test

说明：  The C Programming Language若干行代码网络平台输出测试(A "Hello, World!"program generally is a computer program that outputs or displays the message "Hello, World!". Such a program is very simple in most programming languages, and is often used to illustrate the basic syntax of a programming language. It is often the first program written by people learning to code.)

该代码是在原有的程序基础上，，进行对计算器的修改。。(The code is based on the original program, to carry out modifications to the calculator. .)

Testing left-associativity of the + operator.

一个javaGUI计算器，可以计算多项式(A java GUI calculator that can solving polynomials)

link Priority Thread Factory Source Code for Andriod.

Java照片合成程序示例，只是进行简单的图片合成处理，合并后生成新的图片，有兴趣的可参考源代码(Java photo synthesis program example, just a simple image synthesis process, after the merger to generate a new image, interested can refer to the source code)

java小例程3。多个小例程，供初学者学习参考(java three small routines. Many small routines for beginners learning reference. .)

说明：  网络版JAVA版飞机大战，自己在学习JAVA网络开发时写的小栗子(Network version JAVA version of the aircraft war,Xiao Chestnut Written by myself in Learning JAVA Network Development)

说明：  1. 能够实现根据以下关键字查询：学生姓名 、学号、班级、课程名称。 2. 能够实现按照单科成绩、总成绩、平均成绩、学号排序。 3. 能够实现学生信息的插入、删除和修改。 4. 能够查询每个课程的最高分、最低分及相应学生姓名、班级和学号。 5. 能够查询每个班级某门课程的优秀率(90 分及以上)、不及格率，并进行排序。(1. Be able to query according to the following keywords: student name, student number, class, course name. 2. It can be sorted according to single subject score, total score, average score and student number. 3. Be able to insert, delete and modify student information. 4. Be able to query the highest score and lowest score of each course and the corresponding student name, class and student number. 5. Be able to query the excellent rate (90 points and above) and failure rate of a course in each class, and sort them.)

java设计模式中观察者模式的简单实现，可以让读者清晰明白观察者模式的原理。(a java design pattern can let you know what is observe design pattern)