这一天是这一年的第几天

package Homework;

import java.util.Scanner;

public class J1_1_1 {

public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	System.out.println("请输入年份");
	int year = sc.nextInt();
	System.out.println("请输入月份");
	int month = sc.nextInt();
	System.out.println("请输入日份");
	int day = sc.nextInt();
	int days = 0;
	if (((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) && month > 2) 
		days += 1;
		switch (month - 1) {
		case 11:
			days += 30;
		case 10:
			days += 31;
		case 9:
			days += 30;
		case 8:
			days += 31;
		case 7:
			days += 31;
		case 6:
			days += 30;
		case 5:
			days += 31;
		case 4:
			days += 30;
		case 3:
			days += 31;
		case 2:
			days += 28;
		case 1:
			days += 31;
		}
		days = days + day;
		System.out.println("这是这一年的第" + days + "天");
		sc.close();
	}
}