用Java编写类 `MyDate` 具有属性年月日，要求一个构造函数初始化属性年月日，提供重置日期、增加日期(考虑闰年闰月)、输出日期等成员函数。

以下是 `MyDate` 类的实现：

public class MyDate {
    private int year;
    private int month;
    private int day;

    public MyDate(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public void resetDate(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public void addDays(int days) {
        int[] daysInMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        if (isLeapYear(year)) {
            daysInMonth[1] = 29;
        }

        while (days > 0) {
            int daysInCurrMonth = daysInMonth[month - 1];
            if (day + days > daysInCurrMonth) {
                days -= (daysInCurrMonth - day + 1);
                day = 1;
                month++;
                if (month > 12) {
                    month = 1;
                    year++;
                    if (isLeapYear(year)) {
                        daysInMonth[1] = 29;
                    } else {
                        daysInMonth[1] = 28;
                    }
                }
            } else {
                day += days;
                days = 0;
            }
        }
    }

    public void printDate() {
        System.out.println(year + "-" + month + "-" + day);
    }

    private boolean isLeapYear(int year) {
        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0) {
                    return true;
                } else {
                    return false;
                }
            } else {
                return true;
            }
        } else {
            return false;
        }
    }
}

使用示例：

public class Main {
    public static void main(String[] args) {
        MyDate date = new MyDate(2021, 7, 1);
        date.printDate(); // Output: 2021-7-1

        date.resetDate(2022, 1, 1);
        date.printDate(); // Output: 2022-1-1

        date.addDays(31);
        date.printDate(); // Output: 2022-2-1

        date.addDays(365);
        date.printDate(); // Output: 2023-2-1
    }
}