Java 根据Calendar 计算年龄精确到时分秒

好的，让我来告诉你如何通过 Java 根据 Calendar 计算年龄精确到时分秒。首先，你需要获取当前的时间和出生日期，然后计算两者之间的差值。

以下是一个示例代码，可以实现计算年龄精确到时分秒的功能：

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
 
public class CalculateAge {
 
   public static void main(String[] args) {
      SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
      Calendar dob = Calendar.getInstance();
      dob.set(1990, 0, 1, 0, 0, 0); // 设置出生日期为 1990 年 1 月 1 日 00:00:00
      Date birthDate = dob.getTime();
 
      // 获取当前时间
      Calendar now = Calendar.getInstance();
      Date currentDate = now.getTime();
 
      // 计算年龄
      long diffInMillies = currentDate.getTime() - birthDate.getTime();
      long diffInSeconds = diffInMillies / 1000;
      long diffInMinutes = diffInSeconds / 60;
      long diffInHours = diffInMinutes / 60;
      long diffInDays = diffInHours / 24;
      long diffInYears = now.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
      dob.add(Calendar.YEAR, diffInYears);
 
      // 将出生日期加上年龄
      if (now.before(dob)) {
         diffInYears--;
         now.add(Calendar.YEAR, -1);
      }
 
      dob.add(Calendar.YEAR, diffInYears);
      long diffInMillis = now.getTimeInMillis() - dob.getTimeInMillis();
      int ageHours = (int) (diffInMillis / (60 * 60 * 1000));
      int ageMins = (int) ((diffInMillis / (60 * 1000)) % 60);
      int ageSeconds = (int) ((diffInMillis / 1000) % 60);
 
      System.out.println("年龄精确到时分秒：" + diffInYears + "岁 " + diffInDays + "天 " + ageHours + "小时 "
            + ageMins + "分钟 " + ageSeconds + "秒");
   }
}

你可以根据自己的需要进行修改，并且你可以进行更多的代码测试，希望能帮到你。