calendartest.java

来自「经典教材：java核心技术卷1、卷2的所有源代码」· Java 代码 · 共 58 行

/**
   @version 1.31 2004-02-19
   @author Cay Horstmann
*/

import java.util.*;

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);

      // print heading
      System.out.println("Sun Mon Tue Wed Thu Fri Sat");

      // indent first line of calendar
      for (int i = Calendar.SUNDAY; i < weekday; i++ )
         System.out.print("    ");

      do
      {  
         // print day
         int day = d.get(Calendar.DAY_OF_MONTH);
         System.out.printf("%3d", day);

         // mark current day with *
         if (day == today)
            System.out.print("*");
         else
            System.out.print(" ");

         // start a new line after every Saturday
         if (weekday == Calendar.SATURDAY)
            System.out.println();

         // advance d to the next day
         d.add(Calendar.DAY_OF_MONTH, 1);
         weekday = d.get(Calendar.DAY_OF_WEEK);
      } 
      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 != Calendar.SUNDAY)
         System.out.println();
   }
}