Java Foundation-iterators (Iterator) with enhanced for loop

Java Foundation-iterators (Iterator) with enhanced for loop

Yun Zhengjie

Copyright Notice: Original works, declined reprint! Otherwise, the legal liability will be investigated.

I. Iterator iterators overview

There are a number of collections in Java that are stored differently when storing elements. We need to take out the elements in these collections, which can be done in a common way.

Collection The general acquisition of the elements of the collection: before taking the element to determine whether there are any elements in the set, if any, take this element out, continue to judge, if there is to take out. All the elements in the collection have been taken out all the time. This method of extraction is known as an iterative term. In other words, the iteration is a way to take out the elements in the collection because there are iterator methods in collection, so each of the sub-class collection objects is an iterator object.

Two. How iterators are implemented

Java Foundation-iterators (Iterator) with enhanced for loop