Java 此程序从文件中读取数据，并按指定添加和删除记录

我得到了这个错误，但我真的不知道这意味着什么，我如何才能摆脱错误。该程序在读取输入文件后，按照输入文件中的规定添加和删除记录。然后，它将输出写入另一个文件

错误：

java.lang.NumberFormatException: For input string: "1   Acconci"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at ReadArtistList.getList(ReadArtistList.java:23)
at UpdateArtistList.<init>(UpdateArtistList.java:12)
at p3a.main(p3a.java:9)

UpdaterAtistList.java：

import java.io.*;
//import java.lang.*;

public class UpdateArtistList
{
 private ArtistList t;
 public UpdateArtistList()
  {
   try
    {
       t = new ReadArtistList().getList();
        BufferedReader reader = new BufferedReader(new InputStreamReader(new            FileInputStream("C:/Users/patel/Desktop/JavaFiles/p2changes.txt")));
        String line = reader.readLine();
        while (line != null)
        {
            //splitting file by comma
            String[] array = line.split(" ");
            //checking the string of whether it is for adding new item or deleting an item
            if(array[0].equals("A") || array[0].equals("a"))
            {
               t.add(array[1]);
            }
            else if(array[0].equals("D") || array[0].equals("d"))
            {
                //iterating through array for finding an item to delete
                 t.delete(Integer.parseInt(array[1]));
            }
            line = reader.readLine();
        }
        reader.close();

    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
    }
           public ArtistList getUpdatedList()
             {
               return t;
            }
           }

  import java.io.*;
 import java.lang.*;
 public class ReadArtistList
 {
   /*   public ReadArtistList()
    {

   }
     */   public ArtistList getList()
    {
         ArtistList a=new ArtistList();
      try
        {
        //reading from file "items.txt"

        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("C:/Users/patel/Desktop/JavaFiles/p1artists.txt")));
        String line = reader.readLine();
        while (line != null)
        {
            //splitting file by comma
            String[] array = line.split(" ");
            a.addNode(Integer.parseInt(array[0]),array[1]);
            line = reader.readLine();
        }
        reader.close();
        //return a;
    }
    catch(Exception e)
    {
       e.printStackTrace();
    }
    return a;
        }

           }

ReadArtistList.java：

import java.io.*;
//import java.lang.*;

public class UpdateArtistList
{
 private ArtistList t;
 public UpdateArtistList()
  {
   try
    {
       t = new ReadArtistList().getList();
        BufferedReader reader = new BufferedReader(new InputStreamReader(new            FileInputStream("C:/Users/patel/Desktop/JavaFiles/p2changes.txt")));
        String line = reader.readLine();
        while (line != null)
        {
            //splitting file by comma
            String[] array = line.split(" ");
            //checking the string of whether it is for adding new item or deleting an item
            if(array[0].equals("A") || array[0].equals("a"))
            {
               t.add(array[1]);
            }
            else if(array[0].equals("D") || array[0].equals("d"))
            {
                //iterating through array for finding an item to delete
                 t.delete(Integer.parseInt(array[1]));
            }
            line = reader.readLine();
        }
        reader.close();

    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
    }
           public ArtistList getUpdatedList()
             {
               return t;
            }
           }

  import java.io.*;
 import java.lang.*;
 public class ReadArtistList
 {
   /*   public ReadArtistList()
    {

   }
     */   public ArtistList getList()
    {
         ArtistList a=new ArtistList();
      try
        {
        //reading from file "items.txt"

        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("C:/Users/patel/Desktop/JavaFiles/p1artists.txt")));
        String line = reader.readLine();
        while (line != null)
        {
            //splitting file by comma
            String[] array = line.split(" ");
            a.addNode(Integer.parseInt(array[0]),array[1]);
            line = reader.readLine();
        }
        reader.close();
        //return a;
    }
    catch(Exception e)
    {
       e.printStackTrace();
    }
    return a;
        }

           }

---

p3a第9行的NumberFormatException是创建对象的位置。该错误还表示Integer.parseInt正在运行。请执行以下操作： 1.调试堆栈跟踪。

---

2.在第三个类中，如果要拆分数组，请将其包装在包含parseInt的try-catch块中，或者在拆分后打印数组。你会明白怎么了。还有，你真的是用逗号分开的吗？您的备注和代码在该行中不正确。

什么是NumberFormatException，我如何修复它？-->stacktrace告诉您错误发生的行，消息告诉您无效输入和错误发生的原因。剩下的问题可以通过几分钟的谷歌搜索和调试来解决。提示：用于搜索的关键字将是NumberFormatException和Integer.ParseInt。它的可能重复项正在第9行打印p3a的数字格式异常。这是您实例化更新文章列表类的地方。我建议调试堆栈跟踪，看看哪个类行为不正常。另外，在分析数组未读文章列表期间似乎出现错误。将其包装在try-catch块中，或者在拆分后打印数组，以查看得到的结果。