用java代码写一个方法，逻辑为本年度第一天到第一个周日为第一周，本年度最后一个周一到最后一天为最后一周，返回计算总周数和输入第几周的日期范围

抱歉，我可以回答您的问题。下面是您需要的Java代码：

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class WeeksOfYear {
    public static void main(String[] args) {
        int totalWeeks = getTotalWeeksOfYear();
        System.out.println("本年度总共有" + totalWeeks + "周");

        LocalDate weekStart = getWeekStartByWeekNumber(5);
        LocalDate weekEnd = getWeekEndByWeekNumber(5);

        System.out.println("第5周的日期范围为" + weekStart + " 到 " + weekEnd);
    }

    public static int getTotalWeeksOfYear() {
        LocalDate firstDayOfYear = LocalDate.now().withDayOfYear(1);
        LocalDate firstSundayOfYear = firstDayOfYear.with(DayOfWeek.SUNDAY);

        LocalDate lastDayOfYear = firstDayOfYear.withDayOfYear(365).with(DayOfWeek.MONDAY);
        LocalDate lastSundayOfYear = lastDayOfYear.minusDays(1);

        long daysBetween = ChronoUnit.DAYS.between(firstSundayOfYear, lastSundayOfYear);
        int totalWeeks = (int) ((daysBetween / 7) + 1);
        return totalWeeks;
    }

    public static LocalDate getWeekStartByWeekNumber(int weekNumber) {
        LocalDate firstDayOfYear = LocalDate.now().withDayOfYear(1);
        LocalDate firstSundayOfYear = firstDayOfYear.with(DayOfWeek.SUNDAY);

        LocalDate weekStart = firstSundayOfYear.plusWeeks(weekNumber - 1);
        return weekStart;
    }

    public static LocalDate getWeekEndByWeekNumber(int weekNumber) {
        LocalDate firstDayOfYear = LocalDate.now().withDayOfYear(1);
        LocalDate firstSundayOfYear = firstDayOfYear.with(DayOfWeek.SUNDAY);

        LocalDate weekEnd = firstSundayOfYear.plusWeeks(weekNumber).minusDays(1);
        return weekEnd;
    }
}

该方法 getTotalWeeksOfYear() 返回本年度总共的周数，getWeekStartByWeekNumber(int weekNumber) 和 getWeekEndByWeekNumber(int weekNumber) 方法可以分别计算第几周的起始和结束日期范围。