Calendar小应用--取得某月所有周五周六周天的日期

import java.text.ParseException;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class GetSomeDate {

    public static void main(String[] args) throws ParseException {
        int year = 2018;
        int month = 10;//月份从0开始,10代表11月份
        Calendar calendar = new GregorianCalendar(year, month, 1);
        int i = 1;
        while (calendar.get(Calendar.MONTH) < month + 1) {
            calendar.set(Calendar.WEEK_OF_YEAR, i++);
            calendar.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
            if (calendar.get(Calendar.MONTH) == month) {
                System.out.printf("星期五：%tF%n", calendar);
            }
            calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
            if (calendar.get(Calendar.MONTH) == month) {
                System.out.printf("星期天：%tF%n", calendar);
            }
            calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
            if (calendar.get(Calendar.MONTH) == month) {
                System.out.printf("星期六：%tF%n", calendar);
            }
        }
    }
}