java实现一个月的日历打印

import java.text.DateFormatSymbols;
import java.util.*;

public class Test
{
   public static void main(String[] args)
   {
      // construct d as current date
	  Locale.setDefault(Locale.ENGLISH);
	   
      GregorianCalendar d = new GregorianCalendar();
      
      int month = d.get(Calendar.MONTH); //用于循环打印当前月份的月历__月份判断
      int today = d.get(Calendar.DAY_OF_MONTH); //用于给当前日期后面加"*"
      
      String weekdays[] = new DateFormatSymbols().getShortWeekdays(); //保存7个星期名
   
      for(int i=1; i<8; ++i)
    	  System.out.print(weekdays[i]+" ");	//打印月历头部，7个星期名
      System.out.println();
      
      d.set(Calendar.DAY_OF_MONTH, 1); //设置d的日期为当月1号
      int weeknameofFirstday = d.get(Calendar.DAY_OF_WEEK);//获得当月1号的星期名
      
      int cnt = 1;
      while(weekdays[cnt] != weekdays[weeknameofFirstday])  //打印日历第一行，判断当月1号从第一行的哪里开始打印
      {
    	  System.out.print("    ");
    	  ++cnt;
      }
      
      do
      {
    	  int day = d.get(Calendar.DAY_OF_MONTH);
    	  System.out.printf("%3s", day);
    	  if(day == today)
    		  System.out.print("*");
    	  else
    		  System.out.print(" ");
    	  
    	  if(weekdays[d.get(Calendar.DAY_OF_WEEK)] == weekdays[7]) //判断是否需要换行打印
    		  System.out.println();
    	  d.add(Calendar.DAY_OF_MONTH, 1);
      }while(d.get(Calendar.MONTH) == month);
   }
}

结果打印效果：