Compare every item to every other item in ArrayList

Question

I\'m having trouble with what I thought should be a pretty simple problem.

I need to compare every item in an arrayList with every other item in the the list without com

Answer 1

What's the problem with using for loop inside, just like outside?

for (int j = i + 1; j < list.size(); ++j) {
    ...
}

In general, since Java 5, I used iterators only once or twice.