Java Day of Week getWeekDayOfYear(Date date)

Description

get Week Day Of Year

License

Open Source License

Declaration

public static List<Date> getWeekDayOfYear(Date date) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class Main {
    private static final int DAYS_OF_A_WEEK = 7;

    public static List<Date> getWeekDayOfYear(Date date) {
        Calendar calendar = getCalendarFromDate(date);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.setMinimalDaysInFirstWeek(DAYS_OF_A_WEEK);
        int week = calendar.get(Calendar.WEEK_OF_YEAR);
        int year = calendar.get(Calendar.YEAR);

        List<Date> result = new ArrayList<Date>();
        result.add(getDateOfYearWeek(year, week, Calendar.MONDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.TUESDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.WEDNESDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.THURSDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.FRIDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.SATURDAY));
        result.add(getDateOfYearWeek(year, week, Calendar.SUNDAY));
        return result;
    }//w  w w  .  j a  va2  s . c om

    /**
     * get calendar from date
     *
     * @param date the passing date
     * @return the calendar instance
     */
    public static Calendar getCalendarFromDate(Date date) {
        Calendar calendar = getDefaultCalendar();
        calendar.setTime(date);
        return calendar;
    }

    private static Date getDateOfYearWeek(int yearNum, int weekNum, int dayOfWeek) {
        Calendar cal = Calendar.getInstance();
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);
        cal.setMinimalDaysInFirstWeek(DAYS_OF_A_WEEK);
        cal.set(Calendar.YEAR, yearNum);
        cal.set(Calendar.WEEK_OF_YEAR, weekNum);
        /*cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);*/
        return cal.getTime();
    }

    /**
     * get the default calendar
     *
     * @return the calendar instance
     */
    public static Calendar getDefaultCalendar() {
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        return calendar;
    }
}

Related

1. getWeekDay(Date date)
2. getWeekDay(Date dt, int weekDay)
3. getWeekDay(String strDate)
4. getWeekdayDate(Date actualDate)
5. getWeekdayInterval(Date date)
6. getWeekDays(String _date, int _amount)
7. getWeekDaysBetween(Date fromDate, Date toDate, int dayOfWeek)
8. getWeekEnd(Date date, int w)
9. getWeekFirstDay(Date weekday)