How to change FileOutputStream to class.getResource()

Code:

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public class HighScores {
       
    //Inner class, Score.
        class Score implements Comparable<Score> {
                String name;
                int score;
               
                //Constructs scores from text file.
                Score(StreamTokenizer stream) throws IOException {
                        if (stream.ttype != StreamTokenizer.TT_WORD) {
                                System.err.println("Expected highscore name value in highscores.txt not found. "+stream.lineno());
                                System.exit(1);
                        }
                       
                        name = stream.sval;
                       
                        stream.nextToken();
                        if (stream.ttype != StreamTokenizer.TT_NUMBER) {
                                System.err.println("Expected number in highscores.txt not found: "+stream.sval+", line: "+stream.lineno());
                                System.exit(1);
                        }
                        score = (int) stream.nval;
                        stream.nextToken();
                }
               
                public Score(String n, int s) {
                        name = n;
                        score = s;
                }

                @Override
                public String toString() {
                        return name+" "+score;
                }

                @Override
                public int compareTo(Score o) {
                        return ((Integer) o.score).compareTo((Integer) score);
                }
        }
       
        ArrayList<Score> scores;
       
        public HighScores(String filename) {
               
                StreamTokenizer stream = null;
                try {
                        stream = new StreamTokenizer(new BufferedReader(new InputStreamReader(new FileInputStream(filename))));
                } catch (FileNotFoundException e1) {
                        System.err.println("File not found '"+filename+"'");
                        e1.printStackTrace();
                        System.exit(1);
                }
               
                scores = new ArrayList<Score>();
                try {
                        parse(stream);
                } catch (IOException e) {
                        System.err.println("IO exception while reading file "+filename);
                        e.printStackTrace();
                        System.exit(1);
                }
        }
       
        //Parse the text of the highscore file.
        void parse(StreamTokenizer stream) throws IOException {
                stream.nextToken();
                if (!(stream.ttype == StreamTokenizer.TT_WORD && stream.sval.equals("begin"))) {
                        System.err.println("Expected token \"begin\" not found: "+stream.sval+", line: "+stream.lineno());
                        System.exit(1);
                }
                stream.nextToken();
                while (!(stream.ttype == StreamTokenizer.TT_WORD && stream.sval.equals("end"))) {
                        scores.add(new Score(stream));
                }
        }
       

       
        @Override
        public String toString() {
                Collections.sort(scores);
                String rtn = "";
                for (Score s:scores)
                        rtn += "  " +s+ "\n";
                return rtn;
        }
       
        //Add a score to the highscore list if it is larger than any one of the old scores.
        public void addScore(String name, int score) throws IOException{
               
                Score scoreToReplace = null;
                Boolean hasScoreReplaceValue = false;
                for (Score s : scores){
                        if (score > s.score && hasScoreReplaceValue == false){
                                hasScoreReplaceValue = true;
                        scoreToReplace = s;}
                        }
               
                if (scoreToReplace != null){
                scores.add(scores.indexOf(scoreToReplace), new Score(name, score));
                scores.remove(scoreToReplace);
               
                try {
                        FileOutputStream out = new FileOutputStream("src/Teeter/highscores.txt");
                        out.write("begin".getBytes());
                        for (Score s : scores){
                                out.write((" "+s.name+" "+s.score+" ").getBytes());
                        }
                        out.write("end".getBytes());
                        out.flush();
                       
                } catch (FileNotFoundException e) {
                        System.err.println("Error. highscores.txt not found.");
                        e.printStackTrace();
                }
                }

---

FileOutputStream out = new FileOutputStream("src/Teeter/highscores.txt");

I know that in order to run this with jar file, I must change it to class.getResources() method but I just don't know to change this. What can be the good way to change this? Please... [when I compress this into jar file I must create the folder ('Teeter') and put jar file with src folder and then put highscores.txt into that src folder. I just want it to be compiled by just operating jar file.

The jar archive is meant for program resources - that is things that don't change and are read by the program. I don't think there is any standard way of the program changing the contents of the jar.