Java by API/java.util/Calendar

Содержание

1 Calendar: add(int field, int amount)
2 Calendar: after(Object when)
3 Calendar.AM_PM
4 Calendar: before(Object when)
5 Calendar.DATE
6 Calendar: DAY_OF_WEEK
7 Calendar.DAY_OF_WEEK_IN_MONTH
8 Calendar.DAY_OF_YEAR
9 Calendar.DST_OFFSET
10 Calendar.ERA
11 Calendar: getActualMaximum(int field)
12 Calendar: getDisplayNames(int field, int style, Locale locale)
13 Calendar: getFirstDayOfWeek()
14 Calendar: getInstance()
15 Calendar: getTime()
16 Calendar.HOUR
17 Calendar.HOUR_OF_DAY
18 Calendar: int get(int field)
19 Calendar.MILLISECOND
20 Calendar.MINUTE
21 Calendar.MONDAY
22 Calendar.SECOND
23 Calendar: set(int field, int value)
24 Calendar: set(int year, int month, int date)
25 Calendar: setTime(Date date)
26 Calendar: setTimeInMillis(long millis)
27 Calendar.SUNDAY
28 Calendar: TUESDAY
29 Calendar.WEEK_OF_MONTH
30 Calendar.WEEK_OF_YEAR
31 Calendar.YEAR
32 Calendar.ZONE_OFFSET

Calendar: add(int field, int amount)

   
/*
It is now Thu 2006/05/11 at 02:11:22 PM PDT
Two years ago was Tue 2004/05/11 at 02:11:22 PM PDT
 * */
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class MainClass {
  public static void main(String[] a) throws Exception {
    Calendar now = Calendar.getInstance();
    SimpleDateFormat formatter = new SimpleDateFormat("E yyyy/MM/dd "at" hh:mm:ss a zzz");
    System.out.println("It is now " + formatter.format(now.getTime()));
    now.add(Calendar.YEAR, -2);
    System.out.println("Two years ago was " + formatter.format(now.getTime()));
  }
}

Calendar: after(Object when)

   
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Main {
  public static void main(String[] a) {
    GregorianCalendar today = new GregorianCalendar();
    GregorianCalendar thisDate = new GregorianCalendar();
    thisDate.set(Calendar.YEAR, 2000);
    if (thisDate.before(today)) {
      System.out.println("before");
    }
    if (today.after(thisDate)) {
      System.out.println("after");
    }
  }
}

Calendar.AM_PM

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar: before(Object when)

   
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Main {
  public static void main(String[] a) {
    GregorianCalendar today = new GregorianCalendar();
    GregorianCalendar thisDate = new GregorianCalendar();
    thisDate.set(Calendar.YEAR, 2000);
    if (thisDate.before(today)) {
      System.out.println("before");
    }
    if (today.after(thisDate)) {
      System.out.println("after");
    }
  }
}

Calendar.DATE

   
/*
 * Output: 
Date: Apr 25 2006
Time: 4:36:28
Updated time: 10:29:22
 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    String months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
        "Sep", "Oct", "Nov", "Dec" };
    Calendar calendar = Calendar.getInstance();
    System.out.print("Date: ");
    System.out.print(months[calendar.get(Calendar.MONTH)]);
    System.out.print(" " + calendar.get(Calendar.DATE) + " ");
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.print("Time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
    calendar.set(Calendar.HOUR, 10);
    calendar.set(Calendar.MINUTE, 29);
    calendar.set(Calendar.SECOND, 22);
    System.out.print("Updated time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
  }
}

Calendar: DAY_OF_WEEK

   
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Main {
  public static void main(String[] a) {
    GregorianCalendar calendar = new GregorianCalendar();
    calendar.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
    int day = calendar.get(Calendar.DAY_OF_WEEK);
    switch (day) {
    case Calendar.MONDAY:
      System.out.println(Calendar.MONDAY);
      break;
    case Calendar.TUESDAY:
      System.out.println(Calendar.TUESDAY);
      break;
    default:  
      System.out.println("others");
    }
  }
}

