Method that calculates the area of the polygon formed by the given list of Location objects

gistfile1.txt

public double areaPoly(ArrayList<Location> places){
  	int[] x = new int[places.size()];
		int[] y = new int[places.size()];
		for (int i = 0; i<places.size(); i++){
			x[i] = LocationToEN(places.get(i))[0];
			y[i] = LocationToEN(places.get(i))[1];
		}

		double area = 0.0;
		int j = x.length-1;
		for(int i = 0; i < x.length; i++) {
			area = area + (x[j]+x[i]) * (y[j]-y[i]);
			j = i;
		}
		area = area/2;
		if (area < 0)
			area = area * -1;
		return area;

	}
public int[] LocationToEN (Location location){
		float lat = (float) location.getLatitude();
		float lon = (float) location.getLongitude();
		System.out.println("Coordinates: " + lat + "," + lon);
		int[] eastingsAndNorthings = new int[2];
		uk.me.jstott.jcoord.LatLng coords = new uk.me.jstott.jcoord.LatLng(lat,lon);
		UTMRef UTMEN = coords.toUTMRef();
		eastingsAndNorthings[0]=(int)UTMEN.getEasting();
		eastingsAndNorthings[1]=(int)UTMEN.getNorthing();
		System.out.println("E/N: " + UTMEN.toString());
		System.out.println("Calc: " + eastingsAndNorthings[0]);
		return eastingsAndNorthings;
	}