程式代碼:
DateFormat dateFormat =
new SimpleDateFormat("yyyy-MM-dd");
Date birth = dateFormat.parse(args[0]);
Date current = new Date();
long life = current.getTime() - birth.getTime();
System.out.println("你今年的歲數為:" +
(life / (1L * 365 * 24 * 60 * 60 * 1000)));