客户管理系统项目，项目虽然比较小，但是基本功能都已实现，适合Java基础新手学习，代码注释非常多。对各种比较难懂的地方都进行了注释。自己学Java的总结。-Customer management system project, although the project is relatively small, but the basic functions have been achieved, suitable for novice learning Java-based, code comm