CoreJava中日历代码=

package chapterfour;

import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;

public class CalendarTest
{
    public static void main(String[] args)
    {
        Locale.setDefault(Locale.US);    //设置地去

        Calendar d = new GregorianCalendar();
        int today = d.get(Calendar.DAY_OF_MONTH); // 获取今天
        int month = d.get(Calendar.MONTH); // 获取当前月

        d.set(Calendar.DAY_OF_MONTH, 1);
        int firstDayOfThisMonth = d.get(Calendar.DAY_OF_WEEK); // 本月第一天
        int firstDayOfWeek = d.getFirstDayOfWeek(); // 获取一周的第一天表示

        // 找到一个月的第一天和一周第一天之间的空白之处
        int tag = 0;
        while (firstDayOfThisMonth != firstDayOfWeek)
        {
            tag++;
            d.add(Calendar.DAY_OF_MONTH, -1);
            firstDayOfThisMonth = d.get(Calendar.DAY_OF_WEEK);
        }
        
        System.out.println(firstDayOfThisMonth == firstDayOfWeek);

        // 打印一个月的头部
        String[] variousWeekdays = new DateFormatSymbols().getShortWeekdays();
        do
        {
            System.out.printf("%4s", variousWeekdays[firstDayOfThisMonth]);
            d.add(Calendar.DAY_OF_MONTH, 1);
            firstDayOfThisMonth = d.get(Calendar.DAY_OF_WEEK);
        } 
        while (firstDayOfThisMonth != firstDayOfWeek);
        System.out.println();
        
         //打印一个月第一天之前的空白天数
         for (int i=0; i<tag; i++)
         {
             System.out.print("    ");
         }
                
         //开始打印
         d.set(Calendar.DAY_OF_MONTH, 1);
         while (month == d.get(Calendar.MONTH))
         {
             int currentDay = d.get(Calendar.DAY_OF_MONTH);
             
             if (currentDay == today)
             {
                 System.out.printf("%3d", currentDay);
                 System.out.print("*");
             }
             else
             {
                 System.out.printf("%4d", currentDay);
             }
             
             d.add(Calendar.DAY_OF_MONTH, 1);
             firstDayOfThisMonth = d.get(Calendar.DAY_OF_WEEK);
             if (firstDayOfThisMonth == firstDayOfWeek)
             {
                 System.out.println();
             }
         }

    }
}

输出: