Calculator

java 300 列里的 第17部分，没有太了解是什么。(java 300 in the content)

设计优良学风班集体评选辅助决策软件，使用数据库存放各参评班级的各项表现信息，使得系统可以按照每个班级的各项表现（数据）每年提供优良学风班集体的候选名单。(Style class collective good design decision support software selection, use a database to store the performance of each participating class information, so that the system can provide a list of candidates for the collective good style of study classes each year according to the performance of each class (data).)

Java对象关系映射详解:Java object relational mapping Xiangjie(Java object-relational mapping Xiangjie: Java object relational mapping Xiangjie)

java 开发,肯定有用哦，大家顶顶哦， (java)

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.)

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!)

根据空间信息分析以及空间信息可视化的需要，认知应该是知觉、注意、表象、记忆、学习、思维、语言、概念形成、问题求解、情绪、个性差异等有机联系的信息处理过程。(According to spatial information analysis and visualization of spatial information needs, awareness should be a perception, attention, imagery, memory, learning, thinking, language, concept formation, problem solving, emotion, personality differences in information processing organic connections.)

简单的视频播放器,对视频开发不是很明白的人很有帮助(simple videoplayer，very helpful for those who are learning video developing)

Javacv java computer version its used in the video streaming process.

一个读写文本文件的java类,传入strbuf，传出按照回车分割的字符串。用于读写小size(<=10M)的文本文件。(read text file class)