Calendar

<pre name="code" class="java">public static void main(String[] args) {Calendar calendar = Calendar.getInstance();System.out.println("年：" + calendar.get(Calendar.YEAR));System.out.println("月：" + (calendar.get(Calendar.MONTH) + 1));System.out.println("日：" + calendar.get(Calendar.DAY_OF_MONTH)); // Canlendar.DateSystem.out.println("星期：" + (calendar.get(Calendar.DAY_OF_WEEK) - 1));System.out.println("一年有多少个月："+ (calendar.getActualMaximum(Calendar.MONTH) + 1));System.out.println("一个月最大多少号："+ (calendar.getActualMaximum(Calendar.DAY_OF_MONTH)));System.out.println("一个月最小多少号："+ (calendar.getActualMinimum(Calendar.DAY_OF_MONTH)));// 求20天后的当前时间，并做时间格式化calendar.add(Calendar.DATE, 20);Date date = calendar.getTime();System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date));}