如何使用MouseListener移动不同的形状

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

public class ShapeMoveExample extends JFrame {
    private ShapePanel shapePanel;

    public ShapeMoveExample() {
        shapePanel = new ShapePanel();
        add(shapePanel);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 400);
        setVisible(true);
    }

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

class ShapePanel extends JPanel implements MouseListener {
    private Shape selectedShape;
    private int offsetX, offsetY;

    public ShapePanel() {
        setPreferredSize(new Dimension(400, 400));
        setBackground(Color.WHITE);
        addMouseListener(this);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        // 绘制形状
        if (selectedShape != null) {
            g.setColor(selectedShape.getColor());
            g.fillShape(selectedShape);
        }
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        // 实现其他操作，例如改变形状的颜色、大小等
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // 获取鼠标点击的坐标，并判断是否在形状内部
        int x = e.getX();
        int y = e.getY();

        if (selectedShape != null && selectedShape.contains(x, y)) {
            offsetX = x - selectedShape.getX();
            offsetY = y - selectedShape.getY();
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // 获取鼠标释放的坐标，并计算鼠标移动的距离
        int x = e.getX();
        int y = e.getY();

        if (selectedShape != null) {
            int dx = x - selectedShape.getX() - offsetX;
            int dy = y - selectedShape.getY() - offsetY;

            // 将距离应用到形状的位置上，实现形状的移动
            selectedShape.move(dx, dy);
            repaint();
        }
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // 实现鼠标进入形状时的操作，例如改变形状的透明度、边框等
    }

    @Override
    public void mouseExited(MouseEvent e) {
        // 实现鼠标离开形状时的操作，例如改变形状的透明度、边框等
    }
}

class Shape {
    private int x, y;
    private Color color;

    public Shape(int x, int y, Color color) {
        this.x = x;
        this.y = y;
        this.color = color;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public Color getColor() {
        return color;
    }

    public boolean contains(int x, int y) {
        // 判断坐标是否在形状内部
        // 实现具体的判断逻辑
        return false;
    }

    public void move(int dx, int dy) {
        // 将距离应用到形状的位置上，实现形状的移动
        // 实现具体的移动逻辑
    }

    public void fillShape(Graphics g) {
        // 绘制形状
        // 实现具体的绘制逻辑
    }
}