Tutorial: Access Your Stored Java Objects with the Iterator Design Pattern:

Access Your Stored Java Objects with the Iterator Design Pattern

This article, the eighth in a series about design patterns, introduces the Iterator design pattern, one of the 23 design patterns defined in the legendary 1995 book Design Patterns—Elements of Reusable Object-Oriented Software. The authors of the book, Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, are known as the Gang of Four (GoF). The GoF book defines 23 design patterns. The patterns fall into three categories:

A creational pattern abstracts the instantiation process.
A structural pattern groups objects into larger structures.
A behavioral pattern defines better communication among objects.

The Iterator design pattern fits into the behavioral category. According to the GoF book, the Iterator design pattern "provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation."

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