output newline to CSV file how to

[Dustin Schreader]

I would like to enter a new item into a CSV file but all my items being entered are all staying on one line in the CSV file. I would like each new item to show up on a new line and I can't seem to find the code to make it work. I've tried the \n and that didn't work.

  public String addItem(String newItem, int credits, String code) 
  {
    
    String money = Integer.toString(credits);
    
    try {
      BufferedReader itemsCSV =
        new BufferedReader(new FileReader("itemList.csv"));
    
      String dataRow = itemsCSV.readLine();
      
      String[] rows = new String[1];
      String[] dataArray = new String[11];
  
  
      while (dataRow != null){
      
        for(int x = 0; x < 1; x++){
      
          dataArray = dataRow.split("\n");
          rows[x] = dataArray[0];
     
          dataRow = itemsCSV.readLine(); // Read next line of data.
      
        }
      }
    
      FileWriter writer = new FileWriter("itemList.CSV");
      
      for(int p = 0; p<rows.length; p++){
        writer.append(rows[p]);
      }
      
      writer.append(code);
      writer.append(',');
      writer.append(newItem);
      writer.append(',');
      writer.append(money);
      writer.append(',');
      writer.append(howManyItems);
      writer.append(',');
      writer.append('\n');   //<=======This doesn't work
 
      writer.flush();
      writer.close();
    }
    catch(IOException e)
    {
      e.printStackTrace();
    } 
    
    return "new item: " + newItem + " added";
    
  }

[Campbell Ritchie]

You probably don’t need to call flush(); if you look here, you will find out why.
There are methods in the BufferedWriter class which can help with new lines. You are better off buffering your FileWriter with a BufferedWriter. There is an example in the BufferedWriter API. BufferedWriter has a write() method which writes a String, but I think you would do better to put all your Strings together with a StringBuilder, and call its toString() method. That is because you get better performance with fewer calls to access the file. Write one line at a time rather than one word at a time.