How to find day after N years in Java?



Problem Description :


Write a program in Java that finds a day after N years. For example - on 26th Jan 2017 day is Thursday and 10 years later on same date 26th Jan 2027 day will be Tuesday.

Concept :


The solution of this problem is very simple. With the help of Calendar class constant YEAR and DAY_OF_WEEK we can easily solve this problem. If you know how to find a day before N years then believe me guys this problem is a piece of cake.

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Java Program :


package com.javamultiplex.datetime;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

/**
 * 
 * @author Rohit Agarwal
 * @category Date and Time Problems
 * @problem Day after N years?
 *
 */
public class DayAfterNYears {

 public static void main(String[] args) {

  Scanner input = null;
  try {
   input = new Scanner(System.in);
   System.out.println("Enter number of years : ");
   int years = input.nextInt();
   // Creating Calendar class instance
   Calendar calendar = Calendar.getInstance();
   String currentDate = getStringFromCalendar(calendar);
   int dayofWeek = calendar.get(Calendar.DAY_OF_WEEK);
   String dayName = getDayName(dayofWeek);
   System.out.println("Current Date (dd/MM/yyyy) :" + currentDate + " and Day :" + dayName);
   // Adding years in Calendar.
   calendar.add(Calendar.YEAR, years);
   String newDate = getStringFromCalendar(calendar);
   dayofWeek = calendar.get(Calendar.DAY_OF_WEEK);
   dayName = getDayName(dayofWeek);
   System.out.println("After " + years + " year/s Date (dd/MM/yyyy) :" + newDate + " and Day :" + dayName);

  } finally {
   if (input != null) {
    input.close();
   }
  }

 }

 private static String getDayName(int dayofWeek) {

  String dayName = null;
  switch (dayofWeek) {
  case 1:
   dayName = "Sunday";
   break;
  case 2:
   dayName = "Monday";
   break;
  case 3:
   dayName = "Tuesday";
   break;
  case 4:
   dayName = "Wednesday";
   break;
  case 5:
   dayName = "Thursday";
   break;
  case 6:
   dayName = "Friday";
   break;
  case 7:
   dayName = "Saturday";
   break;
  }
  return dayName;
 }

 private static String getStringFromCalendar(Calendar calendar) {

  // Converting Calendar to Date.
  Date currentDate = calendar.getTime();
  DateFormat format = new SimpleDateFormat("dd/MM/yyyy");
  // Converting Date to String.
  String myCurrentDate = format.format(currentDate);
  return myCurrentDate;
 }

}



Output :


Output of Java program that finds a day after N years.
Output - How to find a day after N years in Java?

References :


https://docs.oracle.com/javase/7/docs/api/java/util/Date.html

https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Date and Time problems, Day after n years, Solution in Java, DateFormat, SimpleDateFormat, String, Calendar, switch statement.

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How to find day after N years in Java? How to find day after N years in Java? Reviewed by Rohit Agarwal on 1/26/2017 Rating: 5

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