如何使用单选按钮选择Java图形

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

public class ShapeSelectionApp extends JFrame {
    private JRadioButton circleButton;
    private JRadioButton rectangleButton;
    private JRadioButton triangleButton;

    public ShapeSelectionApp() {
        setTitle("Shape Selection App");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        // 创建单选按钮组
        ButtonGroup shapeGroup = new ButtonGroup();

        // 创建单选按钮
        circleButton = new JRadioButton("Circle");
        rectangleButton = new JRadioButton("Rectangle");
        triangleButton = new JRadioButton("Triangle");

        // 将单选按钮添加到单选按钮组
        shapeGroup.add(circleButton);
        shapeGroup.add(rectangleButton);
        shapeGroup.add(triangleButton);

        // 添加单选按钮到窗口
        add(circleButton);
        add(rectangleButton);
        add(triangleButton);

        // 添加事件监听器
        circleButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 执行绘制圆形的操作
                // TODO: 在这里编写绘制圆形的代码
            }
        });

        rectangleButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 执行绘制矩形的操作
                // TODO: 在这里编写绘制矩形的代码
            }
        });

        triangleButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 执行绘制三角形的操作
                // TODO: 在这里编写绘制三角形的代码
            }
        });

        pack();
        setVisible(true);
    }

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