日历
按日计算年龄¶
import java.util.Calendar;
// 由出生日期计算年龄
public static int getAgeByBirthday(int yearBirth, int monthBirth, int dayOfMonthBirth) {
Calendar cal = Calendar.getInstance();
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH) + 1; // 获取月份的时候要注意 +1
int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
int age = yearNow - yearBirth;
if (monthNow <= monthBirth) {
if (monthNow == monthBirth) {
if (dayOfMonthNow < dayOfMonthBirth) {
age--;
}
} else {
age--;
}
}
if (age < 0) {
return 0;
}
return age;
}
public static void main(String[] args) {
System.out.println("Today: " + Calendar.getInstance().getTime()); // Today: Mon Aug 27 17:10:02 CST 2018
System.out.println("age: " + getAgeByBirthday(1988, 8, 23)); // age: 30
System.out.println("age: " + getAgeByBirthday(1990, 8, 23)); // age: 28
System.out.println("age: " + getAgeByBirthday(1991, 8, 23)); // age: 27
System.out.println("age: " + getAgeByBirthday(2000, 8, 26)); // age: 18
System.out.println("age: " + getAgeByBirthday(2000, 8, 27)); // age: 18
System.out.println("age: " + getAgeByBirthday(2018, 8, 28)); // age: 0
System.out.println("age: " + getAgeByBirthday(2019, 8, 23)); // age: 0
}
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