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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.time.*;
  5.  
  6. /* Name of the class has to be "Main" only if the class is public. */
  7. class Ideone
  8. {
  9.     public static void main(String[] args) throws Exception {
  10.         int year = -1, month = -1;
  11.  
  12.         if (args.length == 2) {
  13.             year = Integer.parseInt(args[0]);
  14.             month = Integer.parseInt(args[1]);
  15.         } else {
  16.             Scanner sc = new Scanner(System.in);
  17.             year = sc.nextInt();
  18.             month = sc.nextInt();
  19.         }
  20.  
  21.         LocalDate  d = LocalDate.of(year, month, 1);
  22.         int  wn = d.getDayOfWeek().getValue() % 7;
  23.         int  lm = d.lengthOfMonth();
  24.  
  25.         System.out.println(year + " 年 " + month + " 月");
  26.         System.out.println("日 月 火 水 木 金 土");
  27.  
  28.         if (wn > 0) {
  29.             for (int i = 0; i < wn; i++)
  30.                 System.out.print("   ");
  31.         }
  32.  
  33.         for (int i = 1; i <= lm; i++) {
  34.             System.out.printf("%2d", i);
  35.             wn++;
  36.             if (wn >= 7 || i == lm) {
  37.                 System.out.println();
  38.                 wn = 0;
  39.             } else {
  40.                 System.out.print(' ');
  41.             }
  42.         }
  43.     }
  44. }
Success #stdin #stdout 0.27s 34896KB
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stdin
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2018 5
stdout
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2018 年 5 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 30 31
https://ideone.com/ujLA0Y
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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