Question1:

2 3 2 10

Question2a:

public static double measure(double[] a) {
	double sum = 0;
	for (int i = 0; i < a.length; i++) {
		sum += a[i] * a[i];
	}
	return Math.sqrt(sum);
}

Question2b:

public static double[] sum(double[] a, double[] b) {
	double[] c = new double[a.length];
	for (int i = 0; i < c.length; i++) {
		c[i] = a[i] + b[i];
	}
	return c;
}

Question2c:

public static void main(String[] args) {
	double[] a = new double[] {1,3};
	double[] b = new double[] {5,4};
	System.out.println(measure(sum(a,b)));
}

Question3:

public class SimpleScheduler {
	private double totalHours;

	public SimpleScheduler() {
		totalHours = 0;
	}

	public void addProject(String name, double hours) {
		totalHours += hours;
	}

	public double workTime() {
		return totalHours;
	}
	
	public double overTime()
	{
		if (totalHours <= 8)
			return 0;
		return totalHours - 8;
	}
}


Question 4:

public class TicTacToeModel {
	private Cell[][] matrix;

	public TicTacToeModel() {
		matrix = new Cell[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				matrix[i][j] = Cell.FREE;
			}
		}
	}
	
	public Cell getCell(int i, int j) {
		return matrix[i][j];
	}

	public Cell setCell(int i, int j, Cell c) {
		matrix[i][j] = c;
	}
	
	public boolean isWinning() {
		for (int i = 0; i < 3; i++) {
			if (matrix[i][1] != Cell.FREE && matrix[i][0] == matrix[i][1] && matrix[i][1] == matrix[i][2])
				return true;
			if (matrix[1][i] != Cell.FREE && matrix[0][i] == matrix[1][i] && matrix[1][i] == matrix[2][i])
				return true;
		}
		if (matrix[1][1] != Cell.FREE && matrix[0][0] == matrix[1][1] && matrix[1][1] == matrix[2][2])
			return true;
		if (matrix[1][1] != Cell.FREE && matrix[0][2] == matrix[1][1] && matrix[1][1] == matrix[2][0])
			return true;
		return false;
	}
	
	public boolean isFree() {
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				if (matrix[i][j] == Cell.FREE)
					return false;
			}
		}
		return true;
	}
}

Question 5:

public static void walk(Oracle oracle) {
	int x = 0;
	int y = 0;
	for (;;) {
		switch (oracle.guide()) {
		case LEFT:  x--; break;
		case RIGHT: x++; break;
		case UP:    y++; break;
		case DOWN:  y--; break;
		case STOP:  
			System.out.println("("+x+","+y+")");
			return;
		}
	}
}

public class TestOracle implements Oracle {
	private int i;
	private static final Guide[] steps = {LEFT, LEFT, UP, RIGHT, STOP};
	
	public TestOracle() {
		i = 0;
	}
	
	public Guide guide() {
		return steps[i++];
	}
}