Java ArrayList Choose N elements

Question

Say I have an ArrayList containing the elements {1,2,3,4}, and I want to enumerate all possible combinations of two elements in the ArrayList. i.e. (1,2), (1,3), (1,4), (2,3), (2,4), (3,4). What is the most elegant way of going about doing this?

Mark Byers · Accepted Answer · 2011-10-07 05:10:07Z

6

Nested for loops would work:

for (int i = 0; i < arrayList.size(); ++i) {
    for (int j = i + 1; j < arrayList.size(); ++j) {
        // Use arrayList.get(i) and arrayList.get(j).
    }
}

edited Oct 7, 2011 at 5:10

answered Oct 7, 2011 at 4:52

Mark Byers

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1 Comment

Kakashi Over a year ago

I think that in second loop you can increment ++j instead of ++i

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