/**
 * Point represents an (x,y) coordinate pair
 * This class exists solely to show an example of overriding hashCode().
 * Remember, you only need to override hashCode() if you override equals().
 */
public class Point {
	private int x, y;
	
	@Override
	public int hashCode() {
		// We want two Points that are equal to return the same hash code.
		// Because two Points with the same (x,y) values are equal, we make
		// the hash code a function of x and y. Because every Java object has
		// the hashCode() method, our hash code can be a function of the hash
		// codes of the instance fields.
		return ((Integer)x).hashCode() * ((Integer)y).hashCode();
	}
	
	@Override
	public boolean equals(Object o) {
		if (o instanceof Point) {
			Point p = (Point) o;
			return x == p.x && y == p.y;
		}
		return false;
	}
}