Total amounts of each items

import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Formatter;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.TreeMap;

public class Total {
  public static void main(String[] args) {
    Scanner in = null;
    try {
      in = new Scanner(Paths.get("shukei.csv"));
    }
    catch (Exception e) {
      e.printStackTrace();
    }
    in.useDelimiter("\\s*,\\s*|\n");
    Map<String, Double> total = new TreeMap<String, Double>();
    while (in.hasNextLine()) {
      if (!in.hasNext()) break;
      String key = in.next();
      in.next(); // ignore date
      in.next(); // ignore item
      double amount = in.nextDouble();
      if (!total.containsKey(key)) total.put(key, 0.);
      total.put(key, total.get(key) + amount);
    }
    in.close();
    Writer out = null;
    try {
      out =
        Files.newBufferedWriter(Paths.get("result.csv"),
          Charset.forName("UTF-8"), StandardOpenOption.WRITE,
          StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
    Formatter f = new Formatter(out);
    for (Entry<String, Double> e: total.entrySet()) {
      f.format("%s,%.1f\n", e.getKey(), e.getValue());
    }
    f.close();
  }
}