java get week

java gets the week

1. First create a getWeek function that receives a Date type parameter;

2. Then create a GregorianCalendar instance within the function;

3. Then set the time of the GregorianCalendar instance as the received parameter;

4. Finally, use get Just get the week number.

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class GetWeek {
    /** * @param args */
    public static void main(String[] args) {
        System.out.println(getWeek(new Date()));
    }
    public static int getWeek(Date date) {
        GregorianCalendar g = new GregorianCalendar();
        g.setTime(date);
        return g.get(Calendar.WEEK_OF_YEAR); //获得周数 
    } 
}

Supplement:

The Calendar class implements the Gregorian calendar, and GregorianCalendar is a specific implementation of the Calendar class.

Calendar’s getInstance() method returns a GregorianCalendar object initialized by default with the current locale and time zone.

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