Question

这可能很容易，但我尝试了方框中的每个技巧，但找不到解决方案。经历了很多教程。

问题：你有两个月了。但是对于要求，开始日应该是星期一，返回日期应该是星期日。我被要求使用以下模式编写函数。

写一个函数 int solution（int year，String startMonth，String endMonth，String firstDayOfYear）

所以调用方法如下： int解决方案（2014年，“五月”，“六月”，“星期三”）

因此，例如2014年4月1日至2014年5月31日，它应该在2014年4月7日至2014年5月25日之间返回，因此需要7周。

我被要求不使用日历API！

有谁可以帮我解决这个问题？我在下面写了下面的样本代码：

package holidayplanner4;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 *
 * @author kanirmal
 */
public class HolidayPlanner4 {

    /**
     * @param args the command line arguments
     */
    public static int solution(int year, String startMonth, String endMonth, String firstDayOfYear)
    {
        //String date1 = ""   
        SimpleDateFormat solFormat = new SimpleDateFormat("dd MMM yyyy");
        String datestartMonth = 01+" "+startMonth+" "+year;
        String dateendMonth = 31+" "+endMonth+" "+year;
        System.out.println("Start Day:"+datestartMonth+"\tEnd Day:"+dateendMonth);
        int daysBetween = 0;
        try
        {
               Date dateBefore = solFormat.parse(datestartMonth);
           Date dateAfter = solFormat.parse(dateendMonth);
           long difference = dateAfter.getTime() - dateBefore.getTime();
               System.out.println("Start Date:"+dateBefore+"\tEnd Date:"+dateAfter);
           daysBetween = (int) (difference / (1000*60*60*24));
               //daysBetween = daysBetween/7;
               /* one can also convert the milliseconds to days using below method
                * float daysBetween = 
                *         TimeUnit.DAYS.convert(difference, TimeUnit.MILLISECONDS)
                */
          // System.out.println("Number of Days between dates: "+daysBetween);
        }
        catch(ParseException e)
        {
            System.out.println("Exception caught:"+e);
        }
        return daysBetween;
    }
    public static void main(String[] args) 
    {
        // TODO code application logic here
        int year = 2014;
        int no_of_weeks = 0;
        String start_month = "May";
        String end_month = "June";
        String firstDayOfYear = "Wednesday";
        no_of_weeks = solution(year,start_month,end_month,firstDayOfYear);
        System.out.println("Total number of weeks spent during the 
    vacation:"+no_of_weeks);
    }

}

Answer 1

我得到了一位同事的帮助。我们尚未获得实际所需的输出，但我们接近解决方案，因此我将其标记为接近。请在下面找到我的最终代码。

import java.util.ArrayList;
import java.util.HashMap;

/**
 *
 * @author kanirmal
 */
public class HolidayPlanner {

    public static boolean leapYear(int year) {
        boolean leap = false;
        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0) {
                    leap = true;
                } else {
                    leap = false;
                }

            } else {
                leap = true;
            }

        } else {
            leap = false;
        }
        return leap;
    }

    public static int solution(int year, String startMonth, String endMonth,
            String firstDayOfYear) {

        ArrayList<String> days = new ArrayList<>();
        days.add("mon");
        days.add("twe");
        days.add("wed");
        days.add("thu");
        days.add("fri");
        days.add("sat");
        days.add("sun");

        ArrayList<String> month = new ArrayList<>();

        month.add("january");
        month.add("february");
        month.add("march");
        month.add("april");
        month.add("may");
        month.add("june");
        month.add("july");
        month.add("august");
        month.add("september");
        month.add("october");
        month.add("november");
        month.add("december");

        HashMap<String, Integer> mapMonth = new HashMap<>();
        mapMonth.put("january", 31);
        if (leapYear(year)) {
            mapMonth.put("february", 29);
        } else {
            mapMonth.put("february", 28);
        }
        mapMonth.put("march", 31);
        mapMonth.put("april", 30);
        mapMonth.put("may", 31);
        mapMonth.put("june", 30);
        mapMonth.put("july", 31);
        mapMonth.put("august", 31);
        mapMonth.put("september", 30);
        mapMonth.put("october", 31);
        mapMonth.put("november", 30);
        mapMonth.put("december", 31);

        int startMonthDays = 0;

        for (int i = 0; i <= month.indexOf(startMonth); i++) {
            startMonthDays += mapMonth.get(month.get(i));
        }

        int endMonthDays = 0;

        for (int i = 0; i <= month.indexOf(endMonth); i++) {
            endMonthDays += mapMonth.get(month.get(i));
        }

        int startDayNo = ((days.indexOf(firstDayOfYear) - 1) + ((startMonthDays % 7) - 1)) % 7;

        int endDayNo = ((days.indexOf(firstDayOfYear) - 1) + ((endMonthDays % 7) - 1) + mapMonth.get(endMonth)) % 7;

        int totalLeaveDays = mapMonth.get(startMonth)
                + (endMonthDays - startMonthDays);

        if (startDayNo != 0) {
            totalLeaveDays = totalLeaveDays - startDayNo;
        }

        if (endDayNo != 6) {
            totalLeaveDays = totalLeaveDays - endDayNo;
        }

        int totalWeek = totalLeaveDays / 7;

        return totalWeek;
    }
    public static void main(String args[])
    {
        int year = 2018;
        int no_of_weeks = 0;
        String start_month = "may";
        String end_month = "june";
        String firstDayOfYear = "mon";
        no_of_weeks = solution(year,start_month,end_month,firstDayOfYear);
        System.out.println("Total number of weeks spent during the vacation:"+no_of_weeks);
        System.out.println("solution::" + solution(2014, "may", "june", "wed"));

    }
}

Java代码返回两个月之间的总周数，其中开始日为月的第一个星期一，而结束日为上周日

1 个答案: