InputMismatchException in a scanner to get data from txt file

Question

I'm trying to read the highscores of a game from a txt file and put them into an array so that another section of the program can detect a high score. Earlier I had everything declared as Int and it worked fine but I wanted more precision so I decided to have everything as long to calculate decimals as well. However, when I changed from int to long this error appeared. I've looked for solutions and none works for me. Could anyone please take a look?

For reference, the txt file contains

95,0
1,0
1,0

The error "Exception in thread "AWT-EventQueue-0" java.util.InputMismatchException" comes up at line 74, which is

top3[i] = scanner.nextLong();

despite the fact that top3 is declared as long.

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

public class WriteHighScore {
    
    public static double[] top3 = new double[6];
    public static boolean newTop3 = false;
        
        public static void RewriteFile(double[] top3, boolean append) throws IOException {
            
            //File file1 = new File(fileName);
            //System.out.println("iniziando a riscrivere il file");
            File file1 = new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore", "highscores.txt");
                        
            FileWriter fw = new FileWriter(file1, append);
            
            PrintWriter pw = new PrintWriter(fw);
            
            //le tre linee sotto cancellano tutto
            FileOutputStream writer = new FileOutputStream("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\highscores.txt");
            writer.write(("").getBytes());
            writer.close(); 
            
            //qui scrive il file nuovo
            for (int i = 0; i < 3; i++) {
                pw.println(top3[i]); 
            }
            
            pw.close();
            
        }
        
        public static void AvgRewriteFile(double[] top3, boolean append) throws IOException {
            
            //File file1 = new File(fileName);
            //System.out.println("iniziando a riscrivere il file");
            File file1 = new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore", "averagehighscore.txt");
                        
            FileWriter fw = new FileWriter(file1, append);
            
            PrintWriter pw = new PrintWriter(fw);
            
            //le tre linee sotto cancellano tutto
            FileOutputStream writer = new FileOutputStream("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\averagehighscore.txt");
            writer.write(("").getBytes());
            writer.close(); 
            
            //qui scrive il file nuovo
            for (int i = 3; i < 6; i++) {
                pw.println(top3[i]); 
            }
            
            pw.close();
            
        }

    public static double[] main(double punti, double avgPunti) throws IOException {
        
        //System.out.println("sono in writehighscore");
        
        //in teoria sta cosa guarda che non si siano fine e ne crea uno se non c'è
        File file = new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\highscores.txt");
        //if (!file.exists()) {saveToFile(punti, true); System.out.println("ho scritot i punti nel file");}
                        
        //questa roba legge il file e lo mette in un array
        Scanner scanner = new Scanner(new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\highscores.txt"));
        
        for (int i = 0; i < 3; i++) {
        
            top3[i] = scanner.nextLong(); //qui scrive

        } 
        
        double exTop = 0;
        double exSecondo = 0;
        //System.out.println("sto iniziando a controllare i valori con punti = " + punti);
        if (top3[0] < punti) {exTop =top3[0]; top3[0] = punti; newTop3 = true;} else {exTop =  punti;}
        if (top3[1] < exTop) {exSecondo = top3[1]; top3[1] = exTop; newTop3 = true;} else {exSecondo = exTop;}
        if (top3[2] < exSecondo) {top3[2] = exSecondo; newTop3 = true;}
        
        if (file.exists()) {RewriteFile(top3, true);}
        
        File file2 = new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\averagehighscore.txt");
        Scanner scanner2 = new Scanner(new File("C:\\Users\\39340\\Desktop\\storageapp\\highscore\\averagehighscore.txt"));

        for (int i = 3; i < 6; i++) {
            
            top3[i] = scanner2.nextInt(); //qui scrive
            //System.out.println("sto scrivendo nella top3. qui vale"+top3[i]);
            //System.out.println("2top3 "+top3[i]);
        }
        
        double exAvgTop = 0;
        double exAvgSecondo = 0;
                
        //System.out.println("sto iniziando a controllare i valori con punti = " + punti);
        if (top3[3] < avgPunti) {exAvgTop = top3[3]; top3[3] = avgPunti; newTop3 = true;} else {exAvgTop = avgPunti;}

        if (top3[4] < exAvgTop) {exAvgSecondo = top3[4]; top3[4] = exAvgTop; newTop3 = true;} else {exAvgSecondo = exAvgTop;}

        if (top3[5] < exAvgSecondo) {top3[5] = exAvgSecondo; newTop3 = true;}

        if (file.exists()) {AvgRewriteFile(top3, true);}
        
        if (newTop3 = true) {return top3;} else return null;

}

}

Answer 1

You get the InputMismatchException exception because you are trying to read the string 95,0 as a long value. But a long number does not have a , character in it. As you used pw.println(top32[i]); previously, where top32[] is a double array, it was written as a double value in the file, with the , character.

Depending on what you want to do you can change it in a way that the value is written in the file as a long/int value by casting the value before writing it to the file or you can use nextDouble() to read the value as a double value and then cast it to long/int where needed.