PaintComponent()

Question

i had canvas(My Board) class which worked fine when i run it as an application.
but i change canvas to JPanel
and now when i run a game
when i start new game it does not display board for a second and then it will disappear.
or when i try to override (repaint() method) it draw the board but it disappaer after i resize a window,
Public class ChessGame {
JFrame a = new JFrame
Chess a =new Chess()
a.init()
a.start();
Class Chess extends JApplet
Board board;
public init()
board = new board (this);
Class Board extends JPanel
public void newgame()
int [] setup= [............]
for (int i=0; i < 120; i++)
board = setup [i];
repaint();
//for (int i=21; i < 99; i++)
//     { if (board[i]!=7)
//     paintField(i);     
i try to draw my board like that but it with dispaear if i resize my window
public void paintComponent(Graphics g) {
g.setColor(Color.red);
g.drawString("Loading...............",144,134);
for ( int i = 21; i < 99; i++)
if (board[i]!=7)
paintField(i);
super.paintComponent(g);     
public void paintField (int index)
//load graphic
Graphics g = getGraphics ();
//calculate x and y
int x = (index - 21) % 10;
int y = (index - 21) / 10;
//paint ground field
if ( (x+y) % 2 == 0)
g.setColor( white);
else
g.setColor( darkgreen );
g.fillRect ( x * 50, y * 50, 50, 50);
//paint piece
if (!bool)
{try {
  g.drawImage (pieces[((boardcolor [index]-1)*10)+(board[index]%10)], x * 50, y * 50, 50, 50, drawer);
catch (ArrayIndexOutOfBoundsException e) {}     
else
try {     g.drawImage (secpiece [((boardcolor [index] -1)*10)+board[index]%10], x * 50, y * 50, 50, 50, drawer);
catch (ArrayIndexOutOfBoundsException e) {}

Answer 1

Kinda confusing:
Public class ChessGame {
  JFrame a = new JFrame
  Chess a =new Chess()
  a.init()
  a.start();No () for the new JFrame? There is a JFrame named a and a Chess named a?
  Board board;
  public init()
    board = new board (this);
  Class Board extends JPanel
    public void newgame()
      int [] setup= [............]
      for (int i=0; i < 120; i++)
        board = setup[i] ;
      } So is the board = setup<i> a different board tham board = new board? 'cause one is a Board and the other an int??
public void paintComponent(Graphics g) {
  g.setColor(Color.red);
  g.drawString("Loading...............",144,134);
  for ( int i = 21; i < 99; i++)
    if (board!=7)
      paintField(i);
    super.paintComponent(g); Firt, super.paintComponent should be first in the paintComponent class, not last. Second, you only want to paintField when board is not 7?
You should also see if you can pass the same graphic component to paintField that you use for this drawing, like:
paintField(i, g);
instead of getting a new graphics.