Implementing compareTo() using commons-lang

Here CompareToBuilder is used to implement compareTo();

public int compareTo(Person person) {
    return new CompareToBuilder()
    append(this.firstName, person.firstName)
    append(this.lastName, person.firstName)
    toComparison();
}

Also, there is yet another reflection option:

public int compareTo(Object o) {
    return CompareToBuilder.reflectionCompare(this, o);
}