How do I add a new row to an AbstractTableModel?

Question

I'm having an issue with adding new data to a table row. Every row I add contains the same data which is always the last data I grabbed from my database. I'm not sure if my issue has to do with how I set up the data to be passed or the table itself or both... Any help would be appreciated. It seems like the tablemodel is holding the memory spot ArrayList I'm passing. If I have to set up an arraylist of arraylists, to pass how do I do that?
My output is always:
1,4,Laser,10,120,100
1,4,Laser,10,120,100
1,4,Laser,10,120,100
1,4,Laser,10,120,100
Desired output:
1,1,Beam,10,99,100
1,2,Canon,10,120,100
1,3,Missile,10,66,100
1,4,Laser,10,120,100
     * Extract weaponIDs by hullType from weapon database
private void setWeapons(int hullType){
// equpModel is the tableModel
    equipModel.clearTable();
    Weapon tempWeapon = new Weapon();
    ArrayList newData = new ArrayList();
    for (Iterator <Weapon> i = dataBaseManager.weaponList.iterator(); i.hasNext(); ){
        tempWeapon = i.next();
        if (tempWeapon.weaponClass == hullType){
            newData.add(0,1);
            newData.add(1,tempWeapon.weaponID);
            newData.add(2,tempWeapon.weaponName);
            newData.add(3,tempWeapon.weaponCps);
            newData.add(4,tempWeapon.weaponMass);
            newData.add(5,tempWeapon.weaponCost);
            equipModel.insertRow(newData);
}Here is a snipet from the table class
public class GenTableModel extends AbstractTableModel {
  private ArrayList data; // Holds the table data
  private String[] columnNames; // Holds the column names.
   * Constructor: Initializes the table structure, including number of columns
   * and column headings. Also initializes table data with default values.
   * @param columnscolumns[] array of column titles.
   * @param defaultvdefaultv array of default value objects, for each column.
   * @param rowsrows number of rows initially.
  public GenTableModel(String[] columns, Object[] defaultv, int rows) {
    // Initialize number of columns and column headings
    columnNames = new String[ columns.length ];
    for(int i = 0; i < columns.length; i++) {
      columnNames [ i ] = new String(columns [ i ]);
    // Instantiate Data ArrayList, and fill it up with default values
    data = new ArrayList();
    for(int i = 0; i < rows; i++) {
      ArrayList cols = new ArrayList();
      for(int j = 0; j < columns.length; j++) {
        cols.add(defaultv [ j ]);
      data.add(cols);
   * Adds a new row to the table.
   * @param newrowArrayList new row data
  public void insertRow(ArrayList newrow) {     
    data.add(newrow);
    super.fireTableDataChanged();
   * Clears the table data.
  public void clearTable() {
    data = new ArrayList();
    super.fireTableDataChanged();
}

Answer 1

Hi thanks again for responding
Here is the Initialization, including the panel and scrollpane it sits on.
      // Table attempt
        JPanel tablePanel = new JPanel(new BorderLayout());
        tablePanel.setBounds(PANEL_X+2*PANEL_DISTANCE, PANEL_Y, PANEL_WIDTH+300, PANEL_HEIGHT);
        title = BorderFactory.createTitledBorder(blackLine, "Table List");
        tablePanel.setBorder(title);
// This is column tile plus one dummy initilization set.
        String[] columnNames = {"DB", "ID", "Name", "CPS", "Energy", "Mass", "Cost"};
        Object[] data = {new Integer(0),new Integer(0), "Empty", new Integer(0),
                    new Integer(0),new Integer(0),new Integer(0)};
// here is the GenTableModel creation
        equipModel = new GenTableModel(columnNames, data, 1);
        equipmentTable = new JTable(equipModel);
        equipmentTable.setRowSelectionAllowed(true);
        equipmentTable.setFillsViewportHeight(true);
        equipmentTable.setColumnSelectionAllowed(false);
        TableColumn column = null;
        column = equipmentTable.getColumnModel().getColumn(0);
        column.setPreferredWidth(20);
        column = equipmentTable.getColumnModel().getColumn(1);
        column.setPreferredWidth(20);
        JScrollPane scrollPane = new JScrollPane(equipmentTable);
        tablePanel.add(scrollPane);
        add(tablePanel);
    Here is the full code for GenTableModel. It is as you guessed.
public class GenTableModel extends AbstractTableModel {
  private ArrayList data; // Holds the table data
  private String[] columnNames; // Holds the column names.
  public GenTableModel(String[] columns, Object[] defaultv, int rows) {
    // Initialize number of columns and column headings
    columnNames = new String[ columns.length ];
    for(int i = 0; i < columns.length; i++) {
      columnNames [ i ] = new String(columns [ i ]);
    // Instantiate Data ArrayList, and fill it up with default values
    data = new ArrayList();
    for(int i = 0; i < rows; i++) {
      ArrayList cols = new ArrayList();
      for(int j = 0; j < columns.length; j++) {
        cols.add(defaultv [ j ]);
      data.add(cols);
  public int getColumnCount() {
    return columnNames.length;
  public int getRowCount() {
    return data.size();
  public String getColumnName(int col) {
    return columnNames [ col ];
  public Object getValueAt(int row, int col) {
    ArrayList colArrayList = (ArrayList) data.get(row);
    return colArrayList.get(col);
  public Class getColumnClass(int col) {
    // If value at given cell is null, return default class-String
    return getValueAt(0, col) == null ? String.class
                                      : getValueAt(0, col).getClass();
  public void setValueAt(Object obj, int row, int col) {
    ArrayList colArrayList = (ArrayList) data.get(row);
    colArrayList.set(col, obj);
  public void insertRow(ArrayList newrow) {     
    data.add(newrow);
    super.fireTableDataChanged();
  public void deleteRow(int row) {
    data.remove(row);
    super.fireTableDataChanged();
  public void deleteAfterSelectedRow(int row) {
    int size = this.getRowCount();
    int n = size - (row + 1);
    for(int i = 1; i <= n; i++) {
      data.remove(row + 1);
    super.fireTableDataChanged();
  public ArrayList getRow(int row) {
    return (ArrayList) data.get(row);
  public void updateRow(ArrayList updatedRow, int row) {
    data.set(row, updatedRow);
    super.fireTableDataChanged();
  public void clearTable() {
    data = new ArrayList();
    super.fireTableDataChanged();
}