Shulou(Shulou.com)06/02 Report--

This article introduces the knowledge of "what is the iterator pattern in java". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Definition of pattern

How can you access different aggregation objects internally in a unified way?

Definition of iterator pattern:

Provides a method to sequentially access elements in an aggregated object without exposing the internal representation of the object

An aggregate object is a composite structure of a group of objects, such as collections and arrays in Java.

2. UML diagram

Iterator: an iterator interface that defines the interface for accessing and traversing elements

ConcreteIterator: the concrete iterator object. Implement traversal of the aggregate object and track the current location of the traversal

Aggregate: aggregate objects, defining the interface that creates the corresponding iterator object

ConcreteAggregate: concrete aggregate objects to create corresponding iterator objects

Code:

3. Grinding design mode

1) the key idea of the iterator pattern is to separate the traversal and access to the aggregate object from the aggregate object and put it into a separate iterator.

2) iterator in Java: java.util.Iterator

3) iterator with iterative strategy

4) Bidirectional iterator: java.util.ListIterator

5) the essence of iterators is to control access to elements in aggregate objects.

6) turn pages and iterate:

That's all for "what is the iterator pattern in java?" Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.