Java中能否直接将输入转为double数组？求代码简化方案

我正在做一个微积分课程项目，要写程序求解任意两条直线或平面的交点。但已经一年没写代码，很多编程知识都忘了，现在这段输入处理的代码重复度很高，想简化一下。目前我让用户输入两条直线的位置向量和方向向量，再一步步转成double数组，想知道有没有更高效的实现方式，比如能不能直接把输入存成double数组？

当前代码如下：

System.out.println("Input the position vector of the first line in the format x,y,z with no spaces.");
String posv1 = vscanner.nextLine();
System.out.println("Input the direction vector of the first line in the format x,y,z with no spaces.");
String dirv1 = vscanner.nextLine();
System.out.println("Input the position vector of the second line in the format x,y,z with no spaces.");
String posv2 = vscanner.nextLine();
System.out.println("Input the direction vector of the second line in the format x,y,z with no spaces.");
String dirv2 = vscanner.nextLine();

vscanner.close();

//split all vectors at commas and place in array
String[] posv1s = posv1.split(","); String[] dirv1s = dirv1.split(","); String[] posv2s = posv2.split(","); String[] dirv2s = dirv2.split(","); 

//convert string array to double array
double[] posv1d = Arrays.stream(posv1s).mapToDouble(Double::parseDouble).toArray();
double[] dirv1d = Arrays.stream(dirv1s).mapToDouble(Double::parseDouble).toArray();   
double[] posv2d = Arrays.stream(posv2s).mapToDouble(Double::parseDouble).toArray();
double[] dirv2d = Arrays.stream(dirv2s).mapToDouble(Double::parseDouble).toArray();

核心思路是把重复的「提示输入→读取字符串→拆分转换为double数组」逻辑提取成工具方法，调用方法就能直接得到double数组，彻底消除重复代码。

实现代码 #

import java.util.Scanner;
import java.util.Arrays;

public class LineIntersection {
    public static void main(String[] args) {
        Scanner vscanner = new Scanner(System.in);

        // 直接调用工具方法获取目标double数组
        double[] posv1d = readVector(vscanner, "Input the position vector of the first line in the format x,y,z with no spaces.");
        double[] dirv1d = readVector(vscanner, "Input the direction vector of the first line in the format x,y,z with no spaces.");
        double[] posv2d = readVector(vscanner, "Input the position vector of the second line in the format x,y,z with no spaces.");
        double[] dirv2d = readVector(vscanner, "Input the direction vector of the second line in the format x,y,z with no spaces.");

        vscanner.close();

        // 后续业务逻辑直接使用这些double数组即可
    }

    // 提取的工具方法：统一处理向量输入，直接返回double数组
    private static double[] readVector(Scanner scanner, String prompt) {
        System.out.println(prompt);
        String input = scanner.nextLine();
        return Arrays.stream(input.split(","))
                     .mapToDouble(Double::parseDouble)
                     .toArray();
    }
}

优化点说明 #

• 彻底消除重复代码，代码结构更简洁，可读性提升明显
• 后续如果需要调整输入逻辑（比如添加格式验证，确保输入是3个有效数字），只需要修改readVector这一个方法，无需多处改动
• 跳过中间的字符串数组变量，一步到位得到目标double数组，减少代码冗余

内容的提问来源于stack exchange，提问作者Rani