public class JavaApplication {
    static class Point{
        private int x;
        private int y;

        Point(int x, int y){
            this.x = x;
            this.y = y;
        }

        public void setX(int x){ this.x = x;}
        public void setY(int y){ this.y = y;}
        public int getX(){ return this.x;}
        public int getY(){ return this.y;}
    }

    static class Shape{
        Point point;

        Shape(Point point){
             this.point = point;
        }

        public void move(int x, int y){
            point.setX(x);
            point.setY(y);
        }

        @Override
        public int hashCode() {
            int hash = 57;
            hash = hash * 17 + point.x;
            hash = hash * 17 + point.y;
            return hash;
        }

        @Override
        public boolean equals(Object obj) {
            Shape c = (Shape) obj;
            return (this.point.getX() == c.point.getX() && this.point.getY() == c.point.getY());
        }
    }
    public static void main(String[] args) {
        Set hs = new HashSet();
        Shape c1 = new Shape(new Point(1,1));
        hs.add(c1);
        c1.move(2, 2);
        System.out.println(hs.contains(c1));
        Shape c2 = new Shape(new Point(3,3));
        System.out.println(hs.contains(c2));
        hs.add(c2);
        Shape c3 = new Shape(new Point(3,3));
        System.out.println(hs.contains(c3));
    }
}