Operations on the week time in Java

In a recent OA, I need to determine whether two dates are the same week, and according to a given date, the dates of the Monday and Friday that belong to the week.

When I finished this task, I found that calendar is really a powerful class.

Below gives the source code, for the brothers to refer to correct.


/*
* Date Created 2005-3-30

Package Com.infoearth;

Import Java.sql.Timestamp;
Import Java.text.SimpleDateFormat;
Import java.util.*;
/**
* @ Li Chunlei
*
public class Manageweek {
Determine whether two dates are in the same week
Boolean issameweekdates (Date date1, date date2) {
Calendar Cal1 = Calendar.getinstance ();
Calendar Cal2 = Calendar.getinstance ();
Cal1.settime (date1);
Cal2.settime (DATE2);
int subyear = Cal1.get (calendar.year)-Cal2.get (calendar.year);
if (0 = subyear) {
if (Cal1.get (calendar.week_of_year) = = Cal2.get (calendar.week_of_year))
return true;
}
else if (1 = = Subyear && = Cal2.get (calendar.month)) {
If the last week of December spans the first week of the next year, the last week will be the first week of the coming year.
if (Cal1.get (calendar.week_of_year) = = Cal2.get (calendar.week_of_year))
return true;
}
else if ( -1 = = Subyear && = Cal1.get (calendar.month)) {
if (Cal1.get (calendar.week_of_year) = = Cal2.get (calendar.week_of_year))
return true;
}
return false;
}


Generate a weekly sequence
public static String Getseqweek () {
Calendar C = calendar.getinstance (Locale.china);
String week = integer.tostring (C.get (calendar.week_of_year));
if (Week.length () ==1) week = "0" + week;
String year = integer.tostring (C.get (calendar.year));
return year+week;

}

Get the Monday date
public static String Getmonday (date date) {
Calendar C = calendar.getinstance ();
C.settime (date);
C.set (Calendar.day_of_week,calendar.monday);
return new SimpleDateFormat ("Yyyy-mm-dd"). Format (C.gettime ());
}


Get the Friday date
public static String Getfriday (date date) {
Calendar C = calendar.getinstance ();
C.settime (date);
C.set (Calendar.day_of_week,calendar.friday);
return new SimpleDateFormat ("Yyyy-mm-dd"). Format (C.gettime ());


}

public static void Main (string[] args) {

}

}