Java

Question

我已经看到了一些例子，但还是不明白如何解决这个问题，可能没有一个干净的解决方案.. 我正在尝试通过使用 Jtable 和 10*10 作为单元格来构建 John Conway 的生命游戏。我知道如何更改 table 背景颜色（所有单元格），但我无法更改 特定单元格颜色更改 。我知道，我需要用 CellRenderer 创建一个 class，但我也无法理解它..

这是我的代码：

public class theGame {

    public static void main(String [] args) {

        theMatrix gui = new theMatrix();

        gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gui.setSize(550,450);
        gui.setVisible(true);
        gui.setTitle("Game Of Life");



        JOptionPane.showMessageDialog(null, "  Welcome John Conway's Game Of Life  ");
        int replay = JOptionPane.showConfirmDialog(null, "Would you like to see the next generation?", "Close?", JOptionPane.YES_NO_OPTION);

        if (replay == JOptionPane.YES_OPTION);

    }
}

public class theMatrix extends JFrame { 

    JTable table;

    public theMatrix() {
        setLayout(new FlowLayout());
        String[] columNames = {"", "", "", "", "", "", "", "", "", ""};

        Object[][] data = { // Create a 10*10 table with default values.

            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null}
        }

        table = new JTable(data, columNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 500));
        table.setRowHeight(40);
        table.setBackground(Color.lightGray);

        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);

    }
}

Answer 1

下面是呈现的自定义单元格的示例，它根据行和列更改背景颜色：

public class TheMatrix extends JFrame {

    JTable table;

    public TheMatrix() {
        setLayout(new FlowLayout());
        String[] columNames = {"", "", "", "", "", "", "", "", "", ""};

        Object[][] data = { // Create a 10*10 table with default values.

            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null},
            {null, null, null, null, null, null, null, null, null, null}
        };

        table = new JTable(data, columNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 500));
        table.setRowHeight(40);
        table.setDefaultRenderer(Object.class, new MyRenderer());

        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);
    }
}

class MyRenderer implements TableCellRenderer {

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
                                    boolean hasFocus, int row, int col) {
        JTextField cell = new JTextField();

        cell.setBackground(((row % 2) == 0) && ((col % 2) == 0) ? Color.WHITE : Color.BLACK);
        return cell;
      }
}

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conways-game-of-life