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编写一个复数类，可以进行复数加法和减法运算。编写一个包含main方法的类（应用程序）测试该复数类。要求该复数类至少包含一个无参的构造方法和一个带参的构造方法；数据成员包括复数的实部和虚部，为double类型；包括两个方法，分别实现复数的加法和减法运算。(Write a complex class, which can add and subtract complex numbers. Write a class (application) containing the main method to test the complex class. The complex class is required to include at least one parametric construction method and one parametric construction method; the data members include the real and imaginary parts of the complex, which are of double type; and two methods are included to realize the addition and subtraction operations of the complex respectively.)

利用java编写的贪吃蛇源代码，可利用其作为本科毕业设计(Snake prepared using java source code, can be used as a graduate design)

说明：  全书分四个部分：基础知识、函数式数据处理、高效Java 8 编程和超越Java 8。(The book is divided into four parts: basic knowledge, functional data processing, efficient Java 8 programming and beyond Java 8.)

基于java的一个Socket发送消息实现源代码，供大家参考(A Socket-based java source code to send a message, for your reference)

java 学习资料，《java网络编程》第三版的源代码，对于学习java的同学很有帮助哦(java learning materials, " java network programming," third edition of the source code, very helpful for the students to learn java Oh)

基于Ecplise开发的安卓Fragment页面，在真机上成功运行，可下载参考(The Android Fragment page based on Ecplise runs successfully on the real machine and can be downloaded for reference.)

主要掌握什么是变量，变量的基本类型，变量名的命名规则，以及算术运算符(Main master what is variable, the basic types, variable variable naming rules, and the name of the arithmetic operators )

小型户籍管理系统，可以实现基本的增删改查功能(Small household registration management system)

smtpMail.zip

qudong mysql-connector-java-3.2 the best the new (mysql-connector-java-3.2 the best the new )