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.

@naveen -- it's tagged with java

Cephron
– Cephron

2012-02-02 07:47:04 +00:00
Commented Feb 2, 2012 at 7:47 — Cephron
– Cephron, Commented Feb 2, 2012 at 7:47
Collections.sort(list1); should do the trick for you.

Boris Strandjev
– Boris Strandjev

2012-02-02 07:49:52 +00:00
Commented Feb 2, 2012 at 7:49 — Boris Strandjev
– Boris Strandjev, Commented Feb 2, 2012 at 7:49
Possible dupe of stackoverflow.com/questions/5927109/…

Cephron
– Cephron

2012-02-02 07:51:00 +00:00
Commented Feb 2, 2012 at 7:51 — Cephron
– Cephron, Commented Feb 2, 2012 at 7:51

Nishant · Accepted Answer · 2012-02-02 07:51:53Z

5

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

answered Feb 2, 2012 at 7:51

Nishant

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Eugene · Accepted Answer · 2018-08-31 11:38:25Z

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, 2018 at 11:38

answered Feb 2, 2012 at 7:51

Eugene

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2 Comments

JB Nizet Over a year ago

No need for a custom comparator.

Charles Wood Over a year ago

Almost the same? What's the difference?

jeet · Accepted Answer · 2012-02-02 07:52:06Z

0

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 2, 2012 at 7:52

jeet

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