How to compare objects by multiple fields

Question

Assume you have some objects which have several fields they can be compared by:

public class Person {

    private String firstName;
    private String lastN         


        

Answer 1

Starting from Steve's answer the ternary operator can be used:

public int compareTo(Person other) {
    int f = firstName.compareTo(other.firstName);
    int l = lastName.compareTo(other.lastName);
    return f != 0 ? f : l != 0 ? l : Integer.compare(age, other.age);
}