public class Point {
   int x;
   int y;
   public Point(int x0, int y0) {
       x = x0;
       y = y0;
   }
    @Override
   public String toString() {
       return "(" + x + "/" + y + ")";
   }
   public double distance(Point p) {
       int x = this.x;
       int y = this.y;
       int a;
       int b;
       double abs;

       a = x - p.x;
       if (a < 0) {
           a = -1 * a;
       }

       b = y - p.y;
       if (b < 0) {
           b = -1 * b;
       }

       abs = Math.pow((a*a + b*b), 0.5);

       return abs;
   }
    public static void main(String[] args) {
        Point p1 = new Point(1, 1);
        Point p2 = new Point(4, 4);

        System.out.println("Abstand: " + p1.distance(p2));
   }
}