根据出生日期Date 计算年龄

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根据出生日期计算年龄

public class DateGetAge{    public static int getAge(Date birthDay) throws Exception    {        Calendar cal = Calendar.getInstance();        if (cal.before(birthDay))        {            throw new IllegalArgumentException(                                               "The birthDay is before Now.It's unbelievable!");        }        int yearNow = cal.get(Calendar.YEAR);        int monthNow = cal.get(Calendar.MONTH);        int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);        cal.setTime(birthDay);        int yearBirth = cal.get(Calendar.YEAR);        int monthBirth = cal.get(Calendar.MONTH);        int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);        int age = yearNow - yearBirth;        if (monthNow <= monthBirth)        {            if (monthNow == monthBirth)            {                if (dayOfMonthNow < dayOfMonthBirth)                    age--;            }            else            {                age--;            }        }        return age;    }}

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