/**
 * 程序運行當年的日歷，程序運行當日以*號表示
 */

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);                  //設置為當年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"); //輸出月表頭
   month = d.get(Calendar.MONTH);                //取得月份    
   int weekday = d.get(Calendar.DAY_OF_WEEK);    //獲得當月1號,在一周中是星期幾
   for(int i = Calendar.SUNDAY; i < weekday; i++)//控制當月1號的起始位置
    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,多輸出一個空格,以便對齊
     System.out.print(" ");
    System.out.print(d.get(Calendar.DAY_OF_MONTH));//輸出日期
    if (today == d.get(Calendar.DAY_OF_YEAR)) //如果是當日,則輸出一個*號
     System.out.print("* ");
    else
     System.out.print("  ");
    if (weekday == Calendar.SATURDAY)         //到達周六,則換行
     System.out.println();
    d.add(Calendar.DAY_OF_YEAR,1);            //日期累加
   } while (d.get(Calendar.MONTH) == month);     //如果還是當月,繼續循環
   System.out.println("\n");
  } while (d.get(Calendar.YEAR) == year);           //如果還是當年,繼續循環
 }
}