путь указываю так: C:\Users\IGOR\Desktop\q BufferedReader reader= new BufferedReader(new InputStreamReader(System.in)); String read = reader.readLine(); FileInputStream fileRead = new FileInputStream(read); reader.close(); ArrayList<Integer> list = new ArrayList<>(); while(fileRead.available()>0){ int b = fileRead.read(); list.add(b); } fileRead.close(); Comparable max = Collections.max(list); System.out.println(max);