package com.edu.testAge; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; /** * @author June * @date 2021/12/27 16:05 */ public class Client { public static Date parse(String strDate) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); return sdf.parse(strDate); } public static int getAge(Date birthDay) throws Exception { Calendar cal = Calendar.getInstance(); if (cal.before(birthDay)) { //出生日期晚于当前时间,无法计算 throw new IllegalArgumentException( "日期填写错误!!"); } int yearNow = cal.get(Calendar.YEAR); //当前年份 int monthNow = cal.get(Calendar.MONTH); //当前月份 int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); //当前日期 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; //计算整岁数 if (monthNow <= monthBirth) { if (monthNow == monthBirth) { if (dayOfMonthNow < dayOfMonthBirth) age--;//当前日期在生日之前,年龄减一 }else{ age--;//当前月份在生日之前,年龄减一 } } return age; } public static void main(String[] args) { try { int age = getAge(parse("1984-09-27")); //由出生日期获得年龄*** System.out.println("age:"+age); } catch (Exception e) { e.printStackTrace(); } } }