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Capturing a wealth of experience about the design of object-oriented software, four top-notch designers present a catalog of simple and succinct solutions to commonly occurring design problems. Previously undocumented, these 23 patterns allow designers to create more flexible, elegant, and ultimately reusable designs without having to rediscover the design solutions themselves.

The authors begin by describing what patterns are and how they can help you design object-oriented software. They then go on to systematically name, explain, evaluate, and catalog recurring designs in object-oriented systems. With Design Patterns: Elements of Reusable Object-Oriented Software as your guide, you will learn how these important patterns fit into the software development process, and how you can leverage them to solve your own design problems most efficiently.

Each pattern describes the circumstances in which it is applicable, when it can be applied in view of other design constraints, and the consequences and trade-offs of using the pattern within a larger design. All patterns are compiled from real systems and are based on real-world examples. Each pattern also includes code that demonstrates how it may be implemented in object-oriented programming languages like C++ or Smalltalk.

Foreword

I Guide to Readers

1 Introduction

2 A Case Study: Designing a Document Editor

II Design Pattern Catalog

3 Creational Patterns

4 Structural Patterns

5 Behavioral Patterns

6 Conclusion

Appendix A: Glossary

Appendix B: Guide to Notation

Appendix C: Foundation Classes

Bibliography

Index

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将系统分解成对象集合。因为要考虑许多因素：封装、粒度、依赖关系、灵活性、性能、演化、复用等等，它们都影响着系统的分解，并且这些因素通常还是互相冲突的。

类型(type) 是用来标识特定接口的一个名字。

动态绑定是指发送的请求直到运行时刻才受你的具体的实现的约束。

进一步讲，动态绑定允许你在运行时刻彼此替换有相同接口的对象。这种可替换性就称为多态(polymorphism)，它是面向对象系统中的核心概念之一。

抽象类(abstract class)（与之对应的还有非抽象类称为具体类(concrete class)。）的主要目的是为它的子类定义公共接口。一个抽象类将把它的部分或全部操作的实现延迟到子类中，因此，一个抽象类不能被实例化。

子类能够改进和重新定义它们父类的操作。更具体地说，类能够重定义(override)父类定义的操作，重定义使得子类能接管父类对请求的处理操作。

书籍介绍

本书内容全面，讲解鞭辟入里，独具特色，读者必将在计算机科学的宫殿中的由登堂而入室。