How to Get a Particular Day List in a Month using Java

on January 2, 2017

Post Views: 1,873

Get a Particular Day List in Java

In this example, We will show you about, How to get a particular day list in a month using java

1) Getting Day List from Specific Day

private static List<Date> getSpecificDay(int year, int month, int specificDay) {
List<Date> dateList = new ArrayList<Date>();
Calendar calendar = Calendar.getInstance();
// The month is 0-based in calendar
calendar.set(year, month - 1, 1);
int totalDaysInMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
for (int day = 1; day <= totalDaysInMonth; day++) {
calendar.set(year, month - 1, day);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
if (dayOfWeek == specificDay) {
dateList.add(calendar.getTime());
}
}
return dateList;
}

2) Formatting the Date

private static String formatDate(Date date) {
// you can change the format accordingly
final String format = "d MMM, yyyy";
DateFormat df = new SimpleDateFormat(format);
return df.format(date);
}

3) Getting the day name

private static String getDay(int day) {
switch(day) {
case 1:
return "Sunday";
case 2:
return "Monday";
case 3:
return "Tuesday";
case 4:
return "Wednesday";
case 5:
return "Thursday";
case 6:
return "Friday";
case 7:
return "Saturday";
}
return "NA";
}

4) Final Example

package com.dineshkrish.date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
public class GetDays {
private static List<Date> getSpecificDay(int year, int month,
int specificDay) {
List<Date> dateList = new ArrayList<Date>();
Calendar calendar = Calendar.getInstance();
// The month is 0-based in calendar
calendar.set(year, month - 1, 1);
int totalDaysInMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
for (int day = 1; day <= totalDaysInMonth; day++) {
calendar.set(year, month - 1, day);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
if (dayOfWeek == specificDay) {
dateList.add(calendar.getTime());
}
}
return dateList;
}
private static String formatDate(Date date) {
// you can change the format accordingly
final String format = "d MMM, yyyy";
DateFormat df = new SimpleDateFormat(format);
return df.format(date);
}
private static String getDay(int day) {
switch(day) {
case 1:
return "Sunday";
case 2:
return "Monday";
case 3:
return "Tuesday";
case 4:
return "Wednesday";
case 5:
return "Thursday";
case 6:
return "Friday";
case 7:
return "Saturday";
}
return "NA";
}
public static void main(String[] args) {
// Note : 1 - 7 (ie: Sunday - Saturday)
int[] days = { 1, 2, 3, 4, 5, 6, 7 };
int month = 1;
int year = 2017;
for (int i = 0; i < days.length; i++) {
List<Date> dateList = getSpecificDay(year, month, days[i]);
System.out.println(getDay(days[i]));
System.out.println("--------------------------");
for (Date date : dateList) {
System.out.println(formatDate(date));
}
System.out.println();
}
}
}