package cn.edu.bjut.chapter3;

public class Date {
	private int year, month, day; 
	
	public Date(int year, int month, int day) {
		this.year = year; 
		this.month = month; 
		this.day = day; 
	}

	public int getYear() {
		return year;
	}

	public void setYear(int year) {
		this.year = year;
	}

	public int getMonth() {
		return month;
	}

	public void setMonth(int month) {
		this.month = month;
	}

	public int getDay() {
		return day;
	}

	public void setDay(int day) {
		this.day = day;
	}

	@Override
	public String toString() {
		return year + "-" + month + "-" + day;
	}
	
	public int daysInMonth() {
		switch (month) {
		case 1: 
		case 3: 
		case 5: 
		case 7: 
		case 8:
		case 10: 
		case 12: 
			return 31; //大月
		case 4: 
		case 6: 
		case 9: 
		case 11: 
			return 30; //小月
		default: // 2月
			if (((year % 100 != 0) && (year % 4 == 0)) 
					|| (year % 400 == 0)) {
				return 29; 
			} 
			
			return 28; 
		}
	}
	
	public Date tomorrow() {
		int tomorrowYear = year, tomorrowMonth = month, tomorrowDay = day; 
		
		if (day == daysInMonth()) {
			tomorrowDay = 1; 
			tomorrowMonth++; 
			
			if (month == 12) {
				tomorrowMonth = 1; 
				tomorrowYear++; 
			}
		} else {
			tomorrowDay++; 
		}
		
		return (new Date(tomorrowYear, tomorrowMonth, tomorrowDay)); 
	}
	
	public static void main(String[] args) {
		Date date = new Date(2017, 9, 30); 
		System.out.println("The number of days: " + date.daysInMonth());
		System.out.println(date + "\n" + date.tomorrow());
		
		Date date2 = new Date(2016, 2, 28); 
		System.out.println("The number of days: " + date2.daysInMonth());
		System.out.println(date2 + "\n" + date2.tomorrow());
	}
}