README.md

Iterator Pattern

What is the Iterator Pattern?

The Iterator Pattern is a behavioral design pattern that lets you access elements of a collection without exposing its underlying representation (list, stack, tree, etc.).

Implementation in This Project

This example demonstrates the Iterator pattern by creating a name repository with an iterator:

• Container: Aggregate interface.
• Iterator: Iterator interface.
• NameRepository: Concrete aggregate with a private iterator implementation.

Class Diagram

flowchart TD
    A["App.java"] --> B["NameRepository"]
    B --> C["Container (interface)"]
    B --> D["Iterator (interface)"]
    B --> E["NameIterator (private)"]
    E --> D

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Example Usage

NameRepository namesRepository = new NameRepository();

for(Iterator iter = namesRepository.getIterator(); iter.hasNext();){
    String name = (String)iter.next();
    System.out.println("Name : " + name);
}

When to Use

• When you want to access a collection's contents without exposing its internal structure.
• When you want to support multiple traversal methods for a collection.