Improving performance with a array of million records

Question

I do have a array with million String objects..

ex:String values [] = new String[10000000]

and I've to reverse all the elements and what is the best way of doing it to improve performance?

You can only improve performance if you have something to measure it against. Please post your current code. — Andy Turner
– Andy Turner, Commented Sep 23, 2015 at 22:40
Code a really bad way to do it. Then make it better ... and way you will have improved performance :-) — Stephen C
– Stephen C, Commented Sep 23, 2015 at 22:44
The obvious solution where swap elements starting from the ends and moving to the middle should be optimal, I think. No, I ain't gunna code it for you! — Stephen C
– Stephen C, Commented Sep 23, 2015 at 22:46

bhspencer · Accepted Answer · 2015-09-23 23:14:04Z

1

You are making you task harder than it needs to be by not using the Collections standard library. Instead of an array use a List then use the standard Collections.reverse() method.

List<String> list = Arrays.asList(values);
Collections.reverse(list);

answered Sep 23, 2015 at 23:14

bhspencer

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