15.3

import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test_15 extends JFrame{
    public Test_15(){
//        setLayout(new GridLayout(8,8,0,0));
        add(new JP());
    }
    
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Test_15 t = new Test_15();
        t.setTitle("test");
        t.setSize(400,400);
        t.setLocationRelativeTo(null);
        t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        t.setVisible(true);
    }

}

class JP extends JPanel{
    boolean filled = true;
    
    protected void paintComponent(Graphics g){
        super.paintComponent(g);
        double x= 0,y=0;
        int width = getWidth();
        int height = getHeight();
        for(int i = 0; i < 8; i++)
        {
            for (int j =0; j < 8; j++)
            {
        if(filled == false)
        {
        g.drawRect((int)x, (int)y, width/8, height/8);
        filled = true;
        x = x + width/8;
        }
        else
        {
            g.fillRect((int)x, (int)y, width/8, height/8);
            filled = false;
            x = x + width/8;
        }
            }
            y = y + height/8;
            x = 0;
             if (i % 2 == 0)
                 filled = false; 
                  else
                      filled = true;            
        }
    }
}

显示结果为：