答案

Tests regular expressions containing special characters.

实现扑克牌，一副牌中抽去大小王剩下52张（如果初练也可只用1～10这40张牌)，任意抽取4张牌（称牌组)，用加、减、乘、除（可加括号)把牌面上的数算成24。每张牌必须用一次且只能用一次，如抽出的牌是3、8、8、9，那么算式为（9-8)×8×3或3×8+（9-8)或（9- 8÷8)×3等。(In order to realize playing cards, 52 cards are removed from a deck (only 40 cards can be used for the first practice). Four cards are randomly selected (called card groups). The number on the deck is calculated as 24 by adding, subtracting, multiplying and dividing (brackets can be added). Each card must be used once and only once. If the drawn card is 3, 8, 8, 9, the formula is (9-8)*8*3 or 3*8+ (9-8) or (9-8 8)*3)

【实例简介】spring jpa入门级项目，实现了对数据库的 增、删、改、查、分页、导出、导入excel等基本操作 【调试步骤】 0.新建mysql数据库studentinfo，然后在该数据库执行数据库脚本 studentinfo.sql 1.修改application.yml文件中的数据库信息为您本机mysql用户名密码 2.运行项目后，打开浏览器http://localhost:8080  ,输入登陆账号密码均为：admin

完全仿照慕课网开发，前端的课程选择，课程分类等等，后台的课程管理，讲师的管理 ，对网站流量的统计，等等十分精美，基本不需要二次开发就可以满足视频学习类网站的需求(It is completely imitated by Mutu Net development, front-end course selection, course classification, etc., back-end course management, lecturer management, statistics on website traffic, etc. It is very beautiful, and basically can meet the video learning website without secondary development. Demand)

用java写的小工具，可以批量的从ieee下载论文，同时下载后的文件名就是论文的题目，不用手动改名。原理是分析出网页上论文的题目和uri，利用360浏览器的批量下载功能实现。(Small tool written in java, the bulk of the papers from ieee download at the same time after downloading the file name is the topic of the paper without having to manually change its name. The principle is to analyze the topic of the paper on the web and uri, 360 browser batch download feature implementation.)

说明：  自己实现的基于串口通讯发送短消息的低层协议JAVA代码，对于初学者有一定的参考和帮助价值，特意上传上来共享一下！(Their own realization of serial communication based on sending short messages JAVA code low-level agreement, for beginners there is a certain degree of reference and to help the value of deliberately upload up to share about!)

DirectByteBuffer extends BaseByteBuffer implements DirectBuffer.

itext2.07 转PDF、itext API 、java+用iText生成Word文件、中文帮助文档( itext2.07 turn PDF, itext API, java+ generated Word file using iText, Chinese help documentation)

教会使用java进行游戏设计，开发者了解游戏的基本设计技巧(church for the use of game design, game developers understand the basic design skills)

liferay portlet 实例，可以直接部署(liferay portlet instance, can be directly deployed)