지정된 달에서 특정요일(수, 금 ,토)에 해당하는 날짜 받아오기
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Map;
public class TestMain {
public static void main(String args[]) throws ParseException{
// create a Calendar for the 1st of the required month
//int year = 2019;
//int month = Calendar.APRIL;
String date = "04/17/2019";
String pattern = "MM/dd/yyyy";
Date date1=new SimpleDateFormat(pattern).parse(date);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date1);
//System.out.println(date1);
int year = Calendar.getInstance().get(Calendar.YEAR);
int month = Calendar.getInstance().get(Calendar.MONTH); // +1?
Calendar cal = new GregorianCalendar(year, month, 1);
do {
// get the day of the week for the current day
int day = cal.get(Calendar.DAY_OF_WEEK);
// check if it is a Saturday or Sunday
if (day == Calendar.WEDNESDAY || day == Calendar.FRIDAY || day == Calendar.SATURDAY) {
// print the day - but you could add them to a list or whatever
//System.out.println(cal.get(Calendar.DAY_OF_MONTH));
System.out.println(simpleDateFormat.format(cal.getTime()));
}
// advance to the next day
cal.add(Calendar.DAY_OF_YEAR, 1);
} while (cal.get(Calendar.MONTH) == month);
// stop when we reach the start of the next month
}
}