彩票生成器

要求：是彩票生成器，点击按钮，随机生成一行彩票号码，再点击一下，接着显示第二组号码（总10行）

谢啦半天没有解决，点击按钮，10行就一下子全出来了~最后在网友的帮助想解决了，在此感谢！

package com.liqimo.lianxi03;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class RandomFrame extends JFrame implements ActionListener
{
    
    JButton jb;
    
    JPanel jp;
    
    JButton[][] jbn;
    
    public static int n = 0;
    
    public RandomFrame()
    {
        this.setTitle("彩票生成器");
        this.setSize(500, 500);
        this.setLocation(200, 300);
        jp = new JPanel();
        jp.setLayout(new GridLayout(10, 8));
        jb = new JButton("随机生成按钮");
        jb.addActionListener(this);
        jbn = new JButton[10][8];
        for (int i = 0; i < 10; i++)
        {
            for (int j = 0; j < 8; j++)
            {
                jbn[i][j] = new JButton();
                jp.add(jbn[i][j]);
            }
            
        }
        
        this.add(jb, "North");
        this.add(jp, "Center");
        this.setDefaultCloseOperation(3);
        this.setVisible(true);
    }
    
    public static void main(String[] args)
    {
        new RandomFrame();
    }
    
    @Override
    public void actionPerformed(ActionEvent e)
    {
        
        if (e.getSource() == jb)
        {
            for (int i = n; i <= n; i++)
            {
                // int i = 1;
                for (int j = 0; j < 8; j++)
                {
                    if (j == 0)
                    {
                        jbn[i][0].setText(i + "");
                        
                    }
                    else if (j == 7)
                    {
                        jbn[i][j].setBackground(Color.blue);
                        jbn[i][j].setText((int)(Math.random() * 33) + "");
                    }
                    else
                    {
                        jbn[i][j].setBackground(Color.yellow);
                        jbn[i][j].setText((int)(Math.random() * 33) + "");
                    }
                    
                }
                
            }
            if (n < 9)
            {
                n++;
            }
            else
            {
                n = 0;
            }
            
        }
        
    }
    
}

运行效果图：