用java的Switch语句输入一个年份和一个月份，判断该年该月有多少天

您好，根据您的输入，我可以回答您的问题。以下是代码示例：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入年份：");
        int year = input.nextInt();
        System.out.print("请输入月份：");
        int month = input.nextInt();
        int days = 0;
        switch (month) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                days = 31;
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                days = 30;
                break;
            case 2:
                if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                    days = 29;
                } else {
                    days = 28;
                }
                break;
            default:
                System.out.println("输入的月份不合法！");
                return;
        }
        System.out.println(year + "年" + month + "月有" + days + "天。");
    }
}

希望能够帮到您！