Question

基本上我正在尝试制作一个Lightout游戏！我想制作一个JButton数组所以我可以跟踪每个按钮的索引（原因是每个按钮的状态取决于其他按钮的状态）

到目前为止，我有：

JPanel panel = new JPanel();
    setTitle("Memory");
    setContentPane(panel);
    setPreferredSize(new Dimension(300, 300));
    panel.setLayout(new GridLayout(5,5));


    JButton[][] buttons = new JButton[5][5] ;
    for (int i = 0; i < 5; i++)
        for (int j = 0; j < 5; j++) {
          buttons[i][j] = new JButton();

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    pack();
    setVisible(true);
        }

但这并不像我期望的那样。当我运行它时，我刚刚得到了一个空白的JFrame。任何帮助将不胜感激

Answer 1

附加的代码应该修复它。您正在创建按钮，但不将其添加到JFrame。我编辑了代码来添加动作监听器，当你点击它时，它会访问JButton的id并显示它。

public class CodeSample extends JFrame {

private static final long serialVersionUID = -8134989438964195251L;

public CodeSample() {
    JPanel panel = new JPanel();
    setTitle("Memory");
    setContentPane(panel);
    setPreferredSize(new Dimension(300, 300));
    panel.setLayout(new GridLayout(5, 5));
    ButtonListener listener = new ButtonListener();

    JButton[][] buttons = new JButton[5][5];
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            buttons[i][j] = new JButton();
            buttons[i][j].setBackground(Color.black);
            buttons[i][j].putClientProperty("id",
                    String.valueOf(i).concat(String.valueOf(j)));
            buttons[i][j].addActionListener(listener);
            panel.add(buttons[i][j]);
        }
    }

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    pack();
    setVisible(true);
}

public static class ButtonListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println(((JButton) e.getSource())
                .getClientProperty("id"));
    }

}

public static void main(String[] args) {
    new CodeSample();
}
}

创建一个JButton数组

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