Question

I want to take all Saturday and Sunday from given date range…

my inputs are

Start Date : 01/01/2011
End Date : 01/01/2012

now search date which is in between given start date and end date and day would be Saturday or Sunday.

Please Suggest…

Answer 1

Firstly, I’d recommend using Joda Time if you possibly can. It’s a much better date and time API than the one built into Java.

Secondly, unless you’re really worried about efficiency I would personally go for the incredibly-simple-but-somewhat-wasteful approach of simply iterating over every day in the time period, and including those which fall on the right days. Alternating between adding one day and adding six days would certainly be more efficient, but harder to change.

Sample code:

import java.util.*;
import org.joda.time.*;

public class Test
{
    public static void main(String[] args)
    {
        List<LocalDate> dates = getWeekendDates
            (new LocalDate(2011, 1, 1), new LocalDate(2011, 12, 1));
        for (LocalDate date : dates)
        {
            System.out.println(date);
        }
    }

    private static List<LocalDate> getWeekendDates
        (LocalDate start, LocalDate end)
    {
        List<LocalDate> result = new ArrayList<LocalDate>();
        for (LocalDate date = start;
             date.isBefore(end);
             date = date.plusDays(1))
        {
            int day = date.getDayOfWeek();
            // These could be passed in...
            if (day == DateTimeConstants.SATURDAY ||
                day == DateTimeConstants.SUNDAY)
            {
                result.add(date);
            }
        }
        return result;
    }                                            
}