Question

我有一个I类课程，我必须制作一个Java控制台应用程序，它涉及要求用户提供日期，解析该日期，以及确定该月的哪一天日期开始。然后我必须打印出日历，如下所示：

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  -

我有日期，我有日期开始的日期，（例如，日= 1（星期一），日= 2（星期二）等）

现在，我可以使用非常混乱的switch语句和嵌套的if语句，根据Day的值和当月的天数，打印出这个预制日历，我可以预先 - 为日期和该月份的天数的每个最终组合制作日历。但我不想这样做，我无法找到一种更简单的方法。有没有人有任何更简洁，更简洁的方法呢？它会涉及二维阵列吗？

PS。我不允许使用Java中提供的任何基于日期的库类。

Answer 1

如果你改变主意，你可以使用它

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("  ");
            }}}

如何在控制台中打印日历月？

1 个答案: