e013. constructing a filename path.txt

这里面包含了一百多个JAVA源文件

A File object is used to represent a filename. Creating the File object has no effect on the file system; the filename need not exist nor is it created. 
On Windows, this example creates the path \a\b. On Unix, the path would be /a/b. 

    String path = File.separator + "a" + File.separator + "b";