如何使网格填充所有单元格

Question

我使用for循环来随机填充两个不同按钮的8x8网格。我有一组按钮实例，出于某种原因，它只给了我每个按钮中的一个，而没有用任何东西填充网格的其余部分。有什么建议吗？我只包含了代码的buildPanel块，但我确实有单独的按钮类和Game类。我还完成了代码的其余部分。它还没有完全满足我的需求，需要清理，但如果它可能有助于解决这个问题，我可以发布它。如果不写更多细节，我无法在问题中发布更多的代码，但我认为这是一个非常简单的问题。

private void buildPanel()
{        
// Create labels to display the 
treasuresLeftLabel = new JLabel("Treasures left: ");
treasuresFoundLabel = new JLabel("Treasures found: ");        
triesLeftLabel = new JLabel("Tries left: ");

// Create text fields for each label
treasuresLeftTextField = new JTextField(2);
treasuresLeftTextField.setEditable(false);
treasuresLeftTextField.setText(String.valueOf(20-game.getTreasuresFound()));
treasuresFoundTextField = new JTextField(2);
treasuresFoundTextField.setEditable(false);
treasuresFoundTextField.setText(String.valueOf(game.getTreasuresFound()));
triesLeftTextField = new JTextField(2);
triesLeftTextField.setEditable(false);
triesLeftTextField.setText(String.valueOf(game.getTriesLeft()));

emptyButton = new EmptyButton();
emptyButton.addActionListener(new emptyButtonListener());
treasureButton = new TreasureButton();
treasureButton.addActionListener(new treasureButtonListener());
// new JPanel object referenced by panel
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(new JLabel("Treasure Hunt", JLabel.CENTER), BorderLayout.NORTH);
statsPanel = new JPanel();
statsPanel.setLayout(new GridLayout(3, 2));
statsPanel.add(treasuresLeftLabel);
statsPanel.add(treasuresLeftTextField);
statsPanel.add(treasuresFoundLabel);
statsPanel.add(treasuresFoundTextField);
statsPanel.add(triesLeftLabel);
statsPanel.add(triesLeftTextField);

panel.add(statsPanel, BorderLayout.WEST);

JButton[] buttons = new JButton[62];
for (int index = 0; index < 62; index++)
{
if (index < 20)
{
buttons[index] = treasureButton;
}
else
{
buttons[index] = emptyButton;
}
}
gameGridPanel = new JPanel();
gameGridPanel.setLayout(new GridLayout(8, 8));

// Generate a random number between 0 and 61
int randomNumber = new Random().nextInt(62);  
for (int count = 0; count < 62; count++)
{   
if (buttons[randomNumber] != null)
{
gameGridPanel.add(buttons[randomNumber]);
randomNumber = new Random().nextInt(62);  
}
else
{
randomNumber = new Random().nextInt(62);  
}
}

panel.add(gameGridPanel, BorderLayout.CENTER);
}

Answer 1

它只给我每个按钮中的一个

因为每个按钮只有一个实例：

for (int index = 0; index < 62; index++)
{
if (index < 20)
{
buttons[index] = treasureButton; // single instance
}
else
{
buttons[index] = emptyButton; // single instance
}
}

将实例添加到数组时，需要创建一个新实例。

for (int index = 0; index < 62; index++)
{
if (index < 20)
{
//buttons[index] = treasureButton;
buttons[index] = new TreasureButton();            
}
else
{
//buttons[index] = emptyButton;
buttons[index] = new EmptyButton();
}
}

还有一个更容易的方法来随机化按钮是：

1. 将按钮添加到ArrayList
2. 使用Collections.shuffle(...)方法随机化按钮的顺序
3. 遍历ArrayList并将每个按钮添加到网格中