Why sould the line be under my button?

Question

Hi.... I'm new to java...and I'm trying to implement a TicTacToe game.
I have the following problem...I've created a JFrame and I distributed on it 9 buttons.
I'm trying to draw the winning line on to the three winning buttons after they have been disabled...
I'm testing the first case of wining that is on the first row of this "strange" matrix...but nothing to do. When I draw the line...a piece of it is under the final button :(
I post here bellow my code. If anyone could help me out I would be greatful.
Thanks in advance
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TrisFrame1 extends JFrame implements ActionListener
          JButton a = new JButton();
          JButton b = new JButton();
          JButton c = new JButton();
          JButton d = new JButton();
          JButton e = new JButton();
          JButton f = new JButton();
          JButton g = new JButton();
          JButton h = new JButton();
          JButton i = new JButton();
          static int player=1;
          String sign;
          static switchPlayer Sign = new switchPlayer();
          static TurnofPlayer Player = new TurnofPlayer();
          static winingrules r;
     public TrisFrame1 ()
          super("TrisFrame1");
          setSize(400, 400);
          ExitWindow exit = new ExitWindow();
          JPanel surface = new JPanel();
          GridLayout square = new GridLayout(3,3,20,20);
          surface.setLayout(square);
          getContentPane().add(surface);
          surface.setBackground(Color.blue);
          surface.add(a);
          surface.add(b);
          surface.add(c);
          surface.add(d);
          surface.add(e);
          surface.add(f);
          surface.add(g);
          surface.add(h);
          surface.add(i);
          a.addActionListener(this);
          b.addActionListener(this);
          c.addActionListener(this);
          d.addActionListener(this);
          e.addActionListener(this);
          f.addActionListener(this);
          g.addActionListener(this);
          h.addActionListener(this);
          i.addActionListener(this);
          setContentPane(surface);
          addWindowListener(exit);
          public static void main (String[] arguments)
          TrisFrame1 frame = new TrisFrame1();
          frame.show();
          frame.setVisible(true);
          public void actionPerformed (ActionEvent evt)
               Object clicked = evt.getSource();
               JButton genericbutton = new JButton();
               if (clicked == a)genericbutton=a;
               else if (clicked == b)genericbutton=b;
               else if (clicked == c)genericbutton=c;
               else if (clicked == d)genericbutton=d;
               else if (clicked == e)genericbutton=e;
               else if (clicked == f)genericbutton=f;
               else if (clicked == g)genericbutton=g;
               else if (clicked == h)genericbutton=h;
               else if (clicked == i)genericbutton=i;
               sign=Sign.PlayerSign(player);
               player=Player.turn(player);
               genericbutton.setText(sign);
               genericbutton.setEnabled(false);
               genericbutton.setBackground(Color.gray);
               genericbutton.setFont(new Font ("arial", Font.BOLD,40));
               wins();
     public void wins()
     if (((!a.isEnabled())&&(!b.isEnabled())&&(!c.isEnabled())) && ((a.getText()==b.getText())&&(a.getText()==c.getText())))
          System.out.println ("here I'am");
Designline();
               if (((!d.isEnabled())&&(!d.isEnabled())&&(!f.isEnabled())) && ((d.getText()==e.getText())&&(d.getText()==f.getText())))
          System.out.println ("eccomi qui");
               //Designline();
          // TBC with the controls for the wining cases
     public void Designline()
                    Graphics2D line = (Graphics2D) getGraphics();
                    line.drawLine(50,50,380,100);
          line.dispose();
class ExitWindow extends WindowAdapter {
     public void windowClosing(WindowEvent e)
          System.exit(0);
class TurnofPlayer
     int Player1;
     public TurnofPlayer()
     public int turn(int player1)
          if (player1==1)
               Player1=2;
          else Player1=1;
          return Player1;
class switchPlayer
     String playingsign;
     public switchPlayer()
     public String PlayerSign(int player1)
          if (player1==1)
               playingsign="X";
          else playingsign="O";
          return playingsign;

Answer 1

maybe you should disable the button as soon as the person clicks it.. I think its just a matter of the timing between when you clicked on the button, and it still having focus when you draw the line.