CODEWITHSUNDEEP
javaoutputbufferedreader
coinbird
coinbird

Reputation: 1217

Scanner won't read the next line from a file. JAVA

Like the title says, I can get it to write the first thing to the file I want it to, but after that it doesn't write any more. I run it through the debugger, and see that it's not even reading the next line (I know this because it's not filling the array.) I tried manually advancing the pointer (I don't know if that's actually a thing you can do) at the end of the loop with "line = in.readline;", but It just throws a "nosuchelement" exception. Here's my try block"

try
  {
     in = new BufferedReader(new FileReader("lab7input.txt"));

     outNormal = new PrintWriter(new File("normal.txt"));
     outVegetarian = new PrintWriter(new File("vegetarian.txt"));
     outPescetarian = new PrintWriter(new File("pescetarian.txt"));
     outInvalid = new PrintWriter(new File("invalid.txt"));

     String line = in.readLine();
     StringTokenizer st = new StringTokenizer(line);

     while (line != null)
     {
        Scanner sc = new Scanner(line);
        while(sc.hasNext())
        {
            if(st.countTokens() == 3)
            {
                attendee3[0] = sc.next();
                attendee3[1] = sc.next();
                attendee3[2] = sc.next();

                if(Integer.parseInt(attendee3[2]) == 0)
                {
                    outNormal.println(attendee3[0] + " " + attendee3[1]);
                    outNormal.close();
                }
                else if(Integer.parseInt(attendee3[2]) == 1)
                {
                    outVegetarian.println(attendee3[0] + " " + attendee3[1]);
                    outVegetarian.close();
                }
                else if(Integer.parseInt(attendee3[2]) == 2)
                {
                    outPescetarian.println(attendee3[0] + " " + attendee3[1]);
                    outPescetarian.close();
                }
                else
                {
                    outInvalid.println(attendee3[0] + " " + attendee3[1]);
                    outInvalid.close();
                }
            }  
            if(st.countTokens() == 4)
            {
                attendee4[0] = sc.next();
                attendee4[1] = sc.next();
                attendee4[2] = sc.next();

                if(Integer.parseInt(attendee4[3]) == 0)
                {
                    outNormal.println(attendee4[0] + " " + attendee4[1] + " " + attendee4[2]);
                    outNormal.close();
                }
                else if(Integer.parseInt(attendee4[3]) == 1)
                {
                    outVegetarian.println(attendee4[0] + " " + attendee4[1] + " " + attendee4[2]);
                    outVegetarian.close();
                }
                else if(Integer.parseInt(attendee4[3]) == 2)
                {
                    outPescetarian.println(attendee4[0] + " " + attendee4[1] + " " + attendee4[2]);
                    outPescetarian.close();
                }
                else
                {
                    outInvalid.println(attendee4[0] + " " + attendee4[1] + " " + attendee4[2]);
                    outInvalid.close();
                }
            }
            //line = in.readLine();
        }
     }
  }

Upvotes: 1

Views: 1852

Answers (3)

Squirrel in training
Squirrel in training

Reputation: 788

Not only that, i've had the experience that Scanner can only read in UTF-8 codeded .txt files. so always make sure that they are UTF-8 coded.
If they are not just simply open the file and save it with that coding.

Upvotes: 0

Mitja
Mitja

Reputation: 43

You have to put line = in.readLine() one block below and not in a while block of a scanner.

Upvotes: 1

Scary Wombat
Scary Wombat

Reputation: 44824

a simpler and cleaner way would be

 String line = in.readLine();

 while (line != null)
 {
    String arr [] = line.split ();
    if(arr.length == 3)
    {
            attendee3[0] = arr[0];
            attendee3[1] = arr[1];
            attendee3[2] = arr[2];
    }
   // other count code

   line = in.readLine();
 }

Upvotes: 1

Related Questions