private int getAge(Date birthDay) {Calendar cal = Calendar.getInstance();//出生日期晚于當(dāng)前時(shí)間，無法計(jì)算if (cal.before(birthDay)) {throw new IllegalArgumentException("The birthDay is before Now.It's unbelievable!");}//當(dāng)前年份int yearNow = cal.get(Calendar.YEAR);//當(dāng)前月份int monthNow = cal.get(Calendar.MONTH);//當(dāng)前日期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);//計(jì)算整歲數(shù)int age = yearNow - yearBirth;if (monthNow <= monthBirth) {if (monthNow == monthBirth) {if (dayOfMonthNow < dayOfMonthBirth) {//當(dāng)前日期在生日之前，年齡減一age--;}} else {//當(dāng)前月份在生日之前，年齡減一age--;}}return age;}

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https://blog.csdn.net/qq_44621483/article/details/108573019

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程序記錄：

??通過輸入出生日期字符串，返回年齡

源碼展示：

public static int getAgeForBirthday(String birthday){//定義一個(gè)日期格式y(tǒng)yyy-MM-dd，將String轉(zhuǎn)為DateSimpleDateFormat simp = new SimpleDateFormat("yyyy-MM-dd");Date date = null;try {date = simp.parse(birthday);} catch (ParseException e) {e.printStackTrace();}//判斷該生日是否在當(dāng)前日期之前,設(shè)置一個(gè)初始值，表示輸入日期錯(cuò)誤if(date.after(new Date())){return -1;}//獲取當(dāng)前日歷對(duì)象中的年、月、日Calendar nowc = Calendar.getInstance();int nowYear = nowc.get(Calendar.YEAR);int nowMonth = nowc.get(Calendar.MONTH);int nowDay = nowc.get(Calendar.DAY_OF_MONTH);//將Date轉(zhuǎn)為Calendar日歷對(duì)象,獲取生日的年、月、日nowc.setTime(date);//通過年月日計(jì)算該對(duì)象的年紀(jì)//先通過Year計(jì)算初步年齡int year = nowYear-nowc.get(Calendar.YEAR);//通過Month和Day判斷是否過生日if(nowc.get(Calendar.MONTH)>nowMonth){return year-1;}if (nowc.get(Calendar.DAY_OF_MONTH)>nowDay){return year-1;}return year;}

思路

??由于String類型不能直接獲取時(shí)間信息，所以將其轉(zhuǎn)為Date類型，但獲取Date類方法獲取的只有毫秒為單位的時(shí)間，直接與當(dāng)前時(shí)間計(jì)算的到的是毫秒值，由于還要考慮當(dāng)前時(shí)間到出生日期間的閏年問題和月份天數(shù)不同等問題，還需要將Date類型轉(zhuǎn)為Calendar類型，Calendar類型可直接獲得當(dāng)前日期和指定日期的年月日，先通過獲取的年獲取大概的年齡，再通過月和日判斷當(dāng)前日期是否已經(jīng)過了生日由此對(duì)大概年齡減1。

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Java 根據(jù)出生日期計(jì)算年齡

https://www.cnblogs.com/fuchuanzhipan1209/p/9596614.html

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Java 根據(jù)出生日期計(jì)算年齡

1.把出生日期字符串轉(zhuǎn)換為日期格式。

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public?static??Date parse(String strDate)?throws?ParseException { ????????SimpleDateFormat sdf =?new?SimpleDateFormat("yyyy-MM-dd"); ????????return?sdf.parse(strDate); ????}

2.計(jì)算年齡

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public?static??int?getAge(Date birthDay)?throws?Exception { ????????Calendar cal = Calendar.getInstance();? ????????if?(cal.before(birthDay)) {?//出生日期晚于當(dāng)前時(shí)間，無法計(jì)算 ????????????throw?new?IllegalArgumentException( ????????????????????"The birthDay is before Now.It's unbelievable!"); ????????} ????????int?yearNow = cal.get(Calendar.YEAR);??//當(dāng)前年份 ????????int?monthNow = cal.get(Calendar.MONTH);??//當(dāng)前月份 ????????int?dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);?//當(dāng)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;???//計(jì)算整歲數(shù) ????????????if?(monthNow <= monthBirth) { ????????????if?(monthNow == monthBirth) { ????????????????if?(dayOfMonthNow < dayOfMonthBirth) age--;//當(dāng)前日期在生日之前，年齡減一 ????????????}else{ ????????????????age--;//當(dāng)前月份在生日之前，年齡減一

1	} }?return?age; }

3.執(zhí)行方法

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public?static?void?main(String[] args) { ????????try?{ ??????????int??age = getAge(parse("1990-09-27"));???????????//由出生日期獲得年齡*** ??????????System.out.println("age:"+age); ????????}?catch?(Exception e) { ????????????e.printStackTrace(); ????????} ????}

　　

　

分類:?java工具

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