这个类提供了一个快速和更简单的方式来使用RC4算法来加密和解密文件。它也包括了用来打开，读取，编写和附加文件的方法。包括了一个类的演示客户端程序。- This kind has provided fast and the simpler way uses the RC4
algorithm to encrypt reconciles the dense document. It also included
has used for to open, reads takes, compilation and appended document
method. Including a kind of demonstration customer end procedure.