public void load(String filename) throws Exception {
    File file = new File(filename);
    if (!file.exists()) {
      System.out.println("The file '" + filename + "' does not exist");
      return;
    }
    Scanner fscan = new Scanner(file);
    for (int i=0; fscan.hasNext() == true; i++) {
      Person p = new Person();
      p.name = fscan.nextLine();
      p.address = fscan.nextLine();
      if (fscan.hasNextInt()) {
        p.age = fscan.nextInt();
      }
      if (fscan.hasNext()) {
        fscan.nextLine();
      }
      PersonList.add(i, p);
    }
  }