Print Temperature Avarage

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class TemperatureAvarage {
  public static void main(String[] args) {
    Scanner in = null;
    try {
      in = new Scanner(new File("kion.txt"));
    }
    catch (Exception e) {
    }
    int days = 0;
    List<Double> temperature = new ArrayList<Double>();
    while (in.hasNextLine()) {
      double temp = .0;
      try {
        temp = new Double(in.nextLine());
      }
      catch (Exception e) {
      }
      temperature.add(temp);
      days++;
    }
    double sum = .0;
    for (Double temp: temperature) {
      sum += temp;
    }
    System.out.println("平均: " + sum / days);
  }
}