Question 1. 

1
8
0
8
2
0
1
5

Question 2.

public class Question2 {
	public static int getRangeSize(int[] a) {
		if (a.length == 0)
			return 0;

		int min = Integer.MAX_VALUE;
		int max = Integer.MIN_VALUE;
		for (int i = 0; i < a.length; i++) {
			if (min > a[i])
				min = a[i];
			if (max < a[i])
				max = a[i];
		}
		return (max-min);
	}
	
	public static void main(String[] args) {
		int a[] = new int[args.length];
		for (int i = 0; i < args.length; i++) {
			a[i] = Integer.parseInt(args[i]);
		}
		System.out.println(getRangeSize(a));
	}
}

Question 3.

public class Turtle {
	int x, y;
	Direction dir;
	
	public Turtle() {
		x = 0;
		y = 0;
		dir = Direction.NORTH;
	}
	
	public void turnLeft() {
		switch (dir) {
		case NORTH:
			dir = Direction.WEST;
			break;
		case SOUTH:
			dir = Direction.EAST;
			break;
		case EAST:
			dir = Direction.NORTH;
			break;
		case WEST:
			dir = Direction.SOUTH;
			break;
		}
	}

	public void forward(int steps) {
		switch (dir) {
		case NORTH:
			y += steps;
			break;
		case SOUTH:
			y -= steps;
			break;
		case EAST:
			x += steps;
			break;
		case WEST:
			x -= steps;
			break;
		}
	}
}

Question 4.

public static void shuffle(int[] a) {
	for (int i = a.length-1; i > 0; i--) {
		int j = (int) (Math.random()*(i+1));
		int tmp = a[i];
		a[i] = a[j];
		a[j] = tmp;
	}
}

Question 5.

public 	static List loadStudents(File file) throws FileNotFoundException
{
	List students = new ArrayList();
	Scanner scanner = new Scanner(file);
	
	while (scanner.hasNext()) {
		String name = scanner.next();
		Student student = new Student(name);
		
		int courses = scanner.nextInt();
		for (int i = 0; i < courses; i++) {
			String course = scanner.next();
			int grade = scanner.nextInt();
			student.addCourse(course,grade);
		}
		
		students.add(student);
	}

	return students;
}