java - Best way to sort 2 array lists?

Question

I have 2 array lists. One is an array list containing birthdays. The other is an array list of names.

I am sorting the array list of dates in descending order by date using

Collections.sort(birthdayList);

I want to have the array list of names be sorted in the same order that the birthday list was.

i.e.

unsorted

bdaylist   namelist

1/20/1980 - Bob

3/15/1970 - Todd

8/25/1990 - Jeff

becomes

sorted

3/15/1970 - Todd

1/20/1980 - Bob

8/25/1990 - Jeff

What would be the most efficient way to do this in Java?

Thank you very much!

Answer 1

• Create a Person class with 2 fields: name and birthday.
• Put the persons in a list
• sort with a custom comparator that compares the birthdays