As Iterator is an interface with hasNext(), next() and remove() methods. But where is the implementation for all these methods in Java classes?
As Iterator is an interface with hasNext(), next() and remove() methods. But where is
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As Iterator is an interface with hasNext(), next() and remove() methods. But where is the implementation for all these methods in Java classes?
Almost every concrete collection has its own implementation, optimized for that specific collection. You don’t have to bother about the details. But here are some examples:
LinkedList–class ListItr implements ListIterator<E>ArrayList–class ListItr extends Itr implements ListIterator<E>HashSet– actually backed byHashMap.keySet()Becasue
Iteratoris an interface, you can do fancy things with it, like wrapping and decorating it, without paying attention to the actual implementation.