CODEWITHSUNDEEP
javafileexception
John Doe
John Doe

Reputation: 211

ArrayIndexOutOfBoundsException when reading from a file

I have the following method that reads a file where it has an ID (int) and Content (String) separated by a tab. My method reads the file line by line, and using the tab delimiter, I parse the ID and the string into a doubly linked list like so: 

void readAndAssemble(String fileName)
    {
        Scanner sc;
        try
    {
        sc = new Scanner(new File(fileName));
        while (sc.hasNextLine())
        {
            String line = sc.nextLine();
            String lines[] = line.split("\t");
            int packetID = Integer.parseInt(lines[0]);
            // -----------------------------------------
            String packetContent = lines[1]; // gives error in terminal
            // -----------------------------------------
            DLLNode curr = header.getNext();
            DLLNode prev = header;
            while (packetID > curr.getPacketID())
            {
                prev = curr;
                curr = curr.getNext();
            } 
            DLLNode newNode = new DLLNode(packetID, packetContent, prev, curr);
            prev.setNext(newNode);
            curr.setPrev(newNode);

        }
        sc.close();
    } catch (FileNotFoundException e)
    {
        System.out.println("File does not exist");
    }

}

This method works perfectly in Eclipse when I run it, but gives me this error when I use javac and run it in terminal:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at DLL.readAndAssemble(DLL.java:40)
at MessageAssembler.main(MessageAssembler.java:11)

Where my MessageAssembler class looks like this:

public class MessageAssembler
{
    public static void main(String[] args)
    {
        DLL myDLL = new DLL();
        myDLL.readAndAssemble("Mystery3.txt");
        myDLL.printContent();
    }
}

What could be causing this?

Upvotes: 0

Views: 2058

Answers (1)

Scary Wombat
Scary Wombat

Reputation: 44854

It looks like you have lines in your file that do not conform to your understanding.

try doing

 String lines[] = line.split("\t");
 if (lines.length < 2) {
    System.err.println ("error with line " + line);
    continue;
 }

There seems to be a problem with using Scanner on a unix file

try

    FileInputStream fstream = new FileInputStream("c:/temp/a.txt");
    BufferedReader br = new BufferedReader(new InputStreamReader(fstream));

    String line;

    //Read File Line By Line
    while ((line = br.readLine()) != null)   {
      // Print the content on the console
      System.out.println (line);
      String [] lines = line.split ("\t");
      if (lines.length < 2) {
            System.err.println ("error with line " + line);
            continue;
         }        

    }

    //Close the input stream
    br.close();

Upvotes: 1

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