JAVA根据生日计算年龄（年月日）

根据生日计算距离今天几年几个月几天

1Date birthday = xxxxxxxx
2Calendar now = Calendar.getInstance();
3            Calendar b = Calendar.getInstance();
4            b.setTime(birthday);
5            int year = now.get(Calendar.YEAR) - b.get(Calendar.YEAR);
6            int month = now.get(Calendar.MONTH) - b.get(Calendar.MONTH);
7            int day = now.get(Calendar.DAY_OF_MONTH) - b.get(Calendar.DAY_OF_MONTH);
8            if (month < 0) {
9                month = 12 - b.get(Calendar.MONTH) + now.get(Calendar.MONTH);
10                year -= 1;
11            }
12            if (day < 0) {
13                day = b.getMaximum(Calendar.DAY_OF_MONTH) - b.get(Calendar.DAY_OF_MONTH) + now.get(Calendar.DAY_OF_MONTH);
14                month -= 1;
15            }
16            // year + "岁" + month + "个月" + day + "天";