Print Max Temperature with Days

import java.io.File;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.TreeSet;

public class TemperatureSorter {
  public static void main(String[] args) {
    Scanner in = null;
    try {
      in = new Scanner(new File("kion.txt"));
    }
    catch (Exception e) {
    }
    NavigableMap<Double, TreeSet<Integer>> temperature =
        new TreeMap<Double, TreeSet<Integer>>();
    int day = 0;
    while (in.hasNextLine()) {
      double temp = .0;
      try {
        temp = new Double(in.nextLine());
      }
      catch (Exception e) {
      }
      if (temperature.get(temp) == null) temperature.put(temp, new TreeSet<Integer>());
      temperature.get(temp).add(++day);
    }
    Entry<Double, TreeSet<Integer>> e = temperature.firstEntry();
    for (int i: e.getValue()) {
      System.out.println("" + i + "日: " + e.getKey());
    }
  }
}