下面一段代码给大家分享java根据身份证计算年龄的方法，具体代码如下所示：
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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]);
// 得到当前时间的年、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);
// 用当前年月日减去生日年月日
int yearminus = yearnow - selectyear;
int monthminus = monthnow - selectmonth;
int dayminus = daynow - selectday;
int age = yearminus;
if (yearminus < 0) {// 选了未来的年份
age = 0;
} else if (yearminus == 0) {// 同年的，要么为1，要么为0
if (monthminus < 0) {// 选了未来的月份
age = 0;
} else if (monthminus == 0) {// 同月份的
if (dayminus < 0) {// 选了未来的日期
age = 0;
} else if (dayminus >= 0) {
age = 1;
}
} else if (monthminus > 0) {
age = 1;
}
} else if (yearminus > 0) {
if (monthminus < 0) {// 当前月>生日月
} else if (monthminus == 0) {// 同月份的，再根据日期计算年龄
if (dayminus < 0) {
} else if (dayminus >= 0) {
age = age + 1;
}
} else if (monthminus > 0) {
age = age + 1;
}
}
return age;
}
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下面在看下java根据出生日期获得年龄
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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;
}
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总结
以上所述是小编给大家介绍的java 根据身份证计算年龄，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：https://blog.csdn.net/HrlSnow/article/details/80266906