JAVA_WELCOME

(4)结果映射：将操作数据库的结果按照映射的配置进行转换，可以转换成HashMap、JavaBean或者基本数据类型，并将最终结果返回(result mapping: transform the result of the operation database according to the configuration of the mapping, which can be converted into HashMap, JavaBean or basic data type, and return the final result)

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.)

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)

说明：  签到，小程序，微信，签到，企业签到，学校签到，考勤签到(Check-in, applet, Wechat, Check-in, Enterprise Check-in, School Check-in, Attendance Check-in)

通过WiFi传输（UDP传输格式）进行相应底层硬件的控制，实现了无线的控制电力的详细使用情况。(Corresponding underlying hardware control WiFi transport (UDP transport format) by achieving a detailed control of the power usage of the radio.)

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

j2me Lrc_解析代碼.rar 一个demo，希望对大家有帮助(j2me Lrc_ parsing code. rar a demo, want to help everyone)

一个简单的学生信息记录表，用到了子类和父类的构造与派生(A simple student information records, use the subclass structure and derivation)

说明：  实现添加日志功能，用户能够保存自己怕忘记的事(Implementing the function of adding logs, users can save things they are afraid of forgetting.)

good codes for JavaWeb study. include JSP JavaScript CSS. the 21.zip is a project about ninegrid web,really beautiful and easy study for beginner.