Is there a performance difference between a for loop and a for-each loop?

Question

What, if any, is the performance difference between the following two loops?

for (Object o: objectArrayList) {
    o.DoSomething();
}

and <

Answer 1

By the variable name objectArrayList, I assume that is an instance of java.util.ArrayList. In that case, the performance difference would be unnoticeable.

On the other hand, if it's an instance of java.util.LinkedList, the second approach will be much slower as the List#get(int) is an O(n) operation.

So the first approach is always preferred unless the index is needed by the logic in the loop.