this is a trade sale system realized by java. It can run some easy functions and has a good design pattern CVS. A good project to learn CVS.

这是一个图书管理系统源代码，它应用了许多良好的设计模式，单态模式，工厂模式，享元模式，comand模式，observer模式，mvc体系结构，是学习设计模式的不错选择-This is a library management system source code, which is used by the many excellent design pattern, single-state mode the factory model, enjoy yuan model comand mode

用java编写的在线考试系统,采用mvc设计模式设计,系统能自动阅卷,上传考题很容易-With the online examination system written in java using mvc design pattern design, grading system can automatically upload exam easily