Question

Please tell me the difference between for loop and iterate? when should i use for/iterate?

ex:-

for(int i=0;i<arrayList.size();i++)
{
System.out.println(arrayList.get(i));
}


// using iterator
Iterator animalItr = animalList.iterator();

    while(animalItr.hasNext()) {
      String animalObj = (String)animalItr.next();
      System.out.println(animalObj);
}

Answer 1

Using an Iterator to iterate through a Collection is the safest and fastest way to traverse through a Collection.

For the collections like ArrayList here, which are array-backed, it might not make a difference.

One of the best reasons for using an Iterator is that you can safely modify the collection without raising a ConcurrentModificationException.