Does an instance of an Iterator opened on a collection keep the whole collection in memory and access a position that increments every time next() is called? Or am I missing something?
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Does an instance of an Iterator opened on a collection keep the whole collection in memory and access a position that increments every time next() is called? Or am I missing something?
The implementation of
Iteratordepends on the particularCollectionit is iterating. If you look at the JDK source code,ArrayListandLinkedListfor example use different iterators.Remember
Iteratoris an interface not a concrete class so it simply specifies a contract not an implementation.Generally speaking iterators will (depending on the implementation) store a reference to the collection and some kind of index to mark where they’re up to.