13. date1 - (5) DateDemo5 (기념일 계산기)

package date1;
 
import java.util.Date;
import java.util.Scanner;
import java.text.ParseException;
import java.text.SimpleDateFormat;
 
public class DateDemo5 {
    
    public static void main(String[] args) throws ParseException {
        
        // 기념일 계산기
        Date today = new Date();
        SimpleDateFormat df = new SimpleDateFormat("yyyy.M.d");
        Scanner sc = new Scanner(System.in);
        
        System.out.println("ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ");
        System.out.println("1.며칠째 날?     2.그날은 몇일까?");
        System.out.println("ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ");
        
        System.out.print("메뉴를 선택하세요 : ");
        int menuNo = sc.nextInt();
        
        if(menuNo == 1) {
            System.out.print("기념일을 입력하세요 : (입력예 : 2001.4.2");
            String text = sc.next();
            int ONE_DATE_TIME = sc.nextInt();
            Date memorialDay = df.parse(text);
            
            long todayTime = today.getTime();
            long memoriaDayTime = memorialDay.getTime();
            
            long dayCount = (todayTime - memoriaDayTime) / ONE_DATE_TIME;
            System.out.println("오늘은" + dayCount + "(일째 날입니다)");
            
        } else if (menuNo == 2) {
            System.out.println("날짜를 입력하세요 (입력예 : 100) : ");
            int dayCount = sc.nextInt();
            int ONE_DATE_TIME = sc.nextInt();
            
            long todayTime = today.getTime();
            long dayTime = ONE_DATE_TIME * dayCount;
            
            Date futureDay = new Date(todayTime + dayTime);
            String text = df.format(futureDay);
            System.out.println("오늘부터 [" + dayCount +"] 일째는 " + text + " 입니다.");
            
            
        }
        
    }
}