package class9_1_HashSet_inClass_start;

public class Rock {
    private int x;
    private int y;

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

    @Override
    public boolean equals(Object obj) {
        Rock other = (Rock)obj;
        return other.x == this.x
                && other.y == this.y;
    }

    @Override
    public int hashCode() {
        double d = 5;
        String s = "Bob";
        return x+127*y
                +Double.hashCode(d)
                +s.hashCode();
    }
}