Advanced Java Create a program that reads the files: date_diff.csv. The program

Question

Advanced Java

Create a program that reads the files: date_diff.csv. The program should read all of the records and calculate the number of days between the two dates and print out the number of days, and then translate it into years, months and days. When the file is finished, list the number of dates that start in each month with the number.

Input

8-May-93,Sep. 24, 2013

Feb. 8, 1989,Feb. 1, 1991

Feb. 27, 2006,Nov. 3, 2015

Output

Days . Years, Months, Days

7444    20, 4, 16

723     1, 11, 24

3536    9, 8, 7

===============

Apr 17

Aug 18

Dec 19

Explanation / Answer

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class DateDiff {

   public static void main(String[] args) throws ParseException {

       // First We need to parse each line of the file and then we need to make two
       // date objects for calculation
       // As per given data there are 4 tokens in each line separted by comma
       SimpleDateFormat format = new SimpleDateFormat("MMM/dd/yyyy");
       ArrayList<String> lines = readFile();
       // loop through lines
       Date d2 = null;
       Date d1 = null;
      
       System.out.println("Days "+" "+"Years"+" "+"Months"+" "+" Days");
       for (String string : lines) {
           // get tokens
           String[] tokens = string.split(",");
           // first and second token is of date 1
           // first token needs to be splitted by space
           String[] dayMonth = tokens[0].split("\.");
           d1 = format.parse(dayMonth[0] + "/" + dayMonth[1] + "/" + tokens[1]);

           // for date 2
           // first token needs to be splitted by space
           dayMonth = tokens[2].split("\.");
           d2 = format.parse(dayMonth[0] + "/" + dayMonth[1] + "/" + tokens[3]);
          
           System.out.println(getDateDifference(d1, d2));
       }

  
   }

   // Read the file
   private static ArrayList<String> readFile() {
       List<String> list = null;
       try {
           list = Files.readAllLines(new File("./date_diff.csv").toPath(), Charset.defaultCharset());
       } catch (IOException e) {
           e.printStackTrace();
       }
       return (ArrayList<String>) list;
   }

   public static String getDateDifference(Date from, Date to) {
       long diffInMillies = Math.abs(to.getTime() - from.getTime());
       long days = TimeUnit.DAYS.convert(diffInMillies, TimeUnit.MILLISECONDS);
      
        Calendar fromDate=Calendar.getInstance();
        Calendar toDate=Calendar.getInstance();
        fromDate.setTime(from);
        toDate.setTime(to);
        int increment = 0;
        int year,month,day;
        if (fromDate.get(Calendar.DAY_OF_MONTH) > toDate.get(Calendar.DAY_OF_MONTH)) {
            increment =fromDate.getActualMaximum(Calendar.DAY_OF_MONTH);
        }
            // DAY CALCULATION
        if (increment != 0) {
            day = (toDate.get(Calendar.DAY_OF_MONTH) + increment) - fromDate.get(Calendar.DAY_OF_MONTH);
            increment = 1;
        } else {
            day = toDate.get(Calendar.DAY_OF_MONTH) - fromDate.get(Calendar.DAY_OF_MONTH);
        }

        if ((fromDate.get(Calendar.MONTH) + increment) > toDate.get(Calendar.MONTH)) {
            month = (toDate.get(Calendar.MONTH) + 12) - (fromDate.get(Calendar.MONTH) + increment);
            increment = 1;
        } else {
            month = (toDate.get(Calendar.MONTH)) - (fromDate.get(Calendar.MONTH) + increment);
            increment = 0;
        }

        year = toDate.get(Calendar.YEAR) - (fromDate.get(Calendar.YEAR) + increment);
         return   days+" "+year+" "+month+" "+day;
    }

}

output/;

Days        Years       Months       Days
7444       20       4       16
723       1       11       21
3536       9       8       4

input file

May.8,1993,Sep. 24, 2013
Feb.8, 1989,Feb. 1, 1991
Feb.27, 2006,Nov. 3, 2015

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