Array Out of Bounds reading File

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I’m having a problem with my code, in my text file I should read the last line is blank, and then it should not be read, however I’m getting out of Bounds.

Line for example file:

Fernando&60.9&166

Main class:

public static void main(String[] args) {
        ArrayList< Paciente > listaPacientes = new ArrayList< Paciente >(); 
        Paciente p = new Paciente();

        String filename = "F:\\NetBeansProjects\\IMC.txt";
        try {
            FileReader fr = new FileReader(filename);
            BufferedReader in = new BufferedReader(fr);
            String line = in.readLine();
            line = in.readLine();
            line = in.readLine();
            int a =4;
            while (line != null) {
                if(!line.startsWith(" ")){
                String result[] = line.split("&");
                listaPacientes.add(new Paciente(result[0], Double.parseDouble(result[1]), Integer.parseInt(result[2])));
                }
                line = in.readLine();
            }
            in.close();
        } catch (FileNotFoundException e) {
            System.out.println("Arquivo \"" + filename + "\" não existe.");
        } catch (IOException e) {
            System.out.println("Erro na leitura do arquivo " + filename + ".");
        }
java array
  • 2

    Check the contents of result in the Debugger, especially the size() (maybe putting a Watchpoint when it is less than 3). It may be that the data is not in the format you want. What actually shows a weakness of the algorithm. It is always possible to come something unexpected.

  • 2

    Without fixing the weaknesses @bigown pointed out, you could still check if the line isEmpty().

1 answer

2

If the goal is not to read the last blank line, the following statement can generate this exception:

listaPacientes.add(new Paciente(result[0], Double.parseDouble(result[1]), Integer.parseInt(result[2])));

Because the reading condition of the cycle, line != null, checks only if there are no more lines and if the "blank line" you refer to is an empty string "", then this error will even occur.

I suggest the next in the cycle:

while (line != null) {
   if(!line.trim().isEmpty()){
        ...
   }
   line = in.readLine();
}

The exception is java.lang.ArrayIndexOutOfBoundsException usually occurs when accessing an invalid position. Check the positions you access when adding new patients.

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