java常用获取年月日以及格式化方法

摘一段java常用获取年月日以及格式化代码：

1. public class DateTest {
3.     public static void main(String[] args) throws ParseException {
4.         Calendar now = Calendar.getInstance();
5.         System.out.println(“年: “ + now.get(Calendar.YEAR));
6.         System.out.println(“月: “ + (now.get(Calendar.MONTH) + 1) + “”);
7.         System.out.println(“日: “ + now.get(Calendar.DAY_OF_MONTH));
8.         System.out.println(“时: “ + now.get(Calendar.HOUR_OF_DAY));
9.         System.out.println(“分: “ + now.get(Calendar.MINUTE));
10.         System.out.println(“秒: “ + now.get(Calendar.SECOND));
11.         System.out.println(“当前时间毫秒数：” + now.getTimeInMillis());
12.         System.out.println(now.getTime());
14.         Date d = new Date();
15.         System.out.println(d);
16.         SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
17.         String dateNowStr = sdf.format(d);
18.         System.out.println(“格式化后的日期：” + dateNowStr);
20.         String str = “2012-1-13 17:26:33”;  //要跟上面sdf定义的格式一样
21.         Date today = sdf.parse(str);
22.         System.out.println(“字符串转成日期：” + today);
23.     }
24. }