在Java 7中处理周数

import java.text.DateFormat;

import java.util.Calendar;

import java.util.SimpleTimeZone;
/**
 from
* 时代Java 
**/


public class Main {


    public static void main(String[] args) {

        Calendar calendar = Calendar.getInstance();

        

        if(calendar.isWeekDateSupported()) {

            System.out.println("Number of weeks in this year: " + calendar.getWeeksInWeekYear());

            System.out.println("Current week number: " + calendar.get(Calendar.WEEK_OF_YEAR));
            /**
            来 自 nowjava - 时  代  Java
            **/

        }


        calendar.setWeekDate(2012, 16, 3);

        System.out.println(DateFormat.getDateTimeInstance(

            DateFormat.LONG, DateFormat.LONG).format(calendar.getTime()));

        

        calendar.setWeekDate(2022, 1, 1);

        System.out.println(DateFormat.getDateTimeInstance(

            DateFormat.LONG, DateFormat.LONG).format(calendar.getTime()));


        SimpleTimeZone simpleTimeZone = new SimpleTimeZone(

                -21600000,

                     "CST",

                     Calendar.MARCH, 1, -Calendar.SUNDAY,

                     7200000,