用java写一个简单的随机生成井字棋棋子的程序

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.util.Random;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

public class TicTacToe {

public static void main(String[] args) {

String[] imgs = { "imgs//x.png", "imgs//o.png", "" };
Random rnd = new Random();

JFrame mywin = new JFrame("窗口");
mywin.setSize(400, 440);
mywin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mywin.setLocationRelativeTo(null);

JPanel pan = new JPanel();

/*
for (int i = 1; i <= 9; i++) {
String img = imgs[rnd.nextInt(3)];
JButton btn = new JButton("");
btn.setBackground(new Color(255,255,255));
btn.setIcon(new ImageIcon(img));
pan.add(btn);
}
*/
//用按鈕做出的棋子和棋盘更好看点，代码如上

for (int i = 1; i <= 9; i++) {
String img = imgs[rnd.nextInt(3)];
JLabel pan1 = new JLabel();

pan1.setIcon(new ImageIcon(img));
pan.add(pan1);
}

pan.setLayout(new GridLayout(3, 3));
mywin.add(pan);

mywin.setVisible(true);
}

}