How compare only items in 2 lists?

Question

Android 5.0, Java 1.7

I has 2 lists. I need to compare only content of this lists. The order of the elements does not matter. Example:

[1,2,3,4,5] , [1,2,3,4,5] -> return true

[1,2,3,4] , [1,2,3,4,5] -> return false

[1,3,5,4,2] , [1,2,3,4,5] -> return true

by writing the code that does that, but we're not a handing out code service. — Stultuske, Nov 22 '18 at 11:03
You an try converting list to SET and then compare them by Collection comparator — ahuja007, Nov 22 '18 at 11:05
duplicate https://stackoverflow.com/questions/13501142/java-arraylist-how-can-i-tell-if-two-lists-are-equal-order-not-mattering — Aiko West, Nov 22 '18 at 11:06
Possible duplicate of [Java ArrayList - how can I tell if two lists are equal, order not mattering?](https://stackoverflow.com/questions/13501142/java-arraylist-how-can-i-tell-if-two-lists-are-equal-order-not-mattering) — Andrii Omelchenko, Nov 22 '18 at 11:07

Schidu Luca · Accepted Answer · 2018-11-22T11:18:26.810

2

A simple method would be to use containsAll method:

if(listOne.containsAll(listTwo) && listTwo.containsAll(listOne)) {
    System.out.println("They are equal");
}

edited Nov 22 '18 at 11:18

answered Nov 22 '18 at 11:12

Schidu Luca

1

If size of lists are same then one comparison is in-off to full-fill check. – Chetan Joshi Nov 22 '18 at 11:14
That's not necessarily true – Schidu Luca Nov 22 '18 at 11:21

1 Answers1