/**
 * 程序运行当年的日历，程序运行当日以*号表示
 */

import java.util.*;

public class CalendarTest {
 public static void main(String[] args) {
  GregorianCalendar d = new GregorianCalendar();
  int year = d.get(Calendar.YEAR);
  int month = d.get(Calendar.MONTH);
  int today = d.get(Calendar.DAY_OF_YEAR);
  d.set(d.get(Calendar.YEAR),0,1);                  //设置为当年1月1日(0表示1月)
  do {
   System.out.println(d.get(Calendar.MONTH) + 1 + "月");
   System.out.println("Sun Mon Tue Wed Thu Fri Sat"); //输出月表头
   month = d.get(Calendar.MONTH);                //取得月份    
   int weekday = d.get(Calendar.DAY_OF_WEEK);    //获得当月1号,在一周中是星期几
   for(int i = Calendar.SUNDAY; i < weekday; i++)//控制当月1号的起始位置
    System.out.print("    ");
   do {
    weekday = d.get(Calendar.DAY_OF_WEEK);
    if (d.get(Calendar.DAY_OF_MONTH) < 10)    //如果日期小于10,多输出一个空格,以便对齐
     System.out.print(" ");
    System.out.print(d.get(Calendar.DAY_OF_MONTH));//输出日期
    if (today == d.get(Calendar.DAY_OF_YEAR)) //如果是当日,则输出一个*号
     System.out.print("* ");
    else
     System.out.print("  ");
    if (weekday == Calendar.SATURDAY)         //到达周六,则换行
     System.out.println();
    d.add(Calendar.DAY_OF_YEAR,1);            //日期累加
   } while (d.get(Calendar.MONTH) == month);     //如果还是当月,继续循环
   System.out.println("\n");
  } while (d.get(Calendar.YEAR) == year);           //如果还是当年,继续循环
 }
}