JTable problem

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package testlist;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.DefaultTableModel;


/**
 *
 * @author Evangelion-01
 */
public class TableTestFinal extends javax.swing.JFrame implements ListSelectionListener{

    /**
     * Creates new form TableTestFinal
     */

    private JTable maTable;
    private JScrollPane scrollPane;
    private JLabel txtField, txtRowCount;
    private JButton btnAjouter, btnSupprimer, btnClear;
    private JPanel global, centre, boutons, jPTextField;
    private DefaultTableModel dtm;

    private String[] nouvelleLigne = {"", "", ""};
    private String[] enTete = {"prenom", "nom", "force"};
    private String[][] donnee = {
                {"alex", "cool","9000"},
                {"steph", "whiteFox", "9000"},
                {"grumpy", "cat", "420"}};
    private static int aindex;
    public TableTestFinal() {
        super();
        dtm = new DefaultTableModel(donnee, enTete);
        setVisible(true);
        setSize(500, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       maTable = new JTable();
       scrollPane = new JScrollPane(maTable);
       scrollPane.setPreferredSize(new Dimension(350, 250));

        global = new JPanel();
        centre = new JPanel();
        boutons = new JPanel();
        jPTextField = new JPanel();

        btnAjouter = new JButton();
        btnSupprimer = new JButton();
        btnClear = new JButton();

        txtField = new JLabel();
        txtRowCount = new JLabel();

        centre.setLayout(new GridLayout(2,1));
        boutons.setLayout(new GridLayout(3,1));
        global.setLayout(new BorderLayout());
        jPTextField.setLayout(new GridLayout(2, 1));

        boutons.add(btnAjouter);
        boutons.add(btnSupprimer);
        boutons.add(btnClear);
        btnAjouter.setText("Ajouter");
        btnSupprimer.setText("Supprimer");
        btnClear.setText("Enlever la Selection");

        centre.add(scrollPane);

        jPTextField.add(txtRowCount);
        jPTextField.add(txtField);
        txtField.setText("Selection : ");
        txtRowCount.setText(Integer.toString(dtm.getRowCount()) + " " + Integer.toString(aindex));

        global.add(centre);
        global.add(boutons, BorderLayout.EAST);
        global.add(jPTextField, BorderLayout.SOUTH);


        getContentPane().add(global);

        setAction();
        setButtons();
        maTable.setModel(dtm);


    }
    public void setAction(){
        maTable.getSelectionModel().addListSelectionListener((ListSelectionListener) this);

    }
    @Override
    public void valueChanged(ListSelectionEvent e) {
        String selectedData = "";
        aindex = maTable.getSelectedRow();

        int[] colonne = maTable.getSelectedColumns();
        for(int i = 0; i < 3; i++){
            selectedData += (String) maTable.getValueAt(aindex, i);
        }
        txtField.setText("Selection : 777 -> " + selectedData + "  " + aindex);
        txtRowCount.setText(Integer.toString(dtm.getRowCount()) + "   " + Integer.toString(aindex));
        //maTable.getSelectionModel().clearSelection();
    }
    public void setButtons(){
        btnAjouter.addActionListener(new java.awt.event.ActionListener() {

                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    dtm.addRow(nouvelleLigne);
                }
            });
        btnSupprimer.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent evt) {
                DefaultCellEditor dce = (DefaultCellEditor)maTable.getCellEditor();
                if (dce != null) dce.stopCellEditing();
//                int viewIndex = maTable.getSelectedRow();
//                if(viewIndex != -1) {
//                    int modelIndex = maTable.convertRowIndexToModel(viewIndex);
//                    DefaultTableModel model = (DefaultTableModel)maTable.getModel();
//                    model.removeRow(modelIndex);
//                    modelIndex = maTable.getSelectedRow();
//                }
//                dtm.moveRow(aindex, aindex, 0);
                dtm.removeRow(aindex);
                dtm.fireTableRowsDeleted(aindex, aindex);

                //effaceColone(maTable);
            }
        });
    }
    public void effaceColone( JTable table){
        DefaultCellEditor dce = (DefaultCellEditor)maTable.getCellEditor();
        if (dce != null) dce.stopCellEditing();
        DefaultTableModel model = (DefaultTableModel) table.getModel();
        int[] rows = table.getSelectedRows();
        for(int i=0;i<rows.length;i++){
            dtm.removeRow(rows[i]-i);
            dtm.fireTableRowsDeleted(rows[i]-i, rows[i]-i);
        }
    }



    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TableTestFinal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TableTestFinal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TableTestFinal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TableTestFinal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TableTestFinal().setVisible(true);
            }
        });
    }



    // Variables declaration - do not modify
    // End of variables declaration
}