Problème affichage résultat

class Point {
	double x;
	double y;
	
	void translate (double dx, double dy) {
		x = x + dx;
		y = y + dy; //expressions cartésiennes de la translation
	}
	double distance(Point p) {
		double dcarree = (x-p.x)*(x-p.x)-(y-p.y)*(y-p.y);
		return Math.sqrt(dcarree);
	}
	
	public static void main (String[]args) {
		Point a = new Point();
		a.x = 3;
		a.y = 2;
		a.translate(5,7);
		a.distance(a);
		
	}
	
}