Need to remove multiple commas at end of line in java

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Im trying to remove all commas at the end of line in a text file. It can have 0,1,2 or 3 commas at the end.

here is my code but its throwing index out of range -1 exception. I don't understand why since I only remove the commas at the end. I also tried with regex but its not working.

 BufferedReader reader = null;
    Writer writer = null;
    try { 
        reader = new BufferedReader(
                new InputStreamReader(
                        new FileInputStream(
                                "C:\\Users\\admin\\Desktop\\test.txt"))); //INPUT FILE

        writer = new BufferedWriter(new FileWriter(
                "C:\\Users\\admin\\Desktop\\fixedlist.txt"));
        String line = null;
        while ((line = reader.readLine()) != null) {
            //line.replaceAll(" ,$", ""); //tried this regex with no luck
            while (line.endsWith(",")){
                    line = line.substring(0, line.length()-1);
            }

            String line1 = line.substring(0, line.indexOf(",")); //throws StringIndexOutOfBoundsException: String index out of range: -1
            String line2 = line.substring(line.indexOf(",") + 1,
                    line.length());
            writer.write("\"" + line1 + "\"" + "," + "\"" + line2 + "\""
                    + "\n");

asked 50 secs ago

user2245622

1

Need to remove multiple commas at end of line in java