yeardisplay.java

21天学会java的源代码 它让你轻松学会java 编程 让你轻松成为一个java 程序员

class YearDisplay {
    public static void main(String[] arguments) {
        int year = 2000;
        if (arguments.length > 0)
            year = Integer.parseInt(arguments[0]);
        for (int month = 1; month < 13; month++)
            for (int day = 1; day <= countDays(month, year); day++)
                System.out.println(month + "/" + day + "/" + year);
    }

    static int countDays(int month, int year) {
        int count = -1;
        switch (month) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                count = 31;
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                count = 30;
                break;
            case 2:
                if (year % 4 == 0)
                    count = 29;
                else
                    count = 28;
                if ((year % 100 == 0) & (year % 400 != 0))
                    count = 28;
        }
        return count;
    }
}