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ftp上传下载工具包以及常用的java工具类，实现了ftp的上传和下载(this is java ftp upload and download packet)

说明：  MIDP实现的 俄罗斯方块游戏源码，含游戏画布和封装下坠物对象及其操作类，重画线程,该线程实现游戏画布重画机制，用2个变量是用来控制游戏速度(The source code of the Tetris game implemented by MIDP, including the game canvas and the encapsulated falling object and its operation class, redraw thread, the thread implements the game canvas redraw mechanism, and uses 2 variables to control the game speed)

说明：  一个java聊天系统程序 主要针对学生的课程设术的需要(a java chat system program aimed at students in the course is set up to the needs)

Socket（套接字）最初是由加利福尼亚大学Berkeley（伯克利）分校为UNIX操作系统开发的网络通信接口，随着UNIX的广泛使用，Socket成为当前最流行的网络通信应用程序接口之一(Socket (socket) was originally developed by the University of California Berkeley (Berkeley) campus for the UNIX operating system, development of network communication interface, with the widespread use of UNIX, Socket become the most popular application programming interface of network communication)

Keep an eye on the open ports in your local pc. A java written port scanner which looks for the open ports in the given server and logs a report of them.

说明：  简单实现抽签功能。通过两个数组的定义及借助random方法实现(Draw a simple function to achieve. Through the definition and use of two arrays of random method)

用于求网络中从某一节点开始形成环路到该节点结束的节点编号。对于求路径的问题会有一定的帮助(Used to find a node the network began to form a loop to the end node node numbers. To seek the path of problem would certainly help)

cours to programme by using java

just for test and pls delete it.May upload some useful doc. later. Ta!

压缩包内包含主流应用中java的jar包的使用(the use of java jar.)