @throws BadSpeedSetting    if the speed limit is negative
	 * @throws BadAltitudeSetting if the altitude is negative
	 */
	public Aircraft(int speedLimit, int speed, int altitude) throws BadSpeedSetting, BadAltitudeSetting {
		super(speedLimit, speed);
		if (altitude < 0) {
			throw new BadAltitudeSetting("Altitude cannot be negative!");
		}
		this.altitude = altitude;
	}

	/**
	 * Getter of altitude.
	 *
	 * @return the altitude of the aircraft
	 */
	public int getAltitude() {
		return altitude;
	}

	/**
	 * Aircraft can fly.
	 *
	 * @return true
	 */
	@Override
	public boolean canFly() {
		return true;
	}

	/**
	 * Test.
	 */
	public static void testAircraft() {
		try {
			Aircraft aircraft;

			try {
				aircraft = new Aircraft(-10, 10, 10);
			} catch (BadSpeedSetting e) {
				System.out.println(e.getMessage().equals("Speed cannot be negative!"));
			}

			try {
				aircraft = new Aircraft(10, -10, 10);
			} catch (BadSpeedSetting e) {
				System.out.println(e.getMessage().equals("Speed cannot be negative!"));
			}

			try {
				aircraft = new Aircraft(10, 10, -10);
			} catch (BadAltitudeSetting e) {
				System.out.println(e.getMessage().equals("Altitude cannot be negative!"));
			}

			aircraft = new Aircraft(100, 50, 3900);
			System.out.println(aircraft.getAltitude() == 3900);
			System.out.println(aircraft.getSpeed() == 50);
			System.out.println(aircraft.canFly() == true);
			// acceleration
			System.out.println(aircraft.accelerate(10) == 60);
			System.out.println(aircraft.getSpeed() == 60);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(10) == 70);
			System.out.println(aircraft.getSpeed() == 70);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(10) == 80);
			System.out.println(aircraft.getSpeed() == 80);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(10) == 90);
			System.out.println(aircraft.getSpeed() == 90);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(10) == 100);
			System.out.println(aircraft.getSpeed() == 100);
			System.out.println(aircraft.canFly() == true);
			try {
				aircraft.accelerate(10);
			} catch (ExceedSpeedLimit e) {
				System.out.println(e.getMessage().equals(
						"Current speed is 100. Accelerate 10 will exceed the speed limit!"));
			}
			// deceleration
			System.out.println(aircraft.accelerate(-20) == 80);
			System.out.println(aircraft.getSpeed() == 80);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(-20) == 60);
			System.out.println(aircraft.getSpeed() == 60);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(-20) == 40);
			System.out.println(aircraft.getSpeed() == 40);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(-20) == 20);
			System.out.println(aircraft.getSpeed() == 20);
			System.out.println(aircraft.canFly() == true);
			System.out.println(aircraft.accelerate(-20) == 0);
			System.out.println(aircraft.getSpeed() == 0);
			System.out.println(aircraft.canFly() == true);
			try {
				aircraft.accelerate(-20);
			} catch (NotEnoughSpeed e) {
				System.out.println(e.getMessage()
						.equals("Current speed is 0, not enough speed to decelerate!"));
			}

		} catch (Exception e) {
			System.out.println("Error uncaught exception: " + e.getMessage());
		}
	}
}