在树莓派上用yolov7训练图像识别模型

使用if语句：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入年月(格式为yyyy-MM)：");
        String input = scanner.nextLine();
        int year = Integer.parseInt(input.substring(0, 4));
        int month = Integer.parseInt(input.substring(5));
        int days = 0;
        if (month == 2) {
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                days = 29;
            } else {
                days = 28;
            }
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            days = 30;
        } else {
            days = 31;
        }
        System.out.println(year + "年" + month + "月有" + days + "天");
    }
}

使用switch语句：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入年月(格式为yyyy-MM)：");
        String input = scanner.nextLine();
        int year = Integer.parseInt(input.substring(0, 4));
        int month = Integer.parseInt(input.substring(5));
        int days = 0;
        switch (month) {
            case 2:
                if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                    days = 29;
                } else {
                    days = 28;
                }
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                days = 30;
                break;
            default:
                days = 31;
                break;
        }
        System.out.println(year + "年" + month + "月有" + days + "天");
    }
}