如何在控制台中打印日历月份？

Question

我有一个任务需要创建一个Java控制台应用程序，它涉及到要求用户输入日期，解析该日期以及确定该日期从哪一天开始。我必须再打印出的日历，看起来像这样：

Calendar for September 2016 
Su Mo Tu We Th Fr Sa 
- - - - 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 - 

我有约会，我有一天数的日期开始日（如天= 1（星期一），天= 2（星期二）等）

现在，我可以使用一个非常凌乱的外观if语句的嵌套if语句，根据Day的值和当月天数打印出这个pre自制的日历，我可以预先为每个日期和当月的天数组合预先制作一个日历。但我不想那样做，我也找不到一个更简单的方法。有没有人有过更简洁，更简洁的方法？会涉及二维数组吗？

PS。我不被允许使用Java中的任何基于日期的库类。

Answer 1

好，你可以，如果你改变主意

public static void main(String args []) 
    { 

     // type MM yyyy 
     Scanner in = new Scanner(System.in); 
     System.out.print("Enter month and year: MM yyyy "); 
     int month = in.nextInt(); 
     int year = in.nextInt(); 
     in.close(); 
     // checks valid month 
     try { 

      if (month < 1 || month > 12) 
       throw new Exception("Invalid index for month: " + month); 
      printCalendarMonthYear(month, year);} 

     catch (Exception e) { 
      System.err.println(e.getMessage()); 
     } 
    } 

    private static void printCalendarMonthYear(int month, int year) { 
     Calendar cal = new GregorianCalendar(); 
     cal.clear(); 
     cal.set(year, month - 1, 1); // setting the calendar to the month and year provided as parameters 
     System.out.println("Calendar for "+ cal.getDisplayName(Calendar.MONTH, Calendar.LONG, 
         Locale.US) + " " + cal.get(Calendar.YEAR));//to print Calendar for month and year 
     int firstWeekdayOfMonth = cal.get(Calendar.DAY_OF_WEEK);//which weekday was the first in month 
     int numberOfMonthDays = cal.getActualMaximum(Calendar.DAY_OF_MONTH); //lengh of days in a month 
     printCalendar(numberOfMonthDays, firstWeekdayOfMonth); 
    } 
    private static void printCalendar(int numberOfMonthDays, int firstWeekdayOfMonth) { 
     int weekdayIndex = 0; 
     System.out.println("Su MO Tu We Th Fr Sa"); // The order of days depends on your calendar 

     for (int day = 1; day < firstWeekdayOfMonth; day++) { 
      System.out.print(" "); //this loop to print the first day in his correct place 
      weekdayIndex++; 
     } 
     for (int day = 1; day <= numberOfMonthDays; day++) { 

      if (day<10) // this is just for better visialising because unit number take less space of course than 2 
      System.out.print(day+" "); 
      else System.out.print(day); 
      weekdayIndex++; 
      if (weekdayIndex == 7) { 
       weekdayIndex = 0; 
       System.out.println(); 
      } else { 
       System.out.print(" "); 
      }}}