写一个程序，实现任意类型文件的复制。从命令行输入原始文件名，输出文件与原始文件同名但扩展名为.bak。程序文件命名为Exe6_1.java。-Write a program that, for any type of file replication. From the command line input to the original file name, output file with the original file name and extension of.Bak. Progra