如何讓我的網格填充所有單元格？

我正在使用 for 回圈隨機填充帶有兩個不同按鈕的 8x8 網格。我有一系列按鈕的實體，出于某種原因，它只給我一個按鈕，而不是用任何東西填充網格的其余部分。有什么建議嗎？我只包含了代碼的 buildPanel 塊，但我確實為按鈕和游戲類提供了單獨的類。我也完成了其余的代碼。它并沒有完全滿足我的需要，需要清理，但如果它可能有助于解決這個問題，我可以發布它。我無法在不寫更多細節的情況下在問題中發布比這更多的代碼，但我認為這是一個非常簡單的問題。

    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);
    }

uj5u.com熱心網友回復：

每個按鈕只給我一個

因為每個按鈕只有一個實體：

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

將它添加到陣列時，您需要創建一個新實體。

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();
    }
}

還有一種更簡單的隨機化按鈕的方法是：

1. 將按鈕添加到 ArrayList
2. 使用Collections.shuffle(...)方法隨機化按鈕的順序
3. 遍歷ArrayList每個按鈕并將其添加到網格

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