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

Question

Consider the following scenario.

List<String> list = new ArrayList<>();

Now I added the String values for this list.

I used following ways to go each and every element in the list.

Option one- use for-each

for (String i : list) {
        System.out.println(i);
    } 

Option two- use Iterator

Iterator it=list.iterator();
while (it.hasNext()){
   System.out.println(it.next());
}

I just want to know is there any performance advantage if I use for-each instead of Iterator. And also is it a bad practice to use Iterator now a days in Java?

Answer 1

for-each is syntactic sugar for using iterators (approach 2).

You might need to use iterators if you need to modify collection in your loop. First approach will throw exception.

for (String i : list) {
    System.out.println(i);
    list.remove(i); // throws exception
} 

Iterator it=list.iterator();
while (it.hasNext()){
    System.out.println(it.next());
    it.remove(); // valid here
}