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// Simple immutable two-dimensional integer point class - Page 37

import java.util.*;

public class Point {

private final int x;

private final int y;

public Point(int x, int y) {

this.x = x;

this.y = y;

}

@Override public boolean equals(Object o) {

if (!(o instanceof Point))

return false;

Point p = (Point)o;

return p.x == x && p.y == y;

}

// Broken - violates Liskov substitution principle - Pages 39-40

// @Override public boolean equals(Object o) {

// if (o == null || o.getClass() != getClass())

// return false;

// Point p = (Point) o;

// return p.x == x && p.y == y;

// }

// See Item 9

@Override public int hashCode() {

return 31 * x + y;

}

}