通過出生年月得到當前年齡java代碼實例

此java示例是通過輸入出生年齡計算年齡的代碼：

import java.text.SimpleDateFormat;
import java.util.Date;


public class Test {
    public static int getAgeByBirthDay(String birthDay){
        if (birthDay == null || birthDay.length()<4) {
            return 0;
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        //得到當前的年份
        String cYear = sdf.format(new Date()).substring(0,4);
        String cMouth = sdf.format(new Date()).substring(5,7);
        String cDay = sdf.format(new Date()).substring(8,10);
        //得到生日年份
        String birth_Year = birthDay .substring(0,4);
        String birth_Mouth = birthDay .substring(5,7);
        String birth_Day = birthDay .substring(8,10);
        int age = Integer.parseInt(cYear) - Integer.parseInt(birth_Year);
        if ((Integer.parseInt(cMouth) - Integer.parseInt(birth_Mouth))<0) {
            age=age-1;
        }else if ((Integer.parseInt(cMouth) - Integer.parseInt(birth_Mouth))==0) {
            if ( (Integer.parseInt(cDay) - Integer.parseInt(birth_Day))>0) {
                age=age-1;
            }else {
                age = Integer.parseInt(cYear) - Integer.parseInt(birth_Year);
            }
        }else if ((Integer.parseInt(cMouth) - Integer.parseInt(birth_Mouth))>0) {
            age = Integer.parseInt(cYear) - Integer.parseInt(birth_Year);
        }


        return age;
    }

    public static void main(String[] args) {
        Test test=new Test();
        int age=test.getAgeByBirthDay("2015-05-11");//輸入出生年份；
        System.out.println(age);
    }
}