Loading score for a game

Question

In the game that I am currently working on I want to make it so that when you start the game you get the previous score you had befor you quit. I have already made a save file for the score with this code.

                try{
                    File getScore = new File("Score.dat");
                    FileOutputStream scoreFile = new FileOutputStream(getScore);
                    byte[] saveScore = score.getBytes();
                    scoreFile.write(saveScore);
                }catch(FileNotFoundException ex){

                }catch(IOException ex){

                }

The score is displayed as a String so therefor upon start the game have to get the score inside the .dat file as an string so that I can equal the score string to the string that was generated upon start. I have tried using the code shown below.

        try{
            BufferedReader br = new BufferedReader(new FileReader("Score.dat"));
            score = br.toString();
        }catch (FileNotFoundException ex){

        }

But when I use that code I get this error message.

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "java.io.BufferedReader@313159f1"

Answer 1

If you do br.toString() , it calls the toString() method from the class object on your BufferedReader object. So it prints the memory adress of your buffered object :

public String toString() {
           return getClass().getName() + "@" + Integer.toHexString(hashCode());
 } 

That's why you get a NumberFormatException because you can't assign a String to score (which I suppose is an int variable).

Furthermore, you are absolutely not looking for that because you want the text stored in your file. If you want to read a single line from your buffer you just have to do this :

 String line = br.readLine();
    int value = Integer.parseInt(line);