Java For Loop - There are three ways for iterating list elements using For loop. Which one is recommended?

Question

In Java, I can iterate the list elements using below three ways using for loop.

1.

for (int i = 0; i < list.size(); i++) {
Person p = list.get(i);
...
}

2.
for(Person p : list) {
...
}

3.

for (Iterator<Person> it: list.iterator(); it.hasNext(); )
{
Person p = it.next();
...
}

Which is the most efficient / recommend?

Answer 1

depends, for granular access an iterator Is best but if you intend to use all items in your list them a for each statement is best, the first approach is commonly used for random access

Answer 2

in this case for lists I would use

for(Person p: list)

it guarantees including all elements and is easier to understand.

i don't know in terms of efficiency