显示日历

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编写程序，提示用户输入年份和该年第一天的星期，在控制台上显示该年的日历
表。例如，用户输入2010年，第一天是星期5，则显示如下的日历：
import javax.swing.*;public class Date {    public static void main(String[] args) {        String yearString = JOptionPane.showInputDialog("Enter a year:");        int year = Integer.parseInt(yearString);        String firstDayString = JOptionPane.showInputDialog("Enter the first day of the year:");        int firstDay = Integer.parseInt(firstDayString);        int startDay = firstDay;        int numberOfDaysInMonth = 0;        // Display calendar for each month        for (int month = 1; month <= 12; month++) {            // Display Calendar title            System.out.print("          ");            switch (month) {  case 1: System.out.println("January " + year);                numberOfDaysInMonth = 31;                break;   case 2: System.out.println("Feburary " + year);   if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))                    numberOfDaysInMonth = 29;        else                    numberOfDaysInMonth = 28;                break;     case 3: System.out.println("March " + year);                numberOfDaysInMonth = 31;                break;      case 4: System.out.println("April " + year);                numberOfDaysInMonth = 30;                break;      case 5: System.out.println("May " + year);                numberOfDaysInMonth = 31;                break;      case 6: System.out.println("June " + year);                numberOfDaysInMonth = 30;                break;       case 7: System.out.println("July " + year);                numberOfDaysInMonth = 31;                break;        case 8: System.out.println("August " + year);                numberOfDaysInMonth = 31;                break;        case 9: System.out.println("September " + year);                numberOfDaysInMonth = 30;                break;         case 10: System.out.println("October " + year);                numberOfDaysInMonth = 31;                break;        case 11: System.out.println("November " + year);                numberOfDaysInMonth = 30;                break;        case 12: System.out.println("December " + year);                numberOfDaysInMonth = 31;                break;            }     System.out.println("-----------------------------");            System.out.println(" Sun Mon Tue Wed Thu Fri Sat");            // Pad space before the first day of the month            int i = 0;            for (i = 0; i < startDay; i++)                System.out.print("    ");            for (i = 1; i <= numberOfDaysInMonth; i++) {                if (i < 10)                    System.out.print("   " + i);                else                    System.out.print("  " + i);                if ((i + startDay) % 7 == 0)                    System.out.println();            }            System.out.println();            System.out.println();            // Get the start day for the next month         startDay = (startDay + numberOfDaysInMonth) % 7;        }    }}
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