根据出生日期判断年龄

package com.star.wantong.db;

 

import java.util.Calendar;

import java.util.GregorianCalendar;

 

public class Num {

 

public static int calcAge(String birthday) { 

int iage = 0; 

if (birthday != "" || birthday != null) { 

int year = Integer.parseInt(birthday.substring(0, 4)); 

int month = Integer.parseInt(birthday.substring(4, 6)); 

int day = Integer.parseInt(birthday.substring(6,8)); 

 

Calendar birthDate = new GregorianCalendar(year, month, day); 

Calendar today = Calendar.getInstance(); 

 

if (today.get(Calendar.YEAR) > birthDate.get(Calendar.YEAR)) { 

iage = today.get(Calendar.YEAR) - birthDate.get(Calendar.YEAR) 

- 1; 

if (today.get(Calendar.MONTH) + 1 > birthDate 

.get(Calendar.MONTH)) { 

iage++; 

} else if (today.get(Calendar.MONTH) + 1 == birthDate 

.get(Calendar.MONTH)) { 

if (today.get(Calendar.DAY_OF_MONTH) > birthDate 

.get(Calendar.DAY_OF_MONTH)) { 

iage++; 

} 

} 

} 

return iage; 

} 

return 0; 

}

public static void main(String[] args) {

System.out.println(Num.calcAge("20000314"));

}

}