For-each vs Iterator. Which will be the better option

Question

Consider the following scenario.

List list = new ArrayList<>();

Now I added the String values for this li

Answer 1

If you want to replace items in your List, I would go old school with a for loop

for (int nIndex=0; nIndex < list.size(); nIndex++) {
  Obj obj = (Obj) list.get(nIndex);

  // update list item
  list.set(nIndex, obj2);
}