我將如何使用jswing中的單選按鈕使偵聽器能夠根據所選內容在給定單元格中放置S或O？-有解無憂

package SOS;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class BoardPanel {
    private JFrame frame;

    private void createAndDisplayGui() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createTopPanel(), BorderLayout.PAGE_START);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private void createBoard(ActionEvent event) {
        Object source = event.getSource();
        if (source instanceof JTextField) {
            JTextField textField = (JTextField) source;
            String text = textField.getText();
            int dimension = Integer.parseInt(text);
            JPanel board = new JPanel(new GridLayout(dimension, dimension));
            for (int row = 0; row < dimension; row  ) {
                for (int col = 0; col < dimension; col  ) {
                    JLabel square = new JLabel("   ");
                    square.setBackground(Color.white);
                    square.setOpaque(true);
                    square.setBorder(BorderFactory.createLineBorder(Color.black));
                    board.add(square);
                }
            }
            frame.add(board, BorderLayout.CENTER);
            frame.pack();
        }
    }

    private JPanel createTopPanel() {
        
         JRadioButton optionS = new JRadioButton("S");
         JRadioButton optionO = new JRadioButton("O");
         
         ButtonGroup group = new ButtonGroup();
         group.add(optionS);
         group.add(optionO);
        
        JPanel topPanel = new JPanel();
        JLabel label = new JLabel("Board size:");
        topPanel.add(label);
        JTextField boardSize = new JTextField(6);
        boardSize.addActionListener(this::createBoard);
        topPanel.add(boardSize);
        topPanel.add(optionS, BorderLayout.NORTH);
        topPanel.add(optionO, BorderLayout.CENTER);
        return topPanel;
        
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new BoardPanel().createAndDisplayGui());
    }
}

我知道我應該為每個單選按鈕制作一個動作監聽器，這看起來很簡單，但我對如何做到這一點感到困惑，然后將其轉換為在給定單元格的游戲板上放置一個 S 或 O，具體取決于什么選擇。我認為更令人困惑的部分是能夠根據選擇的內容在給定的單元格中繪制 S 或 O。這是一個 SOS 游戲，有點像井字游戲。我嘗試遵循一個簡單的井字游戲示例，但由于沒有像這樣的單選按鈕而迷路了，而且我正在使用不同的 createboard 方法。

uj5u.com熱心網友回復：

您可以全域宣告您的單選按鈕，以便檢查所選狀態。然后在您的單元格中的偵聽器中檢查并放置適當的字母：

package SOS;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class BoardPanel {

    private JFrame frame;
    private JRadioButton optionS;
    private JRadioButton optionO;

    private void createAndDisplayGui() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(createTopPanel(), BorderLayout.PAGE_START);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private void createBoard(ActionEvent event) {
        Object source = event.getSource();
        if (source instanceof JTextField) {
            JTextField textField = (JTextField) source;
            String text = textField.getText();
            int dimension = Integer.parseInt(text);
            JPanel board = new JPanel(new GridLayout(dimension, dimension));
            for (int row = 0; row < dimension; row  ) {
                for (int col = 0; col < dimension; col  ) {
                    JLabel square = new JLabel("   ");
                    square.setBackground(Color.white);
                    square.setOpaque(true);
                    square.setBorder(BorderFactory.createLineBorder(Color.black));
                    board.add(square);
                    square.addMouseListener(new MouseAdapter() {
                        @Override
                        public void mouseClicked(MouseEvent e) {
                            square.setText(optionS.isSelected() ? " S " : " O ");
                        }
                    });
                }
            }
            frame.getContentPane().add(board, BorderLayout.CENTER);
            frame.pack();
        }
    }

    private JPanel createTopPanel() {

        optionS = new JRadioButton("S");
        optionO = new JRadioButton("O");

        ButtonGroup group = new ButtonGroup();
        group.add(optionS);
        group.add(optionO);

        JPanel topPanel = new JPanel();
        JLabel label = new JLabel("Board size:");
        topPanel.add(label);
        JTextField boardSize = new JTextField(6);
        boardSize.addActionListener(this::createBoard);
        topPanel.add(boardSize);
        topPanel.add(optionS, BorderLayout.NORTH);
        topPanel.add(optionO, BorderLayout.CENTER);
        return topPanel;

    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new BoardPanel().createAndDisplayGui());
    }
}

uj5u.com熱心網友回復：

有幾種方法可以做到這一點，就個人而言，我喜歡解耦作業流并盡可能地洗掉依賴項。

例如，您的createBoard方法是假設用戶如何獲取dimension值。如果您想將該作業流程更改為使用JSpinneror會發生JCombobox什么？然后，您還必須修改此方法。

