java - 根据 JRadioButton 选择更改 JButton 的图标

Question

我有一个带有 ActionListener 的 JRadioButton，但无法弄清楚如何在单击时触发不同面板中 JButton 的图标更改。下面列出了两者的代码。当选择正确的单选按钮时，图像需要从左侧按钮切换到右侧。

package gui;

public class ExampleGUI extends JFrame {

private static final long serialVersionUID = 1L;
private JPanel contentPane;
ImageIcon icon = new ImageIcon(ExampleGUI.class
        .getResource("/gui/schlange1.gif"));

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                ExampleGUI frame = new ExampleGUI();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public ExampleGUI() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 5));
    setContentPane(contentPane);

    JLabel lblExampleGui = new JLabel("Example GUI");
    lblExampleGui.setFont(new Font("Tahoma", Font.PLAIN, 18));
    lblExampleGui.setHorizontalAlignment(SwingConstants.CENTER);
    contentPane.add(lblExampleGui, BorderLayout.NORTH);

    JPanel radioButtonPanel = new JPanel();
    contentPane.add(radioButtonPanel, BorderLayout.SOUTH);

    JPanel imagePanelBoxes = mainImagePanel();
    contentPane.add(imagePanelBoxes, BorderLayout.CENTER);

    JButton leftImage = leftClickImage();
    imagePanelBoxes.add(leftImage);

    JButton rightImage = rightClickImage();
    imagePanelBoxes.add(rightImage);

    JRadioButton leftRadioButton = leftRadioButton();
    radioButtonPanel.add(leftRadioButton);

    JRadioButton rightRadioButton = rightRadioButton();
    radioButtonPanel.add(rightRadioButton);

    ButtonGroup group = new ButtonGroup();
    group.add(leftRadioButton);
    group.add(rightRadioButton);
}

private JPanel mainImagePanel() {
    JPanel imagesPanel = new JPanel();
    imagesPanel.setBorder(new EmptyBorder(0, 5, 0, 5));
    imagesPanel.setLayout(new GridLayout(0, 2, 10, 0));
    return imagesPanel;
}

private JRadioButton leftRadioButton() {
    final JRadioButton leftRadioButton = new JRadioButton("LEFT");
    leftRadioButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeIcon(leftClickImage(), icon);
        }
    });
    leftRadioButton.setSelected(true);
    return leftRadioButton;
}

private JRadioButton rightRadioButton() {
    final JRadioButton rightRadioButton = new JRadioButton("RIGHT");
    rightRadioButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            changeIcon(rightClickImage(), icon);
        }
    });
    rightRadioButton.isSelected();
    return rightRadioButton;
}

private JButton leftClickImage() {
    JButton leftImage = new JButton("");
    leftImage.setIcon(new ImageIcon(ExampleGUI.class
            .getResource("/gui/schlange1.gif")));
    leftImage.setBackground(Color.BLACK);
    return leftImage;
}

private JButton rightClickImage() {
    final JButton rightImage = new JButton("");
    rightImage.setBackground(Color.BLACK);
    return rightImage;
}

public void changeIcon(JButton jb, ImageIcon icon) {
    jb.setIcon(icon);
}

}

Answer 1

public class SwitchButton {
public static void main(String [] args){
    SwitchButton sb = new SwitchButton();
}

JFrame jfButtons =  new JFrame();
JPanel jpButtons =  new JPanel();
JRadioButton jrb = new JRadioButton("if you click me");
JButton jb = new JButton("I'll change");

public SwitchButton(){
    jrb.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            changeColor(jb, Color.blue);
        }
    });
    jpButtons.add(jrb);
    jpButtons.add(jb);
    jfButtons.add(jpButtons);
    jfButtons.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    jfButtons.setVisible(true);
    jfButtons.pack();
}

public void changeColor(JButton jbtn, Color color){
    jbtn.setBackground(color);
}

}

这基本上完成了您想要做的事情。您只需将changeColor()更改为changeIcon()