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Caculator is veri good which is helpful.eds

编写一个控制台程序，模拟在ATM机的存款和取款过程，当输入给定的卡号和密码（初始卡号和密码到数据文件里查看）时，系统能登录ATM系统，根据用户的身份不同显示不同的程序界面；取款 　　每次取款金额只能为100的倍数，总额不超过2000元，不允许透支。且取款之后，要记录取款的金额和时间。 存款 　　每次存款金额只能为100的倍数，总额不超过2000元。 修改密码 　　新密码长度不小于6位，不允许出现6位完全相同的情况，只有旧密码正确，新密码符合要求，且两次输入相同的情况下才可以成功修改密码。(Write a console program to simulate the ATM deposits and withdrawals process, when you enter a given number and password (the initial number and password to the data file view), the system can log in ATM systems, according to the user' s identity different display different The program interface withdrawal amount each withdrawal can only be a multiple of 100, the total does not exceed 2,000 yuan, does not allow overdrafts. And withdrawals after the withdrawal of the amount to be recorded and time. Deposit Amount per Deposit only a multiple of 100, totaling no more than 2,000 yuan. Change Password New Password length not less than six, allowed six identical situation, only the old password is correct, the new password meets the requirements, and enter the same case twice before they can successfully change the password.)

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.)

聊天 现代汉语辞典里对 聊天 的解释为：闲谈，即空闲时候说说话。 网络聊天是什么 咋看上去这是一个非常愚蠢的话题，但细细想来的确还有几分迷惑，上网近六年我总在思考这看似简单却又令人费解的问题，网络是什... (chatroom)

主要用于支持spatial indexing technology, 使用spatial index包括R-tree以及R-tree的扩展，可以进行包含坐标数据的index以及search(Used to support spatial indexing technology, including the use of spatial index R-tree and R-tree extension can contain coordinate data of the index and search)

自1996以来，JavaScript：权威指南已经programmers-a JavaScript程序员指南、核心语言综合参考和API定义的Web浏览器的客户端JavaScript圣经。第六版包括HTML5和ECMAScript 5，在jQuery和服务器端JavaScript的新篇章。这是推荐有经验的程序员谁想学习网络编程语言，和当前的JavaScript程序员要掌握它。(Since 1996, JavaScript: The Definitive Guide has been the bible for JavaScript programmers—a programmer’s guide and comprehensive reference to the core language and to the client-side JavaScript APIs defined by web browsers. The 6th edition covers HTML5 and ECMAScript 5, with new chapters on jQuery and server side JavaScript. It’s recommended for experienced programmers who want to learn the programming language of the Web, and for current JavaScript programmers who want to master it.)

一个用java编写的聊天室工具，使用了多线程，每次上线一个用户都会开辟一个线程(Write a java chat room tools, the use of multiple threads, each on-line user would open up a thread)

编程之道 ebook for programming(ebook for programming)

基于维基百科的实体链接程序.实现了从文字链接到维基百科词条的功能(a program based one the wiki .used for the entity link example.it can be used on the knowledge graph .)

文件内容丰富，包含 有j2se,jsp,ejb方面面试的经典问题。堪称JAVA程序员面试宝典~~~(File content-rich, contains j2se, jsp, ejb interview classic problem areas. Rated JAVA programmer interview Collection ~ ~ ~)