题解 | #计算日期到天数转换#

用Calendar类

import java.util.Scanner;

public class Main {
    //HJ73 计算日期到天数转换
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int y =sc.nextInt();
        int m =sc.nextInt();
        int d = sc.nextInt();
        Calendar calendar = Calendar.getInstance();
        //.set()方法中 month 范围为0-11 对应1-12月
        calendar.set(y,m-1,d);
        System.out.println(calendar.get(Calendar.DAY_OF_YEAR));
    }
}