Duplicata Possível:
Como um programa Java pode usar arquivos dentro do .jar para leitura e gravação?

Como faço para gravar em um arquivo .txt de umJAR projeto compilado em java?

Quando executo meus projetos, ele não gera erros, mas simplesmente não grava no .txt dentro do arquivo JAR.

Eu faço o arquivo JAR usando:

netbeans clean /build tool

Código:

public class FileIO   {
    private File file;
    private Scanner filescScanner, lineScanner;
    private PrintWriter fileWriter;
    private String[][] data;

    public FileIO () {
        data = new String[100][2];
    }

    public String[][] getLineScores(){
        return this.loadHighscores(this.getClass().getResourceAsStream("LineHighscores.txt"));
    }

    public String[][] getTimeScores(){
        return this.loadHighscores(this.getClass().getResourceAsStream("TimeHighscores.txt"));
    }

    public void setLineScores( String name,String lines ){
        boolean found= false;
        data = this.getLineScores();
        for(int i = 0; i<data.length && !found ; i++){
            if(data[i][0] == null || "Niemand".equals(data[i][0])){
                data[i][0]=name;
                data[i][1]=lines;
                found=true;
            }
        }
        this.saveHighscores(this.getClass().getResource("LineHighscores.txt"),data);
    }

    public void setTimeScores(String time, String name){
        boolean found= false;
        data = this.getLineScores();
        for(int i = 0; i<data.length && !found ; i++){
            if(data[i][0] == null || "Niemand".equals(data[i][0])){
                data[i][0]=name;
                data[i][1]=time;
                found=true;
            }

        }
        this.saveHighscores(this.getClass().getResource("TimeHighscores.txt"),data);
    }

    private String[][] loadHighscores( InputStream resourceStream){
        int x=0;
        String test = "";
        try{
            filescScanner = new Scanner(resourceStream);
        }
        catch(Exception ioe){
            System.err.println(ioe);
        }

        if (filescScanner.hasNext()){
            while(filescScanner.hasNextLine()&& x<100) {
                lineScanner = new Scanner(filescScanner.nextLine());
                lineScanner.useDelimiter("-/-");

                data[x][0]=lineScanner.next();//name
                data[x][1]=lineScanner.next();//data
                x++;
            }
            lineScanner.close();
            filescScanner.close();
        }
        else{
            data[0][0] = "Niemand";
            data[0][1] = "0";
        }
        return data;
    }

    private void saveHighscores( URL resourceStream, String[][] data){
        int x=0;
        try {
            file = new File(resourceStream.toURI());
        } catch (URISyntaxException ex) {
            Logger.getLogger(FileIO.class.getName()).log(Level.SEVERE, null, ex);
        }

        try {
            fileWriter = new PrintWriter(file);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FileIO.class.getName()).log(Level.SEVERE, null, ex);
        }
        if(data.length>x){
            while(data.length>x && data[x][0] != null ){
                fileWriter.println(data[x][0]+"-/-"+data[x][1]);
                x++;
            }
            fileWriter.close();
        }
    }

    public static void main(String[] args){
        FileIO file = new FileIO();
        file.setLineScores("55555555", "KoenKevin");
    }
}