class Date {
    int year, month, day;
}

class Foo {
    public static void main (String[] args) {
    	Date d1 = new Date();
    	d1.year = 1999; d1.month = 12; d1.day = 31;	
    	System.out.println(is_correct_day(d1));

    	Date d2 = new Date();
    	d2.year = 2000; d2.month = 1; d2.day = 33;	
    	System.out.println(is_correct_day(d2));

    	Date d3 = new Date();
    	d3.year = 2000; d3.month = 2; d3.day = 29;	
    	System.out.println(is_correct_day(d3));
    }

    public static boolean is_correct_day (Date d) {
    	// 各月の最大日(max_day[0]は使わない)
    	int[] max_day = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    	if ((d.year%4==0 && d.year%100!=0) || (d.year%400==0)) {
    	    max_day[2] = 29; // うるう年の2月は29日まである
    	}

	return (1<=d.month && d.month<=12)
    	       && (1<=d.day && d.day<=max_day[d.month]);
    }
}

/* 3章の内容を使うと，is_correct_day をstaticでないメソッドとして
   定義できる．こちらの方がJava のプログラムとして自然．          */
/*
class Date {
    int year, month, day;

    public boolean is_correct_day () {
    	int[] max_day = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    	if ((year%4==0 && year%100!=0) || (year%400==0)) {
    	    max_day[2] = 29;
    	}

	return (1<=month && month<=12) && (1<=day && day<=max_day[month]);
    }

    public static void main (String[] args) {
    	Date d1 = new Date();
    	d1.year = 1999; d1.month = 12; d1.day = 31;	
    	System.out.println(d1.is_correct_day());

    	Date d2 = new Date();
    	d2.year = 2000; d2.month = 1; d2.day = 33;	
    	System.out.println(d2.is_correct_day());

    	Date d3 = new Date();
    	d3.year = 2000; d3.month = 2; d3.day = 29;	
    	System.out.println(d3.is_correct_day());
    }
}
*/