I have no idea on how to get a file name that starts with a variable value in a specified path.
For an example:
I have a string variable : String val = "tax_";
I have a path : String up_paths = "C:/foldername";
A file named tax_file.txt exists in "C:/foldername".
The program is able to get the file name that starts with "tax_" in the path C:/foldername. Then the "tax_file.txt" will return.