将 CSV 文件中的数据存储到二维数组

Question

我正在尝试制作一个对 2D 数组执行某种排序的程序，但我无法找到一种方法将 CSV 文件中的数据放入 2D 数组中。我知道数组列表，但我不想在这里使用数组列表。

如果除了有关数组的事情之外不对程序的其他部分进行任何更改，我将不胜感激

我现在可以正确编译代码，但是当程序运行时，我得到 ArrayIndexOutOfBoundsException：索引 5 超出长度 5 的范围

数据存储在 CSV 文件中：

Lana,20,6.3
Daniel,30,2.8
Lucas,29,4.9
Henry,19,8.2
Johnny,59,5.3

代码：

import java.util.*;
import java.io.*;

public class personProgram
{
    public static void main(String[] args)
    {

                
        readFile("PersonStorage.csv");
        
    }

        public static void readFile(String pFileName)
    {   
        FileInputStream fileStream = null;
        InputStreamReader rdr;
        BufferedReader bufRdr;
        int lineNum;
        String line;
        
        try
        {
            fileStream = new FileInputStream(pFileName);
            rdr = new InputStreamReader(fileStream);
            bufRdr = new BufferedReader(rdr);
            lineNum = 0;
            line = bufRdr.readLine();
            while(line != null)
            {
                lineNum++;
                processLine(line);
                line = bufRdr.readLine();
            }
                    fileStream.close();
        }
        catch (IOException errorDetails)
            { 
            if(fileStream != null)
            {
                try
                {
                    fileStream.close();
                }
                catch(IOException ex2)
                { }
            }
            System.out.println("Error in fileProcessing: " + errorDetails.getMessage());
        }
    }

    private static void processLine(String csvRow)
    {
        String[] data;
        data = csvRow.split(",");
        int lineLength = data.length;
        String name = data[0];
        int age = Integer.parseInt(data[1]);
        double time = Double.parseDouble(data[2]);
        
        int rows = 5;
        int cols = 3;
        
        Person[][] persons = new Person[rows][cols];

        persons[rows][0] = new Person(name, age, time);
        rows++;

        //this is me testing
        System.out.print(persons[2][0]);

    }


}

Answer 1

检查代码，如果你想要的话

import java.io.File;
import java.nio.file.Files;
import java.util.List;

public class PersonProgram {

    public static void main(String[] args) {
        readFile("./PersonStorage.csv");
    }

    public static void readFile(String pFileName) {
        File file = new File(pFileName);
        if (!file.exists()) {
            System.err.println("File does not exist: " + pFileName);
            return;
        }

        try {
            List<String> lines = Files.readAllLines(file.toPath());
            Person[] persons = new Person[lines.size()];
            int index = 0;
            for (String line : lines) {
                processLine(line, persons, index++);
            }
            System.out.println("Processed " + persons.length + " persons");
        } catch (Exception e) {
            System.err.println("Failed to read file: " + pFileName);
        }
    }

    private static void processLine(String csvRow, Person[] persons, int index) {
        if (csvRow == null || csvRow.isEmpty()) {
            return;
        }

        String[] data = csvRow.split(",");
        String name = data[0];
        int age = Integer.parseInt(data[1]);
        double time = Double.parseDouble(data[2]);

        persons[index] = new Person(name, age, time);
        //this is me testing
        System.out.println(persons[index]);
    }
}