创建一个面板；在JPanel面板上放置三个JRadioButton按钮，代表“红”、“黄”、“蓝”；将按钮添加到panel面板和ButtonGroup按钮组中并添加监听器，选择三个JRadioButton按钮可以改变面板的颜色。

好的，下面是Java代码实现：

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class ColorPanel extends JFrame implements ActionListener {
    private JPanel panel;
    private JRadioButton redButton, yellowButton, blueButton;
    private ButtonGroup buttonGroup;

    public ColorPanel() {
        setTitle("Color Panel");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 300);

        panel = new JPanel();

        redButton = new JRadioButton("Red");
        yellowButton = new JRadioButton("Yellow");
        blueButton = new JRadioButton("Blue");

        buttonGroup = new ButtonGroup();
        buttonGroup.add(redButton);
        buttonGroup.add(yellowButton);
        buttonGroup.add(blueButton);

        redButton.addActionListener(this);
        yellowButton.addActionListener(this);
        blueButton.addActionListener(this);

        panel.add(redButton);
        panel.add(yellowButton);
        panel.add(blueButton);

        add(panel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (redButton.isSelected()) {
            panel.setBackground(Color.RED);
        } else if (yellowButton.isSelected()) {
            panel.setBackground(Color.YELLOW);
        } else if (blueButton.isSelected()) {
            panel.setBackground(Color.BLUE);
        }
    }

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

运行程序，你将会看到一个有三个单选按钮的面板，当你选择单选按钮时，面板的背景颜色会随之改变。