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Testing left-associativity of the + operator.

通过微博研究网络热点舆情事件的态势及演化规律10.13(Public opinion research hotspots events through the microblogging trend and evolution 10.13)

用Java实现的SaaS多租户软件，基于SpringBoot和JPA，独立数据库/共享数据库独立Schema的多租户系统。(SaaS multi-tenant software implemented in Java is a multi-tenant system based on SpringBook and JPA, independent database or shared database independent Schema.)

学习JAVA网络编程的英文书籍~~~~ 包含Core_Servlets_and_JavaServer_Pages(Learning JAVA Network Programming in English books ~ ~ ~ ~ include Core_Servlets_and_JavaServer_Pages)

说明：  控制条件语句的变量，在for循环结束后，就不可以被访问了，而while循环还可以访问，如果你继续想使用该变量，则可以使用while循环，否则推荐使用for循环，原因是for循环结束，该变量就从内存中消失，能够提高内存的使用效率。(The variable that controls the conditional statement is not accessible after the for loop has finished, and the while loop is accessible if you continue to use the variable, you can use the while loop. Otherwise, it is recommended to use the for loop, because the variable disappears from memory after the for loop, which can improve memory efficiency.)

jQuery学习教程，适合初学者观看，对刚开始了解jQuery的人是一本不错的教程(jQuery tutorial for beginners view of people who just begin to understand jQuery is a good tutorial)

GEF 使用、原理、功能、框架介绍，初学者必备书籍(GEF use, principles, functions, frameworks introduced)

说明：  第一个Java例子程序，源文件为HelloWorld.java，可以使用 javac HelloWorld.java 进行编译，然后运行， java HelloWorld(The first example of a Java program, the source file is HelloWorld.java, you can use the javac HelloWorld.java compile and run, java HelloWorld)

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特征线法设计二维风洞喷管,具体理论可参见气体动力学教材(design of two dimensional nozzle by characteristic method)