这是我自己做练习的文件，希望可以给初学者一些帮助

ext 多文件上传,这个我试过了，还是蛮不错的，推荐给大家-ext upload

用tcp,udp 实现的聊天室,都能正常运行,初学java网络编程的可参考-using tcp, udp achieve chat rooms, the normal operation of the network novice java programming reference

当本java文件运行时即备份本文件为一个副本。-when the java runtime documents that the backup copy of a document.

串的基本操作 主要是对串的比较,求串长等-The basic operation of the main string of string comparison, and long strings

java一些例子，包括从键盘接收输入字符串，并将其转换成整数的例子，产生一个随机数的例子-java examples include receiving input from the keyboard strings, and converting it into integer example, Generate a random number of examples, etc.

在JAVA学习中经常有人不会从键盘输入数据，如果你要一个字符串，那么请用 KB.scan()函数，附上源码-JAVA has often been in the study does not enter data from the keyboard, if you want a string, then please use KB.scan () function, accompanied by source code

关于JSP实例入门-introductory examples of JSP

java教学讲义-java Teaching Materials

PaintChat日本Java画图聊天程序-Paint PaintChat Japan Java chat program

专业为java开发的用于和excel交互的api函数。可以方便访问excel，我曾经使用该包做过excel数据的统计，比较好用-Professional development for java and excel for interactive api function. Can easily access excel, I have to use the package did excel statistical data to compare use