Calender_달력

import java.util.Calendar;

public class Main {

	public static void main(String[] args) {

		Calendar cal = Calendar.getInstance();  //2020 08 12
		int year = cal.get(Calendar.YEAR);
		int month = cal.get(Calendar.MONTH);  // 0 - 1월달, 11 - 12월달
		int day = cal.get(Calendar.DATE);
		int dow = cal.get(Calendar.DAY_OF_WEEK);  // 1 - 일요일, 2 - 월요일 7 - 토요일
		int max = cal.getActualMaximum(Calendar.DATE); 		
		
		cal.add(Calendar.MONTH, -1);  // 2020 07 12
		cal.add(Calendar.MONTH, 2);  // 2020 09 12
		cal.set(Calendar.YEAR, 2000); // 2000 09 12
		
		for (int i = 0; i < 20; i++) {
			if(i % 3 ==0 ) {
				System.out.println(i);
			}
		}
		
		System.out.println(year + " - " + (month+1) + " - "+day);
	}

}