Exemplo de JTable no site imasters

public class ExemploJTable extends javax.swing.JFrame {
    
    /** Creates new form ExemploJTable */
    public ExemploJTable() {
        
        String[] sexos = {"M","F"};
        scmbSexo = new javax.swing.JComboBox(sexos);
        initComponents();
        /**
        * Este evento adiciona uma linha vazia na tabela
        *
        */
        bMais.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent e) {
                javax.swing.table.DefaultTableModel dtm = (javax.swing.table.DefaultTableModel)table.getModel();
                dtm.addRow(new Object[]{"","","","",""});
          }
        });

        /**
        * Este evento exclui as linhas vazias que foram selecionadas na tabela
        *
        */
        bMenos.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent e) {
                int[] l = table.getSelectedRows();
                javax.swing.table.DefaultTableModel dtm = (javax.swing.table.DefaultTableModel)table.getModel();

                for(int i = (l.length-1); i >= 0; --i) {
                  if("".equals(table.getValueAt(l[i],1).toString().trim())) {
                    dtm.removeRow(l[i]);

                  }
                }
          }
        });         
        
    }
    
    /** 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.
     */
    private void initComponents() {                          
        bAdd = new javax.swing.JPanel();
        pnTable = new javax.swing.JPanel();
        scrollTable = new javax.swing.JScrollPane();
        table = new javax.swing.JTable();
        bMenos = new javax.swing.JButton();
        bMais = new javax.swing.JButton();
        jButton1 = new javax.swing.JButton();
        bDelete = new javax.swing.JButton();

        setTitle("Exemplo JTable imasters");
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });

        bAdd.setLayout(null);

        pnTable.setLayout(new java.awt.GridLayout(1, 0));

        pnTable.setBorder(new javax.swing.border.TitledBorder("Exemplo de JTable"));
        table.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] { },
            new String [] {
                " ","Nome", "Telefone","email","Sexo"
            }
        )
        {}
    );
    table.getColumnModel().getColumn(0).setPreferredWidth(10);
    table.getColumnModel().getColumn(0).setResizable(false);
    table.getColumnModel().getColumn(1).setPreferredWidth(150);
    table.getColumnModel().getColumn(1).setResizable(true);
    table.getColumnModel().getColumn(2).setPreferredWidth(60);
    table.getColumnModel().getColumn(2).setResizable(true);
    table.getColumnModel().getColumn(3).setPreferredWidth(160);
    table.getColumnModel().getColumn(3).setResizable(true);
    table.getColumn(table.getColumnName(4)).setCellEditor(new javax.swing.DefaultCellEditor(scmbSexo));
    table.getColumnModel().getColumn(4).setPreferredWidth(30);
    table.getColumnModel().getColumn(4).setResizable(true);
    table.getTableHeader().setReorderingAllowed(false);
    table.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
    scrollTable.setViewportView(table);

    pnTable.add(scrollTable);

    bAdd.add(pnTable);
    pnTable.setBounds(10, 10, 370, 230);

    bMenos.setText("-");
    bAdd.add(bMenos);
    bMenos.setBounds(400, 110, 40, 40);

    bMais.setText("+");
    bAdd.add(bMais);
    bMais.setBounds(400, 60, 40, 40);

    jButton1.setText("Add");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    bAdd.add(jButton1);
    jButton1.setBounds(390, 180, 60, 23);

    bDelete.setText("Del");
    bDelete.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            bDeleteActionPerformed(evt);
        }
    });

    bAdd.add(bDelete);
    bDelete.setBounds(390, 210, 60, 23);

    getContentPane().add(bAdd, java.awt.BorderLayout.CENTER);

    java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
    setBounds((screenSize.width-474)/2, (screenSize.height-283)/2, 474, 283);
    }                        

    private void bDeleteActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        int[] l = table.getSelectedRows();
        javax.swing.table.DefaultTableModel dtm = (javax.swing.table.DefaultTableModel)table.getModel();

        for(int i = (l.length-1); i >= 0; --i)
            dtm.removeRow(l[i]);
    }                                       

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        javax.swing.table.DefaultTableModel dtm = (javax.swing.table.DefaultTableModel)table.getModel();
        dtm.addRow(new Object[]{" ","Almedson Ferreira","1111111","[email removido]","M"});
    }                                        
    
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {                          
        System.exit(0);
    }                         
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        new ExemploJTable().show();
    }
    
    private javax.swing.JComboBox scmbSexo;
    // Variables declaration - do not modify                     
    private javax.swing.JPanel bAdd;
    private javax.swing.JButton bDelete;
    private javax.swing.JButton bMais;
    private javax.swing.JButton bMenos;
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel pnTable;
    private javax.swing.JScrollPane scrollTable;
    private javax.swing.JTable table;
    // End of variables declaration                   
    
}