JFrame上的图像背景

Question

如何让我的图像背景更大，以填满JFrame的空间。

private static void gamePanel() {
    JFrame frame = new JFrame("Mascot Fight Game");
    frame.setContentPane(new JLabel(new ImageIcon(System
            .getProperty("user.dir") + "/image/big10_legends_leaders.gif")));
    Container panel = frame.getContentPane();
    panel.setLayout(null);
    String[] iconString = new String[3];
    int[] boundInt = new int[3];