Point.java

class Point {
    private int x;
    private int y;

    public Point(int x, int y) {
      setX(x);
      setY(y);
    }

    public int getX() {
      return x;
    }

    public void setX(int x) {
      this.x = x;
    }

    public int getY() {
      return y;
    }

    public void setY(int y) {
      this.y = y;
    }

    @Override
    public boolean equals(Object other) {
      if (other instanceof Point) {
        Point otherPoint = (Point) other;
        return otherPoint.getX() == getX() &&
            otherPoint.getY() == getY();
      } else {
        return false;
      }
    }

    @Override
    public int hashCode() {
      return (new Integer[] {getX(), getY()}).hashCode();
    }
}