java - 在 java 中将 CSV 复制到数组时遇到问题

Question

所以这是我第一次尝试做这样的事情，我一直在网上从各种来源收集有关如何正确执行此操作的信息。到目前为止，我已经编写了一段代码，我相信它能够完成工作。但是，每当我单击“运行”时，程序都会终止并打印此错误:

Exception in thread "main" java.lang.NumberFormatException: For input string: "Version,1.4.0"
    at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1241)
    at java.lang.Double.parseDouble(Double.java:540)
    at IO_CSV.setUpMyCSVArray(IO_CSV.java:47)
    at IO_CSV.main(IO_CSV.java:82)

这是我的代码:

import java.io.BufferedReader;
import java.io.FileReader;
import java.text.NumberFormat;
import java.util.Scanner;
import java.io.FileNotFoundException;


public class IO_CSV {

    static String xStrPath;
    static double[][] myArray;
    NumberFormat nf = NumberFormat.getInstance();

    static void setUpMyCSVArray()
    {
        myArray = new double[3000][3000];

        Scanner scanIn = null;
        int RowC= 0;
        int Row = 0;
        int ColC = 0;
        int Col = 0;
        String InputLine = " ";
        String xfileLocation;


        xfileLocation = "/Users/victorgarcia/Documents/reza_data1.csv"; 



        try
        {
            //setup scanner
            scanIn = new Scanner(new BufferedReader(new FileReader(xfileLocation)));

            //while ((InputLine = scanIn.nextLine()) != null)
            while(scanIn.hasNextLine())
            {
                //read line in from file
                InputLine = scanIn.nextLine();
                //split the InputLine into an array at the commas
                String[] InArray = InputLine.split(",,,");

                //copy the content of the inArray to the myArray
                for(int x = 0; x< InArray.length; x++)
                {
                    myArray[RowC][x] = Double.parseDouble(InArray[x]);
                }
                //increment the row in the array
                RowC++;
            }

        }
        catch (FileNotFoundException e)
        { 
            System.out.println(e);
        }

    }





static void printMyArray()
{
    for (int RowC=0; RowC<3000; RowC++)
    {
        for (int ColC=0; ColC<3000; ColC++)
        {
            System.out.print(myArray[RowC][ColC]+ " ");
        }
        System.out.println();
    }

    return;
}


public static void main(String[] args)
{
    setUpMyCSVArray();


}
}

希望有人能回答我做错了什么

Answer 1

在此代码中，您假设 CSV 中的所有值都可以解析为 double。字符串“Version,1.4.0”的情况并非如此，它显然出现在您的文件中。要捕获此问题并记录该值无法解析为 double 的所有其他情况，您可以像这样更改代码:

try
{
    myArray[RowC][x] = Double.parseDouble(InArray[x]);
}
catch (NumberFormatException nfe)
{
    System.out.println("Unable to parse at " + rowC + ", " + x + ": " + InArray[x]);
}