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public static int getAgeByBirth(Date birthDay) throws ParseException {int age = 0;Calendar cal = Calendar.getInstance();if (cal.before(birthDay)) { //出生日期晚于当前时间，无法计算throw new IllegalArgumentException("The birthDay is before Now.It's unbelievable!");}int yearNow = cal.get(Calendar.YEAR); //当前年份int monthNow = cal.get(Calendar.MONTH); //当前月份int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); //当前日期cal.setTime(birthDay);int yearBirth = cal.get(Calendar.YEAR);int monthBirth = cal.get(Calendar.MONTH);int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);age = yearNow - yearBirth; //计算整岁数if (monthNow <= monthBirth) {if (monthNow == monthBirth) {if (dayOfMonthNow < dayOfMonthBirth) age--;//当前日期在生日之前，年龄减一} else {age--;//当前月份在生日之前，年龄减一}}return age;}转载自：https://blog.csdn.net/sunnyljs/article/details/80934685
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