题解 | #计算日期到天数转换#

import java.util.Calendar;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        int y = in.nextInt();
        int m = in.nextInt();
        int d = in.nextInt();
        Calendar c1 = Calendar.getInstance(); //实例化
        c1.set(y, m - 1, d); //注意月份从0开始
        System.out.println(c1.get(Calendar.DAY_OF_YEAR));
    }

}