Changing JTable by ActionListener

Question

so I'm having trouble with my action listener for my JTable. Java isn't complaining so it's an error on my part. I'm trying to make a hotel management software.

I'm storing the rooms in a String array:

private String[][] rooms;
private String[] columnNames = { "Room Number" };

JTable results = new JTable(rooms, columnNames);

JScrollPane scrollPane = new JScrollPane(results);

And then my action listener:

searchButton.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            JsonReader reader = new JsonReader("assets/Rooms.txt");
            HotelRoom wanted = makeHotelRoomFromGuiInfo();
            String output = "";
            try {
                List<HotelRoom> allRooms = reader
                        .readHotelRoomObjectsFromFile();
                HotelRoomChooser chooser = new HotelRoomChooser(allRooms);
                List<HotelRoom> acceptable = chooser
                        .chooseRoomByPreferences(wanted);
                if (acceptable.size() == 0) {
                    output += "";
                } else {
                    for (int i = 0; i < acceptable.size(); i++) {
                        output += String.valueOf(acceptable.get(i)
                                .getRoomNumber())
                                + String.valueOf(acceptable.get(i)
                                        .getListOfOccupiedDates()) + ",";
                    }

                }
                for (int i = 0; i < output.length();){
                    rooms[i] = output.split(",");
                    i++;
                }

            } catch (IOException e1) {
                e1.printStackTrace();
            }

        }

Answer 1

Add after

for (int i = 0; i < output.length();){
   rooms[i] = output.split(",");
   i++;
}

results.setModel(new DefaultTableModel(rooms,columnNames )