Prosze o pomoc z tabela

Próbuje zrobic tabele na netBeans JFrameForm nie pisze kodu tylko korzystam z Design.
Moj caly kod wyglada tak

package tabela;

/**
*

• @Author luppo
  */
  public class Tabelka extends javax.swing.JFrame {

  /** Creates new form Tabelka */
  public Tabelka() {
  initComponents();
  }

  /** This method is called from within the constructor to

  • initialize the form.

  • WARNING: Do NOT modify this code. The content of this method is

  • always regenerated by the Form Editor.
    */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jScrollPane1 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
    new Object [][] {
    {null, null, null, null, null, null},
    {null, null, null, null, null, null},
    {null, null, null, null, null, null},
    {null, null, null, null, null, null},
    {null, null, null, null, null, null},
    {null, null, null, null, null, null}
    },
    new String [] {
    "Nazwisko", "Title 2", "Title 3", "Title 4", "Title 5", "Title 6"
    }
    ) {
    Class[] types = new Class [] {
    java.lang.Double.class, java.lang.Object.class, java.lang.Object.class, java.lang.Object.class, java.lang.Object.class, java.lang.Double.class
    };

     public Class getColumnClass(int columnIndex) {
         return types [columnIndex];
     }
    

    });
    jScrollPane1.setViewportView(jTable1);

    jButton1.setText("jButton1");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(jPanel1Layout.createSequentialGroup()
    .addContainerGap()
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(jPanel1Layout.createSequentialGroup()
    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
    .addContainerGap())
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
    .addComponent(jButton1)
    .addGap(159, 159, 159))))
    );
    jPanel1Layout.setVerticalGroup(
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
    .addContainerGap(63, Short.MAX_VALUE)
    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addGap(39, 39, 39)
    .addComponent(jButton1)
    .addGap(230, 230, 230))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addContainerGap()
    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    .addContainerGap())
    );
    layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    pack();
    }// </editor-fold>

  /**

  • @param args the command line arguments
    */
    public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new Tabelka().setVisible(true);
    }
    });
    }

  // Variables declaration - do not modify
  private javax.swing.JButton jButton1;
  private javax.swing.JPanel jPanel1;
  private javax.swing.JScrollPane jScrollPane1;
  private javax.swing.JTable jTable1;
  // End of variables declaration

}

Nie wiem jakiej komendy uzyć zeby pobrac wartosc liczbowa z danej kolumny

Object a = jTable1.getValueAt(0, 0);

0 i 0 to kolejno indeksy wiersza i kolumny :)