How to get day name of given date in Java?



Problem Description :


Write a program in Java that prints day name of given date.

Concept :


We are using below method of Calendar class that is present in java.util.* package.

public int get(int field) -> In this method we have to pass Calendar class constant DAY_OF_WEEK and finally this method returns one value from 1-7. After that using switch case we are printing day name.

Recommended :




Java Program :


package com.javamultiplex.datetime;

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

/**
 * 
 * @author Rohit Agarwal
 * @category Date and Time
 * @problem How to get day name of given date?
 * 
 */
public class GetWeekDayName {

 public static void main(String[] args) {

  Scanner input = null;
  try {
   input = new Scanner(System.in);
   System.out.println("Enter date in dd/MM/yyyy format :");
   String date = input.next();
   // If Date is valid, converting String to Date
   Date mydate = getValidDate(date);
   if (mydate != null) {
    // Creating Calendar class instance.
    Calendar calendar = Calendar.getInstance();
    // Converting Date to Calendar.
    calendar.setTime(mydate);
    int dayofWeek = calendar.get(Calendar.DAY_OF_WEEK);
    String dayName = getDayName(dayofWeek);
    System.out.println("Day : " + dayName);
   } else {
    System.out.println("Date is invalid.");
   }
  } finally {
   if (input != null) {
    input.close();
   }
  }

 }

 private static Date getValidDate(String date) {

  Date mydate = null;
  if (isValidDateFormat(date)) {
   /*
    * d -> Day of month 
    * M -> Month of year 
    * y -> Year
    */
   DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
   /*
    * By default setLenient() is true. We should make it false for
    * strict date validations.
    * 
    * If setLenient() is true - It accepts all dates. If setLenient()
    * is false - It accepts only valid dates.
    */
   dateFormat.setLenient(false);
   try {
    mydate = dateFormat.parse(date);
   } catch (ParseException e) {
    mydate = null;
   }
  }
  return mydate;
 }

 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 boolean isValidDateFormat(String date) {

  /*
   * Regular Expression that matches String with format dd/MM/yyyy. 
   * dd ->  01-31 
   * MM -> 01-12 
   * yyyy -> 4 digit number
   */
  String pattern = "(0?[1-9]|[12][0-9]|3[01])\\/(0?[1-9]|1[0-2])\\/([0-9]{4})";
  boolean result = false;
  if (date.matches(pattern)) {
   result = true;
  }
  return result;
 }

}


Output :


Output of Java program that prints day name of given date.
Output - How to print day name of given date in Java?

References :





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Tags : Date and Time problems, Get day name, Solution in Java,  String, Regular expressions, DateFormat, SimpleDateFormat, if else statement, switch statement, Calendar.

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How to get day name of given date in Java? How to get day name of given date in Java? Reviewed by Rohit Agarwal on 12/07/2016 Rating: 5

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