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【Java】输入时间参数计算年龄

作者:亦菲 / 发布于2020/10/22/ 266

public static int getAgeByBirthday(Date birthday, Date treattime) {
Calendar cal1 = Calendar.getInstance();
cal1.setTime(treattime);
if (cal1.before(birthday)) {
throw new IllegalArgumentException(
"The birthDay is before Now.It's unbelievable!");
}
int yearNow = cal1.get(Calendar.YEAR);
int monthNow = cal1.get(Calendar.MONTH) + 1;
int dayOfMonthNow = cal1.get(Calendar.DAY_OF_MONTH);

Calendar cal2 = Calendar.getInstance();
cal2.setTime(birthday);
int yearBirth = cal2.get(Calendar.YEAR);
int monthBirth = cal2.get(Calendar.MONTH) + 1;
int dayOfMonthBirth = cal2.get(Calendar.DAY_OF_MONTH);
int age = yearNow - yearBirth;
if (monthNow <= monthBirth) {
if (monthNow == monthBirth) {
// monthNow==monthBirth 
if (dayOfMonthNow < dayOfMonthBirth) {
age--;
}
} else {
// monthNow>monthBirth 
age--;
}
}
return age;
}

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