Accessing a file not in the same directory

I would like to get the first line of a txt file and perform certain analysis on it, I can do this when the file is located in the same directory but i'm experiencing problems when it comes to trying to get a file outside of my current folder .
What do I need to do when I recieve the string from the user containing the directory and name of the file (e.g. C:\Test\file.txt).
Any help would be appreciated

refer following code.
String path = "C:\\Test\\file.txt";
               BufferedReader reader = new BufferedReader(new FileReader(new File(path)));
               System.out.println(reader.readLine());     

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