java根据生日计算年龄工具类

private static int getAgeByBirth(Date birthday) {
int age = 0;
try {
Calendar now = Calendar.getInstance();
now.setTime(new Date());// 当前时间

Calendar birth = Calendar.getInstance();
birth.setTime(birthday);

if (birth.after(now)) {//如果传入的时间，在当前时间的后面，返回0岁
age = 0;
} else {
age = now.get(Calendar.YEAR) - birth.get(Calendar.YEAR);
if (now.get(Calendar.DAY_OF_YEAR) > birth.get(Calendar.DAY_OF_YEAR)) {
age += 1;
}
}
return age;
} catch (Exception e) {//兼容性更强,异常后返回数据
return 0;
}
}

// 定义一个出生时间
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date bithday = format.parse("1994-08-23 17:20:20");
int age = getAgeByBirth(bithday);
System.out.println(age);