小编Zac*_*ing的帖子

我有一个 JPanel，我正在向网格内部添加 25 个 JPanel。我希望每个面板周围都有一个边框，以便您可以清楚地区分每个元素。填充也会起作用。如果我尝试添加边框，我将面板添加到面板的方式会将其应用于包含元素的较大面板。

public class LightsOutView

{ GridLayout ExperimentLayout = new GridLayout(5, 5);

// Creates layout of the GUI
public LightsOutView ()
{
    JFrame frame = new JFrame();
    frame.setTitle("Lights Out");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(500, 500);
    frame.setContentPane(makeContents());
    frame.setVisible(true);
}

/**
 * Creates the blank game board. Returns the panel
 * 
 * @return JPanel
 */
public JPanel makeContents ()
{
    // Create a panel to hold the 5x5 grid
    JPanel board = new JPanel(new GridLayout(5, 5));
    board.setLayout(experimentLayout);

    // Add the components to …