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Labs/Lab9/Lab9_2230026071/Question5/src/BadCarException.java

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+
+public class BadCarException extends Exception {
+	public BadCarException() {
+		super("A car must have at least one door!");
+	}
+}

Labs/Lab9/Lab9_2230026071/Question5/src/BadDoorException.java

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+
+public class BadDoorException extends Exception {
+	public BadDoorException(int doorNumber) {
+		super("Door " + doorNumber + " does not exist!");
+	}
+}

Labs/Lab9/Lab9_2230026071/Question5/src/Car.java

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+
+public class Car {
+	//instance variable
+	private String name;
+	private Door[] doors;
+	
+	//constructor
+	public Car(String name, int numberOfDoors) throws BadCarException {
+		this.name = name;
+		if(numberOfDoors > 1) {
+			this.doors = new Door[numberOfDoors];
+			for(int i = 0; i < this.doors.length; ++i)
+				doors[i] = new Door();
+		}
+		else throw new BadCarException();
+	}
+	
+	//methods
+	public void listDoors() {
+		for(Door d: doors) {
+			if(d.isOpen())
+				System.out.println(this.name + ": door is open.");
+			else
+				System.out.println(this.name + ": door is closed.");
+		}
+	}
+	
+	public int countOpenDoors() {
+		int cnt = 0;
+		for(Door d: doors)
+			if(d.isOpen()) ++cnt;
+		return cnt;
+	}
+	
+	public void openOneDoor(int doorNumber) throws BadDoorException {
+		if(doorNumber > 0 && doorNumber <= this.doors.length)
+			this.doors[doorNumber - 1].open();
+		else throw new BadDoorException(doorNumber);
+	}
+	
+	public void changeAllDoors() {
+		for(int i = 0; i < this.doors.length; ++i) {
+			if(this.doors[i].isOpen()) this.doors[i].close();
+			else this.doors[i].open();
+		}
+	}
+	
+	public void replaceDoor(int doorNumber) throws BadDoorException {
+		if(doorNumber > 0 && doorNumber <= this.doors.length)
+			this.doors[doorNumber - 1] = new Door();
+		else throw new BadDoorException(doorNumber);
+	}
+	
+	public void replaceAllDoors() {
+		for(int i = 0; i < this.doors.length; ++i) {
+			this.doors[i] = new Door();
+		}
+	}
+	
+	public void replaceManyDoors(int numOfDoorsToReplace) {
+		//IndexOutOfBoundsException may occur when replace number > door number
+		for(int i = 0; i < numOfDoorsToReplace; ++i) {
+			this.doors[i] = new Door();
+		}
+	}
+	
+	//test
+	public static void testCar() {
+		try {
+		Car brokencar = new Car("Broken", 0);
+		} catch(BadCarException ex) {
+		System.out.println(ex.getMessage() == "A car must have at least one door!");
+		}
+		Car c = null;
+		try {
+		c = new Car("Biggy", 7);
+		} catch(BadCarException ex) {
+		System.out.println("BUG! This must never happen!");
+		}
+		c.listDoors();
+		System.out.println(c.countOpenDoors() == 0);
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 7);
+		c.listDoors();
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 0);
+		try {
+		c.openOneDoor(8);
+		} catch(BadDoorException ex) {
+		System.out.println(ex.getMessage().equals("Door 8 does not exist!"));
+		}
+		try {
+		c.openOneDoor(3);
+		} catch(BadDoorException ex) {
+		System.out.println("BUG! This must never happen!");
+		}
+		System.out.println(c.countOpenDoors() == 1);
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 6);
+		c.listDoors();
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 1);
+		c.listDoors();
+		try {
+		c.replaceDoor(8);
+		} catch(BadDoorException ex) {
+		System.out.println(ex.getMessage().equals("Door 8 does not exist!"));
+		}
+		try {
+		c.replaceDoor(3);
+		} catch(BadDoorException ex) {
+		System.out.println("BUG! This must never happen!");
+		}
+		System.out.println(c.countOpenDoors() == 0);
+		c.listDoors();
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 7);
+		c.listDoors();
+		c.replaceAllDoors();
+		System.out.println(c.countOpenDoors() == 0);
+		c.listDoors();
+		c.changeAllDoors();
+		System.out.println(c.countOpenDoors() == 7);
+		c.listDoors();
+		c.replaceManyDoors(4);
+		System.out.println(c.countOpenDoors() == 3);
+		c.listDoors();
+		try {
+		c.replaceManyDoors(20);
+		} catch(ArrayIndexOutOfBoundsException ex) {
+		System.out.println(ex.getMessage().equals("Index 7 out of bounds for length 7"));
+		}
+		System.out.println(c.countOpenDoors() == 0);
+		c.listDoors();
+	}
+
+}

Labs/Lab9/Lab9_2230026071/Question5/src/Door.java

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+
+public class Door {
+	//instance variable
+	private boolean isOpen;
+	
+	//constructor
+	public Door() {
+		this.isOpen = false;
+	}
+	
+	//method
+	public boolean isOpen() {return this.isOpen;}
+	
+	public void open() {this.isOpen = true;}
+	
+	public void close() {this.isOpen = false;}
+	
+	//test
+	public static void testDoor() {
+		Door d = new Door();
+		System.out.println(d.isOpen() == false);
+		d.close();
+		System.out.println(d.isOpen() == false);
+		d.open();
+		System.out.println(d.isOpen() == true);
+	}
+}

Labs/Lab9/Lab9_2230026071/Question5/src/Start.java

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+
+public class Start {
+
+	public static void main(String[] args) {
+		Door.testDoor();
+		Car.testCar();
+	}
+
+}