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java实验代码编写一个圆类，定义圆心与半径等属性并被其他类继承(Java experimental code to write a class circle)

该代码是在原有的程序基础上，，进行对计算器的修改。。(The code is based on the original program, to carry out modifications to the calculator. .)

将各种格式的数据转换为json格式的字符串 ajax交互数据时使用(When converting various formats of data into JSON format string Ajax interactive data)

基于serverSocket 和socket编写的及时聊天系统。有类似于tencent的qq界面，能实时监听用户的上下线。能发离线消息。有用户连接池。以及账号注册，修改等功能(ServerSocket and socket-based chat system written in a timely manner. Tencent similar to those of the qq interface, real-time monitor on the user' s offline. Offline messages can be issued. A user connection pool. As well as account registration, modification and other functions)

Hibernate运行Demo，详细讲解启动配置文件Hibernate.cfg如何编写，包括SessionFactory里的数据源如何配置(Hibernate Run Demo, explain in detail how the startup configuration file Hibernate.cfg preparation, including SessionFactory in how to configure data sources)

说明：  jQuery.validate.js文件(jQuery.validate.js file)

这是关于java中字符串的相关代码源文件，大家可以试着下载下来学习或查阅(This is about the relevant code string java source files, you can try to download or access to learning)

说明：  专门为kettle这款优秀的ETL工具开发的web端管理工具。 kettle作为非常优秀的开源ETL工具得到了非常广泛的使用，一般的使用的都是使用客户端操作管理，但问题是当投入生产环境使用时，动辄上百或几百个job需要管理，这时在使用客户端管理已经很难完成了。我所知道的解决方案有用命令行的调用的，操作麻烦，总之还是很难用啦，还有就是开发web端管理工具，kettle自带了一个web端管理工具，界面极其简陋不说，还很难用，基本无法投入生产环境使用，其他没留意到还有没有较好对众多job进行管理的工具。(A web-side management tool specially developed for kettle, an excellent ETL tool. Kettle as a very excellent open source ETL tool has been widely used, the general use is the use of client operation management, but the problem is that when used in production environment, hundreds or hundreds of jobs need to be managed, when the use of client management has been very difficult to complete. The solution I know has command-line calls, troublesome operation, in short, it is difficult to use, but also the development of web-side management tools, kettle has a web-side management tool, the interface is extremely simple, not to mention, it is also difficult to use, basically can not be put into production environment, other did not notice there is no better. Tools for managing many jobs.)

说明：  实现基于redis的bloomFilter(the implements of bloomfilter based on redis)

用Java实现的SaaS多租户软件，基于SpringBoot和JPA，独立数据库/共享数据库独立Schema的多租户系统。(SaaS multi-tenant software implemented in Java is a multi-tenant system based on SpringBook and JPA, independent database or shared database independent Schema.)