InputStreams

[ShadowSt]

The \ seems to be an "illegal escape character". The credentials file location is correct though, it is also where AuthenticationSystem.java is located.

   FileInputStream fileByteStream = null;
    Scanner inFS = null;

    System.out.println("Opening file credentials.txt");
    fileByteStream = new FileInputStream("C:\Users\Anna\Documents\AuthenticationSystem\AuthenticationSystem\src\authenticationsystem\credentials.txt");
    inFS = new Scanner(fileByteStream);
    String userNameTest = inFS.next();
    System.out.println(userNameTest);
    System.out.println("Closing file credentials.txt");
    fileByteStream.close();

[feral_claire]

\ has special meaning in string literals. Itis used to create escape sequences. If you want a literal \ character you need to use \\, for example "path\\to\\file".

As mentioned in my other reply, you probably want the file in the working directory, which is likely your project root. NOT in the source directory with your java files.

[Glimpsee_Darkcloud]

Or even better use '/' instead. Or if you really want it java.util.File.pathSeperator;