//用Calendar日曆物件
 public static void main(String[] args) throws IOException, ClassNotFoundException {
     test3();
 }

 /**
  * 使用Calendar日曆物件對時間的1.獲取 年，月，日，
  * @throws IOException
  */
 private static void test1() throws IOException {
     Calendar c = Calendar.getInstance();
     int year = c.get(Calendar.YEAR);
     int month = c.get(Calendar.MONTH)+1;
     int day = c.get(Calendar.DAY_OF_MONTH);
     int week_day  =c.get(Calendar.DAY_OF_WEEK);
     System.out.println(year+"年"+month+"月"+day+"日"+"星期"+week_day);

 }
 /**
  * 使用Calendar日曆物件對時間的1.修改 年，月，日，
  * @throws IOException
  */
 private static void test2() throws IOException {
     Calendar c = Calendar.getInstance();

     //修改時間
     c.add(Calendar.YEAR,1);
     c.add(Calendar.MONTH,-1);
     c.add(Calendar.DAY_OF_MONTH,-6);


     int year = c.get(Calendar.YEAR);
     int month = c.get(Calendar.MONTH)+1;
     int day = c.get(Calendar.DAY_OF_MONTH);
     int week_day  =c.get(Calendar.DAY_OF_WEEK);
     System.out.println(year+"年"+month+"月"+day+"日"+"星期"+week_day);

 }

 /**
  * 使用Calendar日曆物件對時間的1.設定 年，月，日，
  * @throws IOException
  */
 private static void test3() throws IOException {
     Calendar c = Calendar.getInstance();

       //設定時間
     c.set(Calendar.YEAR,2011);

     int year = c.get(Calendar.YEAR);
     int month = c.get(Calendar.MONTH)+1;
     int day = c.get(Calendar.DAY_OF_MONTH);
     int week_day  =c.get(Calendar.DAY_OF_WEEK);
     System.out.println(year+"年"+month+"月"+day+"日"+"星