Return type of iterator() method in java

Question

I am a new-comer in Java and in process of learning. I need a an answer of following question supported with valid theory. Consider the following line-

Iterat         


        

Answer 1

You can define the return type of your Iterator beforehand. As you declare the iterator, you can (and should) define the type of your list items like this:

Iterator itr = al.iterator();

So when you access itr you don't have to cast to file, e.g. (File) itr.next() but can directly use it in your while loop:

while (it.hasNext()) { File f = itr.next() }

Your compiler now won't complain when using next().