用Java的switch语句写一个输入2023年的月“month”和日“day”两个参数，计算出该日期为2023年的第几天，并打印输出“month月day日是2023年第x天”。

A：

import java.util.Scanner;

public class DayOfYear {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int month = sc.nextInt();
        int day = sc.nextInt();
        sc.close();

        int dayOfYear = 0;
        switch (month) {
            case 1:
                dayOfYear = day;
                break;
            case 2:
                dayOfYear = 31 + day;
                break;
            case 3:
                dayOfYear = 59 + day;
                break;
            case 4:
                dayOfYear = 90 + day;
                break;
            case 5:
                dayOfYear = 120 + day;
                break;
            case 6:
                dayOfYear = 151 + day;
                break;
            case 7:
                dayOfYear = 181 + day;
                break;
            case 8:
                dayOfYear = 212 + day;
                break;
            case 9:
                dayOfYear = 243 + day;
                break;
            case 10:
                dayOfYear = 273 + day;
                break;
            case 11:
                dayOfYear = 304 + day;
                break;
            case 12:
                dayOfYear = 334 + day;
                break;
            default:
                System.out.println("输入无效的月份！");
                return;
        }

        System.out.println(month + "月" + day + "日是2023年第" + dayOfYear + "天");
    }
}