写一个可以查询年月日多少天的Java代码

import java.time.LocalDate; import java.time.format.DateTimeFormatter;

public class DayCounter {

public static void main(String[] args) {
    String dateInput = "2021-05-12"; // 日期输入格式为 yyyy-MM-dd
    LocalDate date = LocalDate.parse(dateInput, DateTimeFormatter.ISO_LOCAL_DATE);
    int days = date.lengthOfMonth();
    System.out.println("该月的天数为：" + days);
}

}