/** Rappresenta un punto nel piano cartesiano (a coordinate double) */

public class Punto {

	private double x, y;
	
	/** Costruttori */
	public Punto ( double x, double y ) {
		this.x = x;
		this.y = y;
	}
	
	public Punto () {
		this(0.0, 0.0);
	}
	
	/** Metodi */
	
	/** Metodi set/get */
	public void setX ( double x )  {
		this.x = x;
	}
	
	public void setY ( double y )  {
		this.y = y;
	}

	public double getX ()  {
		return x;
	}
	
	public double getY ()  {
		return y;
	}
	
	/** Metodo distance */
	
	public double distance ( Punto p ) {
		return Math.sqrt ( ( x-p.x ) * (x-p.x) + (y-p.y) * (y-p.y) );
	}
	
	/** Metodo equals */

	public int hashCode() { return 0; }
	
	public boolean equals ( Object o ) {
		if ( o instanceof Punto ) {
			Punto p = (Punto) o;
			return ( p.x == x && p.y == y );
		}
		else 
			return false;
	}
	
	/** Metodo toString */
	
	public String toString() {
		return "(" + x + "," + y + ")";
	}

}