Add: a5 close #9

assignment5/Question5/Train.java

@@ -0,0 +1,71 @@
+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-24
+ * Description: Train class inherited from Vehicle class
+ */
+
+public class Train extends Vehicle {
+	/**
+	 * Constructor.
+	 *
+	 * @param speedLimit the speed limit of the train
+	 * @param speed the speed of the train
+	 * @throws BadSpeedSetting
+	 */
+	public Train(int speedLimit, int speed) throws BadSpeedSetting {
+		super(speedLimit, speed);
+	}
+
+	/**
+	 * Train can not fly.
+	 *
+	 * @return false
+	 */
+	@Override
+	public boolean canFly() {
+		return false;
+	}
+
+	/**
+	 * Tain speed can not be changed.
+	 *
+	 * @throws TrainSpeedChange
+	 */
+	@Override
+	public int accelerate(int amount) throws TrainSpeedChange {
+		throw new TrainSpeedChange("Do not try to accelerate or decelerate the train!");
+	}
+
+	/**
+	 * Test.
+	 */
+	public static void testTrain() {
+		try {
+			Train train;
+			try {
+				train = new Train(-1, -1);
+			} catch (BadSpeedSetting e) {
+				System.out.println(e.getMessage().equals("Speed cannot be negative!"));
+			}
+			try {
+				train = new Train(100, -1);
+			} catch (BadSpeedSetting e) {
+				System.out.println(e.getMessage().equals("Speed cannot be negative!"));
+			}
+			try {
+				train = new Train(100, 101);
+			} catch (BadSpeedSetting e) {
+				System.out.println(e.getMessage().equals("Speed cannot be greater than speed limit!"));
+			}
+			train = new Train(100, 50);
+			System.out.println(train.getSpeed() == 50);
+			try {
+				train.accelerate(1);
+			} catch (TrainSpeedChange e) {
+				System.out.println(e.getMessage().equals("Do not try to accelerate or decelerate the train!"));
+			}
+		} catch (Exception e) {
+			System.out.println("Error: uncaught exception " + e.getClass() + ": " + e.getMessage());
+		}
+	}
+}