[객체(15)] 실습7, 실습8

💫 실습7

 

package com.kh.prac7.controller;

import java.util.Calendar;

public class DateCalculator {
	public long leapDate() {
		Calendar today = Calendar.getInstance();
		long sumDays=0L;
		for(int i=0;i<=today.get(Calendar.YEAR);i++) {//해가바뀜(년도가바뀜)
			if(i==today.get(Calendar.YEAR)) {//올해의 날짜만 계산
				for(int j=1;j<=(today.get(Calendar.MONTH)+1);j++) {//달이바뀜
					if(j==(today.get(Calendar.MONTH)+1)) {//이번달
						for(int n=1;n<=today.get(Calendar.DATE);n++)
						{
							sumDays+=1;
						}
					}
					else if(j==2) { //올해 1월부터 저번달까지
						if(isLeapYear(i)) sumDays+=29;
						else sumDays+=28;
					}
					else if(j==4||j==6||j==9||j==11) {
						sumDays+=30;
					}
					else sumDays+=31;
				}
			}
			else {//0년부터 작년까지
				if(isLeapYear(i)) sumDays+=366;
				else sumDays+=365;
			}
		}
		return sumDays;
		
	}
	public boolean isLeapYear(int year) {
		if(year%4==0 && (year%100!=0 || year%400 == 0)) return true;
		else return false;
	}
}

 

package com.kh.prac7.run;

import java.util.Calendar;

import com.kh.prac7.controller.DateCalculator;

public class Run {
	public static void main(String[] args) {
		DateCalculator cd = new DateCalculator();
		Calendar cal = Calendar.getInstance();
		if(cd.isLeapYear(cal.get(Calendar.YEAR)))
			System.out.println("올해는 윤년입니다.");
		else
			System.out.println("올해는 평년입니다.");
		System.out.println("0년 1월 1일부터 오늘까지 일수 : " + cd.leapDate());
	}
}

 

💫 실습8

 

package com.kh.prac8.run;

import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Run {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("날짜를 입력하시오(ex: 2022-05-16):");
		String str = sc.next();
		StringTokenizer st = new StringTokenizer(str, "-");
		
		int year = Integer.valueOf(st.nextToken()); //년도
		int month = Integer.valueOf(st.nextToken()); //월
		int day = Integer.valueOf(st.nextToken()); //일
		
		GregorianCalendar cl = new GregorianCalendar(year, month-1, day);
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd.E");
		System.out.println(sdf.format(cl.getTime()));
		
	}
}
/*
날짜를 입력하시오(ex: 2022-05-16):2022-05-16
2022.05.16.월
*/