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这是一个java编写的用户登录系统，主要功能是检测用户是否合法(This is a java written user login system, the main function is to detect whether the user is legitimate)

说明：  以前做的android的FTP demo，功能没有完全实现，上传和下载的限速是虚拟的(The FTP demo of Android has not been fully implemented. The speed limit of upload and download is virtual)

android 源码 SystemUpdatePreferenceController.java

java开发的网上书店，可以链接数据库实现查询书目，查询库存量，添加购物车，删除已购图书的功能-java development of on-line bookstore, you can link to bibliographic database query, query inventory, add the shopping cart, delete function has been to buy books

TextView that draws a bubble behind the text.

局域网通信，可以实现局域网群聊的简单java程序-Local area network communications, LAN group can achieve a simple java chat program

办公自动化（OA）是面向组织的日常运作和管理，员工及管理者使用频率最高的应用系统，极大提高公司的办公效率。oasys是一个OA办公自动化系统，使用Maven进行项目管理，基于springboot框架开发的项目，mysql底层数据库，前端采用freemarker模板引擎，Bootstrap作为前端UI框架，集成了jpa、mybatis等框架

javabean由入门到精通，以实例进行讲解：javabean基础、javabean高级概念、jar剖析、开发环境-Throght introduction to mastery in javabean,explains by examples:javabean foudation,javabean advanced-concept,jar parse,develop environment

Java Modeling Tools,是基于排队论对系统模型进行仿真分析的有效工具，现已成为面向科研、教学与应用的开源软件(Java Modeling Tools, has now become an effective tool for the simulation analysis of the system model based on queuing theory, for research, teaching and application of open source software)

实例中如用到数据库，请到这里下载 https://www.haolizi.net/example/view_30457.html