// ...
public void catenate(String name, Path currentDirectory) {
    Path path = checkIfExists(name, currentDirectory);
    if (path != null && Files.isRegularFile(path) && Files.isReadable(path)) {
        Charset charset = Charset.forName("UTF-8");
	try (BufferedReader bufferedReader = Files.newBufferedReader(path, charset)) {
	    String line = null;
	    while ((line = bufferedReader.readLine()) != null)
	        System.out.println(line);
	} catch (IOException ioException) {
	    System.out.println("Operation could not be performed !"+ioException.getMessage());
	}
    }
    else
        System.out.format("Could not display the contents of file %s!%n",name);
}
// ...