if(position[0]>field[0]||position[1]>field[1]){

public class Tractor {

	private Point position = new Point(0, 0);
	private int fieldSizeX = 5;
	private int fieldSizeY = 5;
	private Vector orientation = new Vector(0, -1);
	
	private static final String[] ORIENTATION = new String[] {
		" ", "N", " ",
		"W", " ", "E",
		" ", "S", " "
	};
	
	public void move(String command) {
		if(command=="F"){
			moveForwards();
		}else if(command=="T"){
			turnClockwise();
		}
	}
	
	public int getPositionX() {
		return position.x;
	}

	public int getPositionY() {
		return position.y;
	}

	public String getOrientation() {
		return ORIENTATION[position.x + 1 + (position.y + 1) * 3 ];
	}

	private void moveForwards() {
		Point newPosition = position.add(orientation);
		
		if (!newPosition.in(0, 0, fieldSizeX - 1, fieldSizeY - 1)) {
			throw new TractorInDitchException();
		}
		position = newPosition;
	}

	private void turnClockwise() {
		orientation = orientation.rotateClockwise90();
	}
	
	private static class Vector {
		public final int x, y;
		public Vector(int x, int y) {
			this.x = x;
			this.y = y;
		}
		public Vector rotateClockwise90() {
			return new Vector(-y, x);
		}
	}
	
	private static class Point {
		public final int x, y;
		public Point(int x, int y) {
			this.x = x;
			this.y = y;
		}
		
		public Point add(Vector v) {
			return new Point(x + v.x, y + v.y);
		}
		
		public boolean in(int x1, int y1, int x2, int y2) {
			return x >= x1 && x <= x2 && y >= y1 && y <= y2;
		}
	}
}