根据出生年月日计算年龄

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本文介绍了一种使用Java实现计算年龄的方法。通过解析生日字符串并利用Calendar类来获取当前日期和出生日期的具体年月日信息，进而计算出精确的年龄。此方法考虑了月份和天数的影响，确保了计算结果的准确性。

private int countAge(String brithday){

int age = 0;

if(brithday != null && !brithday.isEmpty()){

Date brithDate = DateUtil.format(birthday, DateUtil.YYYYMMDD);

if(birthDate == null){

return 0;

}

            Calendar cal = Calendar.getInstance();
            int yearNow = cal.get(Calendar.YEAR);
            int monthNow = cal.get(Calendar.MONTH);
            int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);

            cal.setTime(birthDate);
            int yearBirth = cal.get(Calendar.YEAR);
            int monthBirth = cal.get(Calendar.MONTH);
            int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);

            // 计算年龄
            age = yearNow - yearBirth;
            if (monthNow <= monthBirth) {
                if (monthNow == monthBirth) {

if (dayOfMonthNow < dayOfMonthBirth)

age--;

                }else{
                    age--;
                }
            }
        }
        return age;

}