通过出生年月得到当前年龄java代码实例

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");
//得到当前的年份
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");//输入出生年份；
System.out.println(age);
}
}