最好將完成作業所需的資訊傳遞給該方法。事實上，我會讓它回傳一個 , 的實體JPanel，以便洗掉所有依賴項，畢竟createBoard應該這樣做，僅此而已。

我改變了作業流程，所以現在有一個專用的“創建”按鈕，這將收集它需要的資訊，以便能夠創建板本身。不像其他方法那樣動態，但它讓用戶有時間考慮他們的輸入

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class BoardPanel {

    private JFrame frame;

    enum State {
        S, O;
    }

    private JPanel board;

    private void createAndDisplayGui() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createTopPanel(), BorderLayout.PAGE_START);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createBoard(int dimension, State state) {
        JPanel board = new JPanel(new GridLayout(dimension, dimension));
        for (int row = 0; row < dimension; row  ) {
            for (int col = 0; col < dimension; col  ) {
                JLabel square = new JLabel("  "   state.name()   "  ");
                square.setBackground(Color.white);
                square.setOpaque(true);
                square.setBorder(BorderFactory.createLineBorder(Color.black));
                board.add(square);
            }
        }
        return board;
    }

    private JPanel createTopPanel() {
        JRadioButton optionS = new JRadioButton("S");
        JRadioButton optionO = new JRadioButton("O");
        JTextField boardSize = new JTextField(6);
        JPanel topPanel = new JPanel();

        ButtonGroup group = new ButtonGroup();
        group.add(optionS);
        group.add(optionO);

        // Default state
        optionS.setSelected(true);

        JButton createButton = new JButton("Make it so");
        createButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                State state = State.O;
                if (optionS.isSelected()) {
                    state = State.S;
                }
                try {
                    int dimension = Integer.parseInt(boardSize.getText());
                    if (board != null) {
                        frame.remove(board);
                    }
                    board = createBoard(dimension, state);
                    frame.add(board, BorderLayout.CENTER);
                    frame.pack();
                } catch (NumberFormatException exp) {
                    JOptionPane.showMessageDialog(topPanel, "Invalid board size", "Error", JOptionPane.ERROR_MESSAGE);
                }
            }
        });

        JLabel label = new JLabel("Board size:");
        topPanel.add(label);
        topPanel.add(boardSize);
        topPanel.add(optionS);
        topPanel.add(optionO);
        topPanel.add(createButton);

        return topPanel;

    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new BoardPanel().createAndDisplayGui());
    }
}

如果您更喜歡動態的東西，那么您可以將共享添加ActionListener到按鈕和文本欄位中，例如...

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class BoardPanel {

    private JFrame frame;

    enum State {
        S, O;
    }

    private JPanel board;

    private void createAndDisplayGui() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createTopPanel(), BorderLayout.PAGE_START);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createBoard(int dimension, State state) {
        JPanel board = new JPanel(new GridLayout(dimension, dimension));
        for (int row = 0; row < dimension; row  ) {
            for (int col = 0; col < dimension; col  ) {
                JLabel square = new JLabel("  "   state.name()   "  ");
                square.setBackground(Color.white);
                square.setOpaque(true);
                square.setBorder(BorderFactory.createLineBorder(Color.black));
                board.add(square);
            }
        }
        return board;
    }

    private JPanel createTopPanel() {
        JRadioButton optionS = new JRadioButton("S");
        JRadioButton optionO = new JRadioButton("O");
        JTextField boardSize = new JTextField(6);
        JPanel topPanel = new JPanel();

        ButtonGroup group = new ButtonGroup();
        group.add(optionS);
        group.add(optionO);
        
        ActionListener actionListener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                State state = State.O;
                if (optionS.isSelected()) {
                    state = State.S;
                }
                try {
                    int dimension = Integer.parseInt(boardSize.getText());
                    if (board != null) {
                        frame.remove(board);
                    }
                    board = createBoard(dimension, state);
                    frame.add(board, BorderLayout.CENTER);
                    frame.pack();
                } catch (NumberFormatException exp) {
                    // Not yet ready
                }
            }
        };
        
        optionS.addActionListener(actionListener);
        optionO.addActionListener(actionListener);
        boardSize.addActionListener(actionListener);

        // Default state
        optionS.setSelected(true);

        JLabel label = new JLabel("Board size:");
        topPanel.add(label);
        topPanel.add(boardSize);
        topPanel.add(optionS);
        topPanel.add(optionO);

        return topPanel;

    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new BoardPanel().createAndDisplayGui());
    }
}

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