Java 計算年齡

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import org.junit.Test;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * @author ceshi * @Title: JunitAge * @ProjectName ceshi * @Description: TODO * @date 2018/6/2721:00 */public class JunitAge {    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");    @Test    public void testAge()throws Exception{        int  age = getAge(format.parse("1993-06-27"));        System.out.println(age);    }    //由出生日期獲得年齡    public  int getAge(Date birthDay) throws Exception {        int age = 0;        Calendar cal = Calendar.getInstance();        if (cal.before(birthDay)) {           return age;        }        int yearNow = cal.get(Calendar.YEAR);        int monthNow = cal.get(Calendar.MONTH);        int dayNow = cal.get(Calendar.DAY_OF_MONTH);        cal.setTime(birthDay);        int yearBirth = cal.get(Calendar.YEAR);        int monthBirth = cal.get(Calendar.MONTH);        int dayBirth = cal.get(Calendar.DAY_OF_MONTH);        //年相減        age = yearNow - yearBirth;        //判斷月份        if (monthNow <= monthBirth) {            if (monthNow == monthBirth) {                //判斷天                if (dayNow < dayBirth){                    age--;                }            }else{                age--;            }        }        return age;    }}

 

Java 計算年齡