java - 按键监听器不断监听更多按键，我不知道如何阻止它这样做

Question

所以我制作了一个小数独游戏，我使用切换按钮来接受输入。基本上，当切换按钮被切换时，会激活一个按键监听器来监听按键 1-9。问题是，输入 key 后，我使用了buttonGroup.clearSelection()，它再次切换按钮，因此它被取消选择，但是文本上方有一个小虚线矩形，如果我按任何其他数字，它会更改前一位数字并写入新数字。我对 Java 和 GUI 很陌生，所以问题可能完全是其他问题。代码附在下面。请帮忙!

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class Test implements ActionListener, KeyListener {
    JFrame frame = new JFrame();
    JPanel panel = new JPanel();
    JToggleButton[] cells = new JToggleButton[81];
    JToggleButton selectedButton = new JToggleButton();
    ButtonGroup group = new ButtonGroup();
    int index;

    int[][] board = {
        {7, 2, 6, 4, 9, 3, 8, 0, 5},
        {3, 1, 5, 0, 2, 8, 0, 4, 6},
        {4, 0, 9, 6, 5, 1, 2, 3, 7},
        {8, 5, 2, 1, 0, 7, 6, 0, 3},
        {6, 7, 3, 9, 0, 5, 0, 2, 4},
        {9, 4, 0, 3, 6, 2, 7, 5, 8},
        {1, 9, 4, 8, 3, 6, 5, 0, 2},
        {5, 0, 7, 2, 1, 0, 3, 8, 9},
        {2, 3, 8, 5, 7, 9, 4, 6, 0}
    };

    public Test() {
        for (int x=0; x<81; x++) {
            cells[x] = new JToggleButton();
            group.add(cells[x]);
            cells[x].putClientProperty("index", x);
            cells[x].addActionListener(this);
            panel.add(cells[x]);
        }

        panel.setLayout(new GridLayout(9, 9, 2, 2)); 
        panel.setBackground(Color.black);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

        printBoard(board);

        frame.setJMenuBar(menuBar);
        frame.pack();
        frame.add(panel); 
        frame.pack();
        frame.setSize(600, 600);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        selectedButton = (JToggleButton)e.getSource();
        index = (int) selectedButton.getClientProperty("index");
        selectedButton.addKeyListener(this);
    }

    public void keyPressed(KeyEvent e) {
        Integer digit;
        Integer r, c;
        r = index / 9;
        c = index % 9;
        digit = Integer.valueOf(e.getKeyCode() - 48);       

        if (digit > 0 && digit <10) {
            board[r][c] = digit;
        }

        String s = digit.toString();

        if (e.getKeyCode() >= 49 && e.getKeyCode() <= 57) {
            selectedButton.setText(s);
            group.clearSelection();
        } else if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE || e.getKeyCode() == KeyEvent.VK_DELETE || e.getKeyCode() == KeyEvent.VK_ESCAPE) {
            board[r][c] = 0;
            selectedButton.setText("");
            group.clearSelection();
        } 
    }

    public void keyReleased(KeyEvent e) {
        group.clearSelection();
    }

    public void keyTyped(KeyEvent e) {}

    public void printBoard(int[][] board) {
        for (int x=0; x<81; x++) { 
            cells[x].setEnabled(true);
        }
        Integer digit;
        String buttonText;

        int buttonIndex = 0;
        for (int r=0; r<9; r++) {
            for (int c=0; c<9; c++) {
                digit = Integer.valueOf(board[r][c]);
                if (digit == 0) {
                    cells[buttonIndex].setText("");
                    buttonIndex++;
                    continue;
                }
                else if (digit != 0) {
                    buttonText = digit.toString();
                    cells[buttonIndex].setText(s);
                    cells[buttonIndex].setEnabled(false);
                    buttonIndex++;
                }
            }
        }
    }

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

这里的group是所有切换按钮的ButtonGroup。它确实取消选择按钮，但关键监听器仍然保持激活状态。请帮忙。

Answer 1

您所要做的就是在释放按键时删除按键监听器。

我必须注释掉 JMenu，因为它一定在其他地方，

这是 GUI。

这是我使用的代码。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SudokuTest implements ActionListener, KeyListener {
    JFrame frame = new JFrame("Sudoku Test");

    JPanel panel = new JPanel();
    JToggleButton[] cells = new JToggleButton[81];
    JToggleButton selectedButton = new JToggleButton();
    ButtonGroup group = new ButtonGroup();
    int index;

    int[][] board = { { 7, 2, 6, 4, 9, 3, 8, 0, 5 }, { 3, 1, 5, 0, 2, 8, 0, 4, 6 }, { 4, 0, 9, 6, 5, 1, 2, 3, 7 },
            { 8, 5, 2, 1, 0, 7, 6, 0, 3 }, { 6, 7, 3, 9, 0, 5, 0, 2, 4 }, { 9, 4, 0, 3, 6, 2, 7, 5, 8 },
            { 1, 9, 4, 8, 3, 6, 5, 0, 2 }, { 5, 0, 7, 2, 1, 0, 3, 8, 9 }, { 2, 3, 8, 5, 7, 9, 4, 6, 0 } };

    public SudokuTest() {
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Font font = panel.getFont().deriveFont(32F).deriveFont(Font.BOLD);
        for (int x = 0; x < 81; x++) {
            cells[x] = new JToggleButton();
            group.add(cells[x]);
            cells[x].putClientProperty("index", x);
            cells[x].addActionListener(this);
            cells[x].setFont(font);
            panel.add(cells[x]);
        }

        panel.setLayout(new GridLayout(9, 9, 2, 2));
        panel.setBackground(Color.black);

        printBoard(board);

//        frame.setJMenuBar(menuBar);
        frame.add(panel);
        frame.pack();
        frame.setSize(600, 600);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        selectedButton = (JToggleButton) e.getSource();
        index = (int) selectedButton.getClientProperty("index");
        selectedButton.addKeyListener(this);
    }

    public void keyPressed(KeyEvent e) {
        Integer digit;
        Integer r, c;
        r = index / 9;
        c = index % 9;
        digit = Integer.valueOf(e.getKeyCode() - 48);

        if (digit > 0 && digit < 10) {
            board[r][c] = digit;
        }

        String s = digit.toString();

        if (e.getKeyCode() >= 49 && e.getKeyCode() <= 57) {
            selectedButton.setText(s);
            group.clearSelection();
        } else if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE || e.getKeyCode() == KeyEvent.VK_DELETE
                || e.getKeyCode() == KeyEvent.VK_ESCAPE) {
            board[r][c] = 0;
            selectedButton.setText("");
            group.clearSelection();
        }
    }

    public void keyReleased(KeyEvent e) {
        group.clearSelection();
        selectedButton.removeKeyListener(this);
    }

    public void keyTyped(KeyEvent e) {
    }

    public void printBoard(int[][] board) {
        for (int x = 0; x < 81; x++) {
            cells[x].setEnabled(true);
        }
        Integer digit;
        String buttonText;

        int buttonIndex = 0;
        for (int r = 0; r < 9; r++) {
            for (int c = 0; c < 9; c++) {
                digit = Integer.valueOf(board[r][c]);
                if (digit == 0) {
                    cells[buttonIndex].setText("");
                    buttonIndex++;
                } else {
                    buttonText = digit.toString();
                    cells[buttonIndex].setText(buttonText);
                    cells[buttonIndex].setEnabled(false);
                    buttonIndex++;
                }
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SudokuTest();
            }
        });
    }

}