נתונות שתי המחלקות Car, Motorcycle. למחלקות יש תכונה אחת – מהירות מרבית.

public class Car {
    private int speed;
    public Car (int s) { speed = s; }
    public int getSpeed () { return speed; }
    public boolean equals(Car other) {
        return (other!=null) && (speed == other.speed);
    }
}
public class Motorcycle {
    private int speed;
    public Motorcycle (int s) { speed = s; }
    public int getSpeed () { return speed; }
    public boolean equals (Object other) {
        return ((other != null) &&
                (other instanceof Motorcycle) &&
                (speed == ((Motorcycle)other).speed));
    }
}