Java 根据身份证计算实际年龄

一、流程图

下面是计算身份证对应实际年龄的流程图:

步骤 操作
1 获取输入的身份证号码
2 解析身份证号码中的出生年月日
3 计算当前日期与出生日期的差值
4 根据差值计算实际年龄

二、实现步骤

1. 获取输入的身份证号码

首先,我们需要获取用户输入的身份证号码。在 Java 中,可以使用 Scanner 类来实现:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入身份证号码:");
        String idCard = scanner.nextLine();
    }
}

2. 解析身份证号码中的出生年月日

接下来,我们需要从身份证号码中提取出生年月日信息。可以使用正则表达式来匹配身份证号码格式:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入身份证号码:");
        String idCard = scanner.nextLine();
        
        // 正则表达式匹配身份证号码中的出生年月日
        Pattern pattern = Pattern.compile("\\d{6}(\\d{4})(\\d{2})(\\d{2})\\d{4}");
        Matcher matcher = pattern.matcher(idCard);
        if (matcher.matches()) {
            int year = Integer.parseInt(matcher.group(1));
            int month = Integer.parseInt(matcher.group(2));
            int day = Integer.parseInt(matcher.group(3));
        }
    }
}

3. 计算当前日期与出生日期的差值

现在,我们已经获取到了出生年月日信息,接下来计算当前日期与出生日期的差值:

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入身份证号码:");
        String idCard = scanner.nextLine();
        
        Pattern pattern = Pattern.compile("\\d{6}(\\d{4})(\\d{2})(\\d{2})\\d{4}");
        Matcher matcher = pattern.matcher(idCard);
        if (matcher.matches()) {
            int year = Integer.parseInt(matcher.group(1));
            int month = Integer.parseInt(matcher.group(2));
            int day = Integer.parseInt(matcher.group(3));
            
            LocalDate birthDate = LocalDate.of(year, month, day);
            LocalDate currentDate = LocalDate.now();
            long age = ChronoUnit.YEARS.between(birthDate, currentDate);
        }
    }
}

4. 根据差值计算实际年龄

最后,我们根据差值计算实际年龄并输出结果:

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入身份证号码:");
        String idCard = scanner.nextLine();
        
        Pattern pattern = Pattern.compile("\\d{6}(\\d{4})(\\d{2})(\\d{2})\\d{4}");
        Matcher matcher = pattern.matcher(idCard);
        if (matcher.matches()) {
            int year = Integer.parseInt(matcher.group(1));
            int month = Integer.parseInt(matcher.group(2));
            int day = Integer.parseInt(matcher.group(3));
            
            LocalDate birthDate = LocalDate.of(year, month, day);
            LocalDate currentDate = LocalDate.now();
            long age = ChronoUnit.YEARS.between(birthDate, currentDate);
            
            System.out.println("实际年龄为:" + age);
        }
    }
}

结论

通过以上步骤,我们可以实现根据身份证计算实际年龄的功能。希望这篇文章对你有所帮助,如果有任何疑问或需要进一步的指导,请随时与我联系。祝你学习顺利!