public class PointMain {
    public static void main(String[] args) {
        // create two Point objects
        Point p1 = new Point();
        p1.x = 7;
        p1.y = 2;
        Point p2 = new Point();
        p2.x = 4;
        p2.y = 3;
        
        System.out.println("p1 is (" + p1.x + ", " + p1.y + ")");
        System.out.println("p1's distance from origin = " + p1.distanceFromOrigin());

        System.out.println("p2 is (" + p2.x + ", " + p2.y + ")"); 
        System.out.println("p2's distance from origin = " + p2.distanceFromOrigin());
        
        // translate(p1, 11, 6);    // static method version
        p1.translate(11, 6);  // "instance method" version
        p2.translate(1, 7);
        
        double d = p1.distance(p2);
        System.out.println("p1's distance from p2 = " + d);

        System.out.println("p1 is (" + p1.x + ", " + p1.y + ")");
        System.out.println("p2 is (" + p2.x + ", " + p2.y + ")"); 
    }
    
    /*
    We don't need these methods any more; they're replaced
    by methods in the Point class.
    
    public static double distanceFromOrigin(Point p) {
        return Math.sqrt(p.x * p.x + p.y * p.y);
    }
    
    public static void translate(Point p, int dx, int dy) {
        p.x += dx;
        p.y += dy;
    }
    */
}