Introduction - If you have any usage issues, please Google them yourself
Design Patterns:Elements of Reusable Object-Oriented software: This book design example of object-oriented design from a selection of out of 23 design patterns, object-oriented design summary of the most valuable experience and with the simple reusable in the form of expression. This book describes a set of categories designed to express a clear software design patterns, these patterns in practical circumstances are particularly useful.