Question

我已写完所有代码，但遗漏了一些东西。它的两个类一起工作以输出一周中的特定日期。我知道我做了一些愚蠢的错误，任何帮助都会受到赞赏

基本上，2个输出是正确的，2个是不正确的。两个不正确的是前一天和第二天，而不是得到正确的答案，我得到，比如，周一1或周二6：

import java.util.*;

public class DaysOfTheWeek
{

static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{

  String currentDayOfTheWeek;
  String dayOfTheWeek;

  int dayToFind;

  System.out.println("Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday");
  System.out.print("Enter a day of the week: ");

  currentDayOfTheWeek = console.nextLine();

  Day newDay = new Day(currentDayOfTheWeek);

  newDay.printTheDay();

  dayOfTheWeek = newDay.getThePreviousDay(currentDayOfTheWeek);

  System.out.println();
  System.out.print("The PREVIOUS day from '" + currentDayOfTheWeek + "' ");
  System.out.print("is '" + dayOfTheWeek + "' \n");

  dayOfTheWeek = newDay.getTheNextDay(currentDayOfTheWeek);

  System.out.println();
  System.out.print("The NEXT day from '" + currentDayOfTheWeek + "' ");
  System.out.print("is '" + dayOfTheWeek + "' \n");

  System.out.println();
  System.out.println("How many days in the future from '" + currentDayOfTheWeek +"' \n");
  System.out.print("Do you want (0 - 31)?: ");

  dayToFind = console.nextInt();

  if (validateDay(dayToFind) == true)
  {      
     dayOfTheWeek = newDay.getTheFutureDay(currentDayOfTheWeek, dayToFind);

     System.out.println();
     System.out.print(dayToFind + " days from '" + currentDayOfTheWeek + "' ");
     System.out.print("is '" + dayOfTheWeek + "' \n");                   
  }
  else {
     System.out.println();
     System.out.println("Invalid Day '" + dayToFind + "'. Entered day must be between 0 and 31");
  }
}

public static boolean validateDay(int dayToFind)
{
  boolean validDay;

  if ((dayToFind < 0) || (dayToFind > 31))
     validDay = false;
  else
     validDay = true;

  return validDay;
  }
  public class day {
  }
  }

对此课程进行了哪些调用：

public class Day
{
private String[] daysArray = {"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
private String dayOfTheWeek;

public Day()
{
  dayOfTheWeek = "";
}

public Day(String whichDay)
{
   setTheDay(whichDay);
}

public void setTheDay(String whichDay)
{
   dayOfTheWeek = whichDay;
}
public void printTheDay()
{
   System.out.println();
   System.out.println("Day of the week entered is: " + dayOfTheWeek);
}

public String getTheFutureDay(String currentDayString, int futureDay)
{     
   int todayArrayPos = -1;

   for (int i = 0; i < daysArray.length; i++)
   {
      if (daysArray[i].equalsIgnoreCase(currentDayString))
      {
         todayArrayPos = i;
         break;
      }
   }

   if (todayArrayPos == -1)
   {
      return "Invalid Day " + futureDay;
   }

   boolean bailOut = false;

   int newFutureDay = 0;
   int j = todayArrayPos;

   while (newFutureDay != futureDay)
   {
    while (j < daysArray.length)
    {
        if (newFutureDay == futureDay)
        {
           bailOut = true;
           break;
        }

        j += 1;
        newFutureDay += 1;
    }

    if (bailOut == true)
    {
        break;
    }

    j = 0;
  }

  return daysArray[j];          
}

public String getTheNextDay(String currentDayString)
{

  String nextDayString = (dayOfTheWeek) + 1;
return nextDayString;
 }

public String getThePreviousDay(String currentDayString)
{


  String previousDayString = (dayOfTheWeek) + 6;
return previousDayString;
}
}

任何帮助将不胜感激！提前致谢

标记

Answer 1

所以你的问题是你在第二天的方法中为一个字符串添加1。

public String getTheNextDay(String currentDayString)
{
  String nextDayString = (dayOfTheWeek) + 1;
  return nextDayString;
}

这将导致字符串连接 - 程序不明白当你要求它做“星期二”+ 1时你想要它说“星期三”。

你需要做一些与你未来的方法类似的事情：

int todayArrayPos = -1;
for (int i = 0; i < daysArray.length; i++)
{
 if (daysArray[i].equalsIgnoreCase(currentDayString))
 {
  todayArrayPos = i;
  break;
 }
}
int nextDayIndex = i + 1;
//roll over to the first day of the week if the old day was the last day of the week
if (nextDayIndex == daysArray.length) {
 nextDayIndex = 0;
}
return daysArray[nextDayIndex];

尝试前一天类似的事情。

JAVA：回答错误答案

1 个答案: