基于文件的简易记账程序,编写一个Java项目，实现一个简易的机遇文件的记账程序，主要功能有两部分：一为记录消费的相关信息，二为按照消费条目名称查询相关消费信息。-Based on a simple accounting program file, write a Java program to achieve a simple bookkeeping program files opportunities, the main function has two parts: one for the

license机制对java产品进行控制，原理本地license文件记录安装时间，加载时读取license文件。- License mechanism to control the Java products, the principle of local license file record the installation time, load time read license file.