Sorting arraylist of objects based on the date time

Question

I have two arraylists that consist of the datetime objects and merging both the list using.

list1.addAll(list2);

I want to now sort this arraylist on the order of the date time object that the arraylist consists of. Can anyone guide me how to sort this arraylist.

Possible dupe of http://stackoverflow.com/questions/5927109/sort-objects-in-arraylist-by-date — Cephron, Feb 02 '12 at 07:51

Eugene · Answer 1 · 2018-08-31T11:38:25.097

5

ArrayList<Date> myDates = new ArrayList<>();
// populate the List... 
Collections.sort(myDates);

If you are using Joda Time Date time, this is done the same way, since those classes usually implement Comparable.

edited Aug 31 '18 at 11:38

answered Feb 02 '12 at 07:51

Eugene

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No need for a custom comparator. – JB Nizet Feb 02 '12 at 07:53
_Almost_ the same? What's the difference? – Charles Wood Jul 17 '13 at 19:16

score 5 · Accepted Answer · answered Feb 02 '12 at 07:51

5

If you meant they have Java Date object. You can just do Collections#sort()

answered Feb 02 '12 at 07:51

Nishant

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score 0 · Answer 3 · answered Feb 02 '12 at 07:52

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You can define your comparator for the objects of the arraylist, like if I am using objects having structure

and then you can use, sort method directly.

answered Feb 02 '12 at 07:52

jeet

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Sorting arraylist of objects based on the date time

3 Answers3

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