import java.awt.*;
class TestGridLayout extends Frame{
public static void main(String[] args){
TestGridLayout tgl=new TestGridLayout();
tgl.setTitle("围棋界面");
tgl.setSize(300,300);
GridLayout grid=new GridLayout(9,9);

grid.setHgap(0);
grid.setVgap(0);

tgl.setLayout(grid);

for(int i=0;i<=80;i++){
tgl.add(new Button());
}
tgl.setVisible(true);


}
}我想把围棋棋盘的颜色设为黄色，请问怎么修改程序，谢谢

g.setColor(Color.yellow);
  g是Graphics2D

在用g画棋盘的线