java 根据出生日期 获取年龄

您好，根据出生日期获取年龄的 Java 代码如下：

public static int getAge(Date birthDate) {
    Calendar cal = Calendar.getInstance();

    if (cal.before(birthDate)) {
        throw new IllegalArgumentException("出生日期在当前日期之后，无法计算年龄！");
    }

    int yearNow = cal.get(Calendar.YEAR);
    int monthNow = cal.get(Calendar.MONTH) + 1;
    int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);

    cal.setTime(birthDate);
    int yearBirth = cal.get(Calendar.YEAR);
    int monthBirth = cal.get(Calendar.MONTH) + 1;
    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;
}

希望能对您有所帮助。