AppEntrada

class AppEntrada {
   public static void main(String[] args) throws IOException {
     InputStream is = new FileInputStream("arquivo.txt");
     InputStreamReader isr = new InputStreamReader(is);
     BufferedReader br = new BufferedReader(isr);

     String s = br.readLine(); // primeira linha

     while (s != null) {
       System.out.println(s);
       s = br.readLine();
     }

     br.close();
   }
 }