java計算年齡的工具類

 1  public static int getAgeByBirth(String birthday) throws ParseException {
 2             // 格式化传入的时间
 3             SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
 4             Date parse = format.parse(birthday);
 5             int age = 0;
 6             try {
 7                 Calendar now = Calendar.getInstance();
 8                 now.setTime(new Date()); // 当前时间
 9 
10                 Calendar birth = Calendar.getInstance();
11                 birth.setTime(parse); // 传入的时间
12 
13                 //如果传入的时间，在当前时间的后面，返回0岁
14                 if (birth.after(now)) {
15                     age = 0;
16                 } else {
17                     age = now.get(Calendar.YEAR) - birth.get(Calendar.YEAR);
18                     if (now.get(Calendar.DAY_OF_YEAR) > birth.get(Calendar.DAY_OF_YEAR)) {
19                         age += 1;
20                     }
21                 }
22                 return age;
23             } catch (Exception e) {
24                 return 0;
25             }
26         }