本书设计实例从面向对象的设计中精选出23个设计模式，总结了面向对象设计中最有价值的经验，并且用简洁可复用的形式表达出来。本书分类描述了一组设计良好，表达清楚的软件设计模式，这些模式在实用环境下有特别有用。-Book design example of object-oriented design from a selection of 23 design patterns, object-oriented design sums up the most valuable experience and with a simple reusable expressed in the form. This book describes a set of categories designed to express a clear software design patterns, these patterns are particularly useful in practical circumstances.