PuntoConErrori

public class Punto {
        private final double x;
        private final double y;

        public Punto() {x = 0.0; y = 0.0;}
        public Punto(double x, double y) {this.x = x;this.y = x; }

        public double x() { return x; }
        public double y() { return y; }

        public double distanzaDa(Punto p) {
            double dx = this.x() - x();
            double dy = this.y() - y();
            return Math.sqrt(dx*dx + dy*dy);
        }

        public String toString() { return "(" + x + ", " + y + "}";  }

}