public class Country {
    int population;
    double area;
    String name;


    @Override
    public int hashCode() {
        return 0;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Country other = (Country) obj;
        if (Double.doubleToLongBits(area) != Double
                .doubleToLongBits(other.area))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (population != other.population)
            return false;
        return true;
    }
}