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Round Rects extends Graphics Activity Source Code for Andriod.

Java实现主曲线的生成过程，使用多项式线性算法。(Java implementation of the master curve generation process, using a linear polynomial algorithm.)

Java大学实用教程（第2版）书中例子的程序源代码(Java University Practical Course (2nd edition) book example source code)

Java语言连接访问STK卫星分析工具的源代码，可直接应用到工程中。(STK satellite connection to access the Java language source code analysis tools can be applied directly to the project.)

spingsecurity的demo，初学者可根据注释和代码进行学习(Spingsecurity demo, beginners can learn from comments and code)

实现一个简单的超级服务器，支持多协议通信，也支持多协议文件传输(Implement a simple super-server, multi-protocol communication, also supports multi-protocol file transfer)

java编写的简单网站，使用Session,Cookie和数据库(A simple website,using Session,Cookie and database.It uses the java code is written.)

用Java编写的leedcode 算法题(Java prepared by the leedcode algorithm，)

说明：  基于Java Web的后台管理系统， 数据库和源代码都有，是个学习的好资料，强烈推荐！ (Java Web-based back-office management systems, databases and source code, is a good learning materials, highly recommended!)

说明：  ipdatabase 二叉树快速搜索IP地址数据库 数据 数据源采用2015年广告协会制定的IP地址标准数据库，中国互联网广告行业统一采用的标准IP库。 原理 利用二叉树实现IP查询，首先将10进制IPV4地址转化为二进制构建二叉树，利用二叉树搜索进行搜索，查询时间复杂度log2n，比传统IP库n的查询速度高出一个量级。(Ipdatabase Binary Tree Fast Search IP Address Database data The data source is the standard IP address database formulated by the Advertising Association in 2015, and the standard IP database adopted by the Internet advertising industry in China. principle The binary tree is used to realize IP query. Firstly, the 10-bit IPV4 address is converted into binary to construct a binary tree, and the binary tree search is used to search. The query time complexity log2n is one order of magnitude higher than that of traditional IP library n.)