Calculator

一个简单的DAO设计模式的例子。 DAO(Data Access Object,数据访问对象) 的主要功能是数据操作，在程序的标准开发架构中属于数据层的操作。(A simple example of DAO design patterns. DAO (Data Access Object, data access object) is the main function of data manipulation, the standard development process in the program belongs to the operation of the data layer.)

黑灰化肥灰会挥发发灰黑讳为黑灰花会飞；灰黑化肥会会挥发发黑灰为讳飞花化为灰(Black grey chemical fertilizer ash will volatilize grey black taboo black grey flower will fly; grey black chemical fertilizer will volatilize black ash taboo fly ash)

工程务实系列：如何自动化建设部署和监控Java应用程序(Pragmatic Project Automation How to Build Deploy and Monitor Java Applications )

java用GZIP压缩解压文件的代码例子(GZIP compression decompression code example file Java)

说明：  遇到跨域问题把此java文件加进config类里(Add this java file to the Config class when encountering cross-domain problems)

说明：  一只青蛙一次可以跳上1级台阶，也可以跳上2级。求该青蛙跳上一个n级的台阶总共有多少种跳法。要求：分别用普通方法和递归方法实现(A frog can jump up a step or two at a time. Find out how many jumping methods the frog can use to jump up an n-step. Requirements: Implemented by common method and recursive method respectively)

记账：记录收入支出情况，随时可查看账单明细(Bookkeeping: recording income and expenditure, the details of the bill can be viewed at any time)

java调用surfer，生成等值面！！！！(polygon java surfer!!!)

自己动手写的简单记事本，能完成大部分window平台自带记事本功能(Write their own simple Notepad, to complete most of the window platform comes with Notepad function)

JSTL是一个不断完善的开放源代码的JSP标签库，是由apache的jakarta小组来维护的。JSTL只能运行在支持JSP1.2和Servlet2.3规范的容器上，如tomcat 4.x。但是在即将推出的JSP 2.0中是作为标准支持的。(JSTL is a continuous improvement of the open-source JSP tag library, are from the jakarta group apache to maintain. JSTL can only run in support of JSP1.2 and norms Servlet2.3 containers, such as tomcat 4.x. However, in the upcoming JSP 2.0 is supported as a standard.)