Test

public class File {

    ArrayList<String> filelist;

    File(ArrayList<String> filelist) {
        this.filelist = new ArrayList<String>();
    }

    public static File readFile(String name) throws FileNotFoundException {
        Scanner scanner = null;
        scanner = new Scanner(new BufferedReader(new FileReader(name)));
        ArrayList<String> filelist = new ArrayList<String>();
        while (scanner.hasNextLine()) {
            filelist.add(scanner.nextLine());
        }
        File file = new File(filelist);
        return file;
    }
}

public class Spy extends Thread {
    ArrayList<File> fileCollection;

    public Spy() {
        this.fileCollection = new ArrayList<File>();
    }

    public void obsFile(File filelist) throws InterruptedException {
        boolean b = true;
        while (b) {
            this.fileCollection.add(filelist);
            Thread.sleep(1500);
            int a = fileCollection.size() - 1;
            System.out.println(fileCollection.get(0).equals((fileCollection.get(a))));
        }
    }
}

public class Test {
    public static void main(String[] args) throws InterruptedException {

        System.out.print("Enter the first file name" + "\n");
        Scanner sc = new Scanner(System.in);
        String Name = sc.nextLine();
        try {
            File file1 = File.readFile(Name);
            Spy spy = new Spy();
            spy.obsFile(file1);

        } catch (FileNotFoundException ex) {
            System.out.print("There are no files with such name!");
            sc.close();
            return;
        }
    }
}