Trying to sort an ArrayList of Objects by last name, then by first name if last names are the same

Question

I created an ArrayList from an array.

ArrayList <Person> PersonArrayList = new ArrayList<>(Arrays.asList(PersonArray));

What is the best way to go about doing this?

Trying something like:

I have created getters getLastName() and getFirstName()

Ousmane D. · Accepted Answer · 2018-12-04 23:54:27Z

3

The easiest way would be using comparing along with thenComparing.

personArrayList.sort(Comparator.comparing(Person::getLastName)
                               .thenComparing(Person::getFirstName));

answered Dec 4, 2018 at 23:54

Ousmane D.

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2 Comments

Themelis Over a year ago

What does’Person::getLastName’ mean?

Ousmane D. Over a year ago

@Skemelio it's a method reference which is equivalent to the following lambda (Person person) -> person.getLastName(). Essentially, the Comparator Comparator.comparing(Person::getLastName) .thenComparing(Person::getFirstName) first extracts the persons' last names for comparison and if they're the same extracts the persons' first names and compares them.

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