get Age from Birthday - Java java.util

Java examples for java.util:Day

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Description

get Age from Birthday

Demo Code


//package com.java2s;

import java.util.Calendar;
import java.util.Date;

public class Main {
    public static void main(String[] argv) throws Exception {
        Date birthDay = new Date();
        System.out.println(getAge(birthDay));
    }/*  w w w  .  j av  a2  s .c o m*/

    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) {
                //monthNow==monthBirth
                if (dayOfMonthNow < dayOfMonthBirth) {
                    age--;
                } else {
                    //do nothing
                }
            } else {
                //monthNow>monthBirth
                age--;
            }
        } else {
            //monthNow<monthBirth
            //donothing
        }

        return age;
    }
}

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