LineReader

java

    final FileReader in = new FileReader(new File("lines.txt"));
    BufferedReader reader = new BufferedReader(in);

    final ArrayList<String> strings = new ArrayList<>();

    String line;

    while ((line = reader.readLine()) != null) {
      strings.add(line);
    }

    reader.close();

    String[] array = strings.toArray(new String[0]);

    Arrays.sort(array);

    for (String s : array) {
      System.out.println(s);
    }