下面一段代碼給大家分享java根據身份證計算年齡的方法，具體代碼如下所示：
birthDate = idCard.substring(6,10)+"-"+idCard.substring(10,12)+"-"+idCard.substring(12,14)public static int getAgefromBirthTime(String birthTimeString){ // 先截取到字符串中的年、月、日String strs[] = birthTimeString.trim().split("-"); int selectYear = Integer.parseInt(strs[0]); int selectMonth = Integer.parseInt(strs[1]); int selectDay = Integer.parseInt(strs[2]); // 得到當前時間的年、月、日Calendar cal = Calendar.getInstance(); int yearNow = cal.get(Calendar.YEAR); int monthNow = cal.get(Calendar.MONTH) + 1; int dayNow = cal.get(Calendar.DATE); // 用當前年月日減去生日年月日int yearMinus = yearNow - selectYear; int monthMinus = monthNow - selectMonth; int dayMinus = dayNow - selectDay; int age = yearMinus; if (yearMinus < 0) {// 選了未來的年份age = 0; } else if (yearMinus == 0) {// 同年的，要么為1，要么為0 if (monthMinus < 0) {// 選了未來的月份age = 0; } else if (monthMinus == 0) {// 同月份的if (dayMinus < 0) {// 選了未來的日期age = 0; } else if (dayMinus >= 0) { age = 1; } } else if (monthMinus > 0) { age = 1; } } else if (yearMinus > 0) { if (monthMinus < 0) {// 當前月>生日月} else if (monthMinus == 0) {// 同月份的，再根據日期計算年齡if (dayMinus < 0) { } else if (dayMinus >= 0) { age = age + 1; } } else if (monthMinus > 0) { age = age + 1; } } return age;}下面在看下java根據出生日期獲得年齡
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--; } } System.out.println("age:"+age); return age; }總結
以上所述是小編給大家介紹的JAVA 根據身份證計算年齡，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對武林網網站的支持！