java 根据出生日期计算年龄的方法

小灰灰 2023-10-02 12:51 3阅读 0赞

package com.common.util;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    public class AgeUtil {
        
    
         public static  Date parse(String strDate) throws ParseException {
          
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
                return sdf.parse(strDate);  
            }  
           //由出生日期获得年龄  
            public static  int getAge(Date birthDay) throws Exception {
          
                Calendar cal = Calendar.getInstance();  
                if (cal.before(birthDay)) {
          
                    throw new IllegalArgumentException(  
                            "The birthDay is before Now.It's unbelievable!");  
                }  
                int yearNow = cal.get(Calendar.YEAR);  
                int monthNow = cal.get(Calendar.MONTH);  
                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);   
          
                int age = yearNow - yearBirth;  
          
                if (monthNow <= monthBirth) {
          
                    if (monthNow == monthBirth) {
          
                        if (dayOfMonthNow < dayOfMonthBirth) age--;  
                    }else{
          
                        age--;  
                    }  
                }  
                return age;  
            }  
            
            public static void main(String args[]) {
         
                 try {
        
                    int  age = getAge(parse("2991-10-21"));
                    System.out.println("age=="+age);
                } catch (ParseException e) {
        
                    e.printStackTrace();
                } catch (Exception e) {
        
                    e.printStackTrace();
                } 
      
                  
            }
    }