用于创建对象的MousePressed和mouseReleased

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

public class MouseExample extends JFrame {
    private Rectangle rect;
    private Point startPoint;

    public MouseExample() {
        setTitle("Mouse Event Example");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(null);

        rect = new Rectangle(50, 50, 100, 100);
        startPoint = new Point();

        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                if (rect.contains(e.getPoint())) {
                    startPoint.setLocation(e.getPoint());
                }
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                if (startPoint != null) {
                    rect.setLocation(rect.x + e.getX() - startPoint.x, rect.y + e.getY() - startPoint.y);
                    startPoint = null;
                    repaint();
                }
            }
        });

        addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                if (startPoint != null) {
                    rect.setLocation(rect.x + e.getX() - startPoint.x, rect.y + e.getY() - startPoint.y);
                    repaint();
                }
            }
        });
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.BLUE);
        g.fillRect(rect.x, rect.y, rect.width, rect.height);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            MouseExample frame = new MouseExample();
            frame.setVisible(true);
        });
    }
}