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("\n------------------------------");

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。