应用GregorianCalendar类的日历程序

应用GregorianCalendar类的日历程序。这个程序将显示当前月的日历，其格式为：

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源码如下：

import java.text.DateFormatSymbols;import java.util.*;/** *  * @author admin * */public class CalendarTest{   public static void main(String[] args)   {      // construct d as current date      GregorianCalendar d = new GregorianCalendar();      int today = d.get(Calendar.DAY_OF_MONTH);      int month = d.get(Calendar.MONTH);      // set d to start date of the month      d.set(Calendar.DAY_OF_MONTH, 1);      int weekday = d.get(Calendar.DAY_OF_WEEK);      // get first day of week (Sunday in the China)      int firstDayOfWeek = d.getFirstDayOfWeek();      // determine the required indentation for the first line      int indent = 0;      while (weekday != firstDayOfWeek)      {         indent++;         d.add(Calendar.DAY_OF_MONTH, -1);         weekday = d.get(Calendar.DAY_OF_WEEK);      }      // print weekday names      String[] weekdayNames = new DateFormatSymbols().getShortWeekdays();      do      {         System.out.printf("%4s", weekdayNames[weekday]);         d.add(Calendar.DAY_OF_MONTH, 1);         weekday = d.get(Calendar.DAY_OF_WEEK);      }      while (weekday != firstDayOfWeek);      System.out.println();      for (int i = 1; i <= indent; i++)         System.out.print("     ");      d.set(Calendar.DAY_OF_MONTH, 1);      do      {         // print day         int day = d.get(Calendar.DAY_OF_MONTH);         System.out.printf("%4d", day);         // mark current day with *         if (day == today) System.out.print("*");         else System.out.print(" ");         // advance d to the next day         d.add(Calendar.DAY_OF_MONTH, 1);         weekday = d.get(Calendar.DAY_OF_WEEK);         // start a new line at the start of the week         if (weekday == firstDayOfWeek) System.out.println();      }      while (d.get(Calendar.MONTH) == month);      // the loop exits when d is day 1 of the next month      // print final end of line if necessary      if (weekday != firstDayOfWeek) System.out.println();   }}