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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class CalendarPrinter
  8. {
  9.     private boolean IsUruu(int year)
  10.     {
  11.         if (year % 400 == 0) {
  12.             return true;
  13.         }
  14.         if (year % 100 == 0) {
  15.             return false;
  16.         }
  17.         if (year % 4 == 0) {
  18.             return true;
  19.         }
  20.         return false;
  21.     }
  22.  
  23.     // 引数の年の1月1日の曜日を取得する(日曜なら0)
  24.     private int GetYearStartDay(int year)
  25.     {
  26.         if(year <= 1)
  27.         {
  28.             return 0;
  29.         }
  30.         int yearDayCount = 365;
  31.         if(IsUruu(year))
  32.         {
  33.             ++yearDayCount;
  34.         }
  35.         return (GetYearStartDay(year-1) + yearDayCount) % 7;
  36.     }
  37.  
  38.     private int GetDayCount(int year, int month)
  39.     {
  40.         if(month == 2)
  41.         {
  42.             return IsUruu(year) ? 29 : 28;
  43.         }
  44.         if(month == 2 ||
  45.            month == 4 ||
  46.            month == 6 ||
  47.            month == 9 ||
  48.            month == 11)
  49.         {
  50.         	return 30;
  51.         }
  52.         if(month == 1 ||
  53.            month == 3 ||
  54.            month == 5 ||
  55.            month == 7 ||
  56.            month == 8 ||
  57.            month == 10 ||
  58.            month == 12)
  59.         {
  60.         	return 31;
  61.         }
  62.         assert false : "month is invalid (" + month +")";
  63.         return 0;
  64.     }
  65.  
  66.     // 引数の年月の1日の曜日を取得する(日曜なら0)
  67.     private int GetMonthStartDay(int year, int month, int yearStartDay)
  68.     {
  69.         int dayCountSum = 0;
  70.         for(int i=1; i<month; ++i)
  71.         {
  72.             dayCountSum += GetDayCount(year, i);
  73.         }
  74.         return (yearStartDay + dayCountSum) % 7;
  75.     }
  76.  
  77.     public void Print(int year, int month)
  78.     {
  79.         int yearStartDay = GetYearStartDay(year);
  80.         int monthStartDay = GetMonthStartDay(year, month, yearStartDay);
  81.  
  82.         // 「カレンダーの表示を開始します」みたいな、
  83.         // コードを見たらすぐわかるコメントは不要
  84.         System.out.println("     " + year + "年 " + month + "月");
  85.         System.out.println("日 月 火 水 木 金 土");
  86.  
  87.         for (int i = 0; i < monthStartDay; ++i)
  88.         {
  89.             System.out.print("   ");
  90.         }
  91.         int printingDay = monthStartDay;
  92.         int monthDayCount = GetDayCount(year, month);
  93.         for (int i = 1; i <= monthDayCount; ++i)
  94.         {
  95.             System.out.print(String.format("%2d ", i));
  96.             ++printingDay;
  97.             if(printingDay %7 == 0)
  98.             {
  99.                 System.out.println("");
  100.             }
  101.         }
  102.         System.out.println("");
  103.     }
  104. }
  105.  
  106. class YearMonthLoader
  107. {
  108.     public int year;
  109.     public int month;
  110.     private boolean isYearInputed;
  111.     private boolean isMonthInputed;
  112.     private Scanner scanner;
  113.  
  114.     final private int YearMin = 2000;
  115.     final private int YearMax = 2040;
  116.  
  117.     YearMonthLoader()
  118.     {
  119.         scanner = new Scanner(System.in);
  120.     }
  121.     public boolean IsValidYear(int num)
  122.     {
  123.         return num >= YearMin && num <= YearMax;
  124.     }
  125.     public boolean IsValidMonth(int num)
  126.     {
  127.         return num >= 1 && num <= 12;	
  128.     }
  129.     public void Load()
  130.     {
  131.         isYearInputed = false;
  132.         isMonthInputed = false;
  133.         while(true)
  134.         {
  135.         	String inputStr = scanner.nextLine();
  136.             try
  137.             {
  138.                 int input = Integer.parseInt(inputStr);
  139.                 if(!isYearInputed && IsValidYear(input))
  140.                 {
  141.                     year = input;
  142.                     isYearInputed = true;
  143.                     continue;
  144.                 }
  145.                 else if(isYearInputed && IsValidMonth(input))
  146.                 {
  147.                     month = input;
  148.                     isMonthInputed = true;
  149.                     return;
  150.                 }
  151.             }
  152.             catch(NumberFormatException e)
  153.             {
  154.             }
  155.             System.out.println("正しい入力ではありません。");
  156.         }
  157.     }
  158. }
  159.  
  160. class Calendar
  161. {
  162.     public static void main (String[] args)
  163.     {
  164.         YearMonthLoader loader = new YearMonthLoader();
  165.         loader.Load();
  166.         CalendarPrinter calendar = new CalendarPrinter();
  167.         calendar.Print(loader.year, loader.month);
  168.     }
  169. }
Success #stdin #stdout 0.14s 29636KB
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0
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a
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2016
2
stdout
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正しい入力ではありません。
正しい入力ではありません。
正しい入力ではありません。
正しい入力ではありません。
     2016年 2月
日 月 火 水 木 金 土
    1  2  3  4  5  6 
 7  8  9 10 11 12 13 
14 15 16 17 18 19 20 
21 22 23 24 25 26 27 
28 29
https://ideone.com/bLfLVt
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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