Calendar.DAY_OF_WEEK_IN_MONTH

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar.DAY_OF_YEAR

   
/*
 * Output:
250 days remain in current year 
 */
import java.util.Calendar;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar1 = Calendar.getInstance();
    int doy1 = calendar1.get(Calendar.DAY_OF_YEAR);
    int year = calendar1.get(Calendar.YEAR);
    Calendar calendar2 = new GregorianCalendar(year, 11, 31);
    int doy2 = calendar2.get(Calendar.DAY_OF_YEAR);
    int days = doy2 - doy1;
    System.out.println(days + " days remain in current year");
  }
}

Calendar.DST_OFFSET

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar.ERA

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar: getActualMaximum(int field)

 
import java.util.Calendar;
public class Main {
  public static void main(String[] argv) throws Exception {
    Calendar cal = Calendar.getInstance();
    int days = cal.getActualMaximum(Calendar.DAY_OF_MONTH); // 28
  }
}

Calendar: getDisplayNames(int field, int style, Locale locale)

  

import java.util.Calendar;
import java.util.Locale;
import java.util.Map;
import java.util.NavigableMap;
import java.util.TreeMap;
public class Main {
  public static void main(String args[]) {
    Calendar now = Calendar.getInstance();
    Locale locale = Locale.getDefault();
    Map<String, Integer> names = now.getDisplayNames(Calendar.DAY_OF_WEEK, Calendar.LONG, locale);
    NavigableMap<String, Integer> nav = new TreeMap<String, Integer>(names);
    System.out.printf("Whole list:%n%s%n", nav);
  }
}

Calendar: getFirstDayOfWeek()

   
import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.Locale;
public class MainClass {
  public static void main(String[] argv) {
    Calendar JO_cal = Calendar.getInstance(new Locale("ar", "JO"));
    Calendar FR_cal = Calendar.getInstance(Locale.FRANCE);
    Calendar CA_cal = Calendar.getInstance(Locale.CANADA);
    DateFormatSymbols dfs = new DateFormatSymbols();
    String weekdays[] = dfs.getWeekdays();
    System.out.println(weekdays[JO_cal.getFirstDayOfWeek()]);
    System.out.println(weekdays[FR_cal.getFirstDayOfWeek()]);
    System.out.println(weekdays[CA_cal.getFirstDayOfWeek()]);
  }
}

Calendar: getInstance()

   
/*
 * Output:
2006
1
13
21


 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar = Calendar.getInstance();
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.println(calendar.get(Calendar.HOUR));
    System.out.println(calendar.get(Calendar.HOUR_OF_DAY));
    System.out.println(calendar.get(Calendar.MINUTE));
  }
}

Calendar: getTime()

 
import java.util.Calendar;
public class Main {
  public static void main(String[] args) {
    int year = 2009;
    int month = 0; // January
    int date = 1;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(Calendar.YEAR, year);
    cal.set(Calendar.MONTH, month);
    cal.set(Calendar.DATE, date);
    java.util.Date utilDate = cal.getTime();
    System.out.println(utilDate);
  }
}

Calendar.HOUR

   
/*
 * Output:
2006
1
13
21


 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar = Calendar.getInstance();
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.println(calendar.get(Calendar.HOUR));
    System.out.println(calendar.get(Calendar.HOUR_OF_DAY));
    System.out.println(calendar.get(Calendar.MINUTE));
  }
}

Calendar.HOUR_OF_DAY

   
/*
 * Output:
2006
1
13
21


 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar = Calendar.getInstance();
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.println(calendar.get(Calendar.HOUR));
    System.out.println(calendar.get(Calendar.HOUR_OF_DAY));
    System.out.println(calendar.get(Calendar.MINUTE));
  }
}

Calendar: int get(int field)

   
import java.util.Calendar;
public class Main{
  public static void main(String[] args){
     Calendar calendar = Calendar.getInstance ();
     
     System.out.println(calendar.get(Calendar.YEAR));
     System.out.println(calendar.get(Calendar.MONTH));
     System.out.println(calendar.get(Calendar.DATE));
     System.out.println(calendar.get(Calendar.HOUR));
     System.out.println(calendar.get(Calendar.MINUTE));
     System.out.println(calendar.get(Calendar.SECOND));
     System.out.println(calendar.get(Calendar.MILLISECOND));
  }
}

Calendar.MILLISECOND

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar.MINUTE

   
/*
 * Output:
2006
1
13
21


 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar = Calendar.getInstance();
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.println(calendar.get(Calendar.HOUR));
    System.out.println(calendar.get(Calendar.HOUR_OF_DAY));
    System.out.println(calendar.get(Calendar.MINUTE));
  }
}

Calendar.MONDAY

   
/**
 *Output:
THURSDAY
 */
import java.util.Calendar;
import java.util.Date;
public class MainClass {
  public static void main(String args[]) {
    Calendar cal = Calendar.getInstance();
    Date now = new Date();
    cal.setTime(now);
    int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
    if (dayofweek == Calendar.SUNDAY)
      System.out.println("SUNDAY");
    if (dayofweek == Calendar.MONDAY)
      System.out.println("MONDAY");
    if (dayofweek == Calendar.TUESDAY)
      System.out.println("TUESDAY");
    if (dayofweek == Calendar.WEDNESDAY)
      System.out.println("WEDNESDAY");
    if (dayofweek == Calendar.THURSDAY)
      System.out.println("THURSDAY");
    if (dayofweek == Calendar.FRIDAY)
      System.out.println("FRIDAY");
    if (dayofweek == Calendar.SATURDAY) {
      System.out.println("SATURDAY");
    }
  }
}

Calendar.SECOND

   
/*
 * Output: 
Date: Apr 25 2006
Time: 4:36:28
Updated time: 10:29:22
 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    String months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
        "Sep", "Oct", "Nov", "Dec" };
    Calendar calendar = Calendar.getInstance();
    System.out.print("Date: ");
    System.out.print(months[calendar.get(Calendar.MONTH)]);
    System.out.print(" " + calendar.get(Calendar.DATE) + " ");
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.print("Time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
    calendar.set(Calendar.HOUR, 10);
    calendar.set(Calendar.MINUTE, 29);
    calendar.set(Calendar.SECOND, 22);
    System.out.print("Updated time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
  }
}

Calendar: set(int field, int value)

   
/*
 * Output: 
Date: Apr 25 2006
Time: 4:36:28
Updated time: 10:29:22
 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    String months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
        "Sep", "Oct", "Nov", "Dec" };
    Calendar calendar = Calendar.getInstance();
    System.out.print("Date: ");
    System.out.print(months[calendar.get(Calendar.MONTH)]);
    System.out.print(" " + calendar.get(Calendar.DATE) + " ");
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.print("Time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
    calendar.set(Calendar.HOUR, 10);
    calendar.set(Calendar.MINUTE, 29);
    calendar.set(Calendar.SECOND, 22);
    System.out.print("Updated time: ");
    System.out.print(calendar.get(Calendar.HOUR) + ":");
    System.out.print(calendar.get(Calendar.MINUTE) + ":");
    System.out.println(calendar.get(Calendar.SECOND));
  }
}

Calendar: set(int year, int month, int date)

   
import java.util.Calendar;
public class Main {
  public static void main(String[] args) {
    Calendar calendar = Calendar.getInstance();
    calendar.set(2001, 1, 1);
  }
}

Calendar: setTime(Date date)

   
import java.util.Calendar;
import java.util.Date;
public class Main {
  public static void main(String[] args) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(new Date());
  }
}

Calendar: setTimeInMillis(long millis)

 
 
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Main {
  public static void main(String[] args) {
    DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.SSS");
    long now = System.currentTimeMillis();
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(now);
    System.out.println(now + " = " + formatter.format(calendar.getTime()));
  }
}

Calendar.SUNDAY

   
/**
 *Output:
THURSDAY
 */
import java.util.Calendar;
import java.util.Date;
public class MainClass {
  public static void main(String args[]) {
    Calendar cal = Calendar.getInstance();
    Date now = new Date();
    cal.setTime(now);
    int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
    if (dayofweek == Calendar.SUNDAY)
      System.out.println("SUNDAY");
    if (dayofweek == Calendar.MONDAY)
      System.out.println("MONDAY");
    if (dayofweek == Calendar.TUESDAY)
      System.out.println("TUESDAY");
    if (dayofweek == Calendar.WEDNESDAY)
      System.out.println("WEDNESDAY");
    if (dayofweek == Calendar.THURSDAY)
      System.out.println("THURSDAY");
    if (dayofweek == Calendar.FRIDAY)
      System.out.println("FRIDAY");
    if (dayofweek == Calendar.SATURDAY) {
      System.out.println("SATURDAY");
    }
  }
}

Calendar: TUESDAY

   
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Main {
  public static void main(String[] a) {
    GregorianCalendar calendar = new GregorianCalendar();
    calendar.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
  }
}

Calendar.WEEK_OF_MONTH

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar.WEEK_OF_YEAR

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Calendar.YEAR

   
/*
 * Output:
2006
1
13
21


 */
import java.util.Calendar;
public class MainClass {
  public static void main(String args[]) {
    Calendar calendar = Calendar.getInstance();
    System.out.println(calendar.get(Calendar.YEAR));
    System.out.println(calendar.get(Calendar.HOUR));
    System.out.println(calendar.get(Calendar.HOUR_OF_DAY));
    System.out.println(calendar.get(Calendar.MINUTE));
  }
}

Calendar.ZONE_OFFSET

   
/*
ERA: 1
YEAR: 2006
MONTH: 4
WEEK_OF_YEAR: 19
WEEK_OF_MONTH: 2
DATE: 11
DAY_OF_MONTH: 11
DAY_OF_WEEK: 5
DAY_OF_WEEK_IN_MONTH: 2
AM_PM: 1
MILLISECOND: 16
ZONE_OFFSET: -8
DST_OFFSET: 1 
 * */
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class MainClass {
  public static void main(String[] a) {
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    System.out.println("ERA: " + calendar.get(Calendar.ERA));
    System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
    System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
    System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
    System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
    System.out.println("DATE: " + calendar.get(Calendar.DATE));
    System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
    System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
    System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM));
    System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
    System.out.println("ZONE_OFFSET: "+ (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000)));
    System.out.println("DST_OFFSET: "+ (calendar.get(Calendar.DST_OFFSET)/(60*60*1000)));
  }
}

Java by API/java.util/Calendar

Содержание

Calendar: add(int field, int amount)

Calendar: after(Object when)

Calendar.AM_PM

Calendar: before(Object when)

Calendar.DATE

Calendar: DAY_OF_WEEK

Calendar.DAY_OF_WEEK_IN_MONTH

Calendar.DAY_OF_YEAR

Calendar.DST_OFFSET

Calendar.ERA

Calendar: getActualMaximum(int field)

Calendar: getDisplayNames(int field, int style, Locale locale)

Calendar: getFirstDayOfWeek()

Calendar: getInstance()

Calendar: getTime()

Calendar.HOUR

Calendar.HOUR_OF_DAY

Calendar: int get(int field)

Calendar.MILLISECOND

Calendar.MINUTE

Calendar.MONDAY

Calendar.SECOND

Calendar: set(int field, int value)

Calendar: set(int year, int month, int date)

Calendar: setTime(Date date)

Calendar: setTimeInMillis(long millis)

Calendar.SUNDAY

Calendar: TUESDAY

Calendar.WEEK_OF_MONTH

Calendar.WEEK_OF_YEAR

Calendar.YEAR

Calendar.ZONE_OFFSET

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