Iterator in Java

Question

What is Iterator and collections? Does these two have any relations?

// the interface definition
Interface Iterator {
    boolean hasNext();
    Object next();          


        

Answer 1

Technically iterators and collections are not directly related. However Iterators are mostly used together with collections to interate over the objects contained in the collection.

Iterators are a general and flexible concept that allows to interate objects without depending on the exact implementation of the entity that they iterate over.