How to find the difference between two arraylist values in java?

Question

static ArrayList random_ints=new ArrayList();
static ArrayList mean_storage=new ArrayList();
static ArrayList diff_means=new ArrayList();


random_ints = {834,438,234,124};
mean_storage = {867,459,254,189};

I have to find out the difference b/w these 2 array lists and store in "diff_means" array list

@ArnaudDenoyelle I think the difference he is asking for is 834-867 or vice-versa !! — Neeraj Jain
– Neeraj Jain, Commented Mar 18, 2015 at 11:04

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

if your requirement is absolute difference between the list's element values then

Try This

int length=firstList.size();
for(int i=0;i<length;i++){
   resultList.add(Math.abs(firstList.get(i)-secondList.get(i)));
}

Assuming Size of Both the list is same !

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Mar 18, 2015 at 11:14

Neeraj Jain

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1 Comment

Arnaud Denoyelle Over a year ago

You mean resultList.add?

Amit K · Accepted Answer · 2015-03-18 11:22:37Z

0

So unless you are looking for a specifically optimized solution, you can iterate the lists, get the numbers from both input lists at a particular index and find the difference (believing that mere subtraction would do, judging which number is greater!) and add it to third list. You may need to handle situation where size of one list is less than other.

answered Mar 18, 2015 at 11:22

Amit K

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