java - 我有一个 JButton 的 2D 数组，但似乎只有一个 JButton 添加到我的面板中

Question

我试图让我的 JPanel 在 10 x 10 网格中包含 100 个 Jbutton，但是当我运行代码时，只出现 1 个大按钮。我在下面发布了我的代码，所有导入已被删除以节省空间，所有必要的导入都在项目中，但此处未显示。

这是我的“SnowballFight”类(class):

package snowballfight;
public class SnowballFight extends JFrame implements ActionListener{
    private JTextField display = new JTextField("Welcome to the SnowBall fight!");
    /**
     * @param args the command line arguments
     */
    public SnowballFight(){
        setLayout(new BorderLayout(1,2));
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout( 10, 10));
        display.setHorizontalAlignment(JButton.CENTER);
        display.setEditable(false);
        add(display, BorderLayout.NORTH);
        add(panel, BorderLayout.SOUTH);
    }
    public static void main(String[] args) {
        SnowballFight frame = new SnowballFight();
        GameBoard game = new GameBoard(frame);
    }
    public void actionPerformed(ActionEvent event) {
    }
}

和我的“GameBoard”类:

package snowballfight;
public class GameBoard extends JFrame implements ActionListener{
    private JButton[][] game = new JButton[10][10];
    private JTextField display = new JTextField("Welcome to the SnowBall fight!");
    private Opponent[] opponents = new Opponent[4];


    public GameBoard(SnowballFight frame){
        for (int row = 0; row < game.length; row++) {
            for (int col = 0; col < game[row].length; col++) {
                game[row][col] = new JButton();
                game[row][col].setBackground(Color.gray);
                game[row][col].addActionListener(this);
                frame.add(game[row][col]);
            }
        }
        frame.setTitle("Snowball Fight");
        frame.setSize(200, 150);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    public boolean isGameOver(){
        for (int opponent = 0; opponent < opponents.length; opponent++) {
            if(opponents[opponent].isSoaked() == false ){
                return false;
            }
        }
        return true;
    }
    public void actionPerformed(ActionEvent event) {
    }
}

新的 GameBoard 类:

public GameBoard(SnowballFight frame){
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout( 10, 10));
        for (int row = 0; row < game.length; row++) {
            for (int col = 0; col < game[row].length; col++) {
                game[row][col] = new JButton();
                game[row][col].setBackground(Color.gray);
                game[row][col].addActionListener(this);
                panel.add(game[row][col]);
            }
        }
        add(display, BorderLayout.NORTH);
        add(panel, BorderLayout.SOUTH);
        frame.setTitle("Snowball Fight");
        frame.setSize(200, 150);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

Answer 1

frame.add(game[row][col]);

您确实意识到 JFrame 的默认布局是 BorderLayout 对吗？并且只有一个组件可以出现在 BorderLayout 的任何一个区域中？请改用 GridLayout。