通过输入的年份和月份输出对应的日历

public static void main(String[] args) { Scanner input = new Scanner(System.in); while (true) { System.out.print("Enter full year (e.g., 2001): "); int year = input.nextInt(); System.out.print("Enter month as number between 1 and 12: "); int month = input.nextInt(); printMonth(year, month); System.out.println(" ------------------------------"); System.out.println(); } } public static void printMonth(int year, int month) { printMonthTitle(year, month); printMonthBody(year, month); } public static void printMonthTitle(int year, int month) { System.out.println(" " + getMonthName(month) + " " + year); System.out.println("----------------------------------"); System.out.println(" Sun Mon Tue Wed Thu Fri Sat"); } public static void printMonthBody(int year, int month) { int startDay = getStartDay(year, month); int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month); int i = 0; for (i = 0; i < startDay; i++) { System.out.print(" "); }

for (i = 1; i <= numberOfDaysInMonth; i++) { System.out.printf("%4d", i); if ((i + startDay) % 7 == 0) { System.out.println(); } } } public static String getMonthName(int month) { String monthName = ""; switch (month) { case 1: monthName = "January"; break; case 2: monthName = "February"; break; case 3: monthName = "March"; break; case 4: monthName = "April"; break; case 5: monthName = "May"; break; case 6: monthName = "June"; break; case 7: monthName = "July"; break; case 8: monthName = "August"; break; case 9: monthName = "September"; break; case 10: monthName = "October"; break; case 11: monthName = "November"; break; case 12: monthName = "December"; break; } return monthName; } public static int getStartDay(int year, int month) { final int START_DAY_FOR_JAN_1800 = 3; int totalNumberOfDays = getTotalNumberOfDays(year, month); return (totalNumberOfDays + START_DAY_FOR_JAN_1800) % 7; } public static int getTotalNumberOfDays(int year, int month) { int total = 0; for (int i = 1800; i < year; i++) { if (isLeapYear(i)) { total += 366; } else { total += 365; } } for (int i = 1; i < month; i++) { total += getNumberOfDaysInMonth(year, i); } return total; } public static int getNumberOfDaysInMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return 31; } if (month == 4 || month == 6 || month == 9 || month == 11) { return 30; } if (month == 2) { return isLeapYear(year) ? 29 : 28; } return 0; } public static boolean isLeapYear(int year) { return (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)); }

上述代码通过Java实现了通过输入年份和月份输出对应的日历信息。代码上传之后就变得不是很规范了。