Java Graphics2D g2.drawLine正在添加点/坐标，而不是绘制线

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

public class DrawLineExample extends JFrame {
    public DrawLineExample() {
        setTitle("Draw Line Example");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2 = (Graphics2D) g;

        // 绘制线段
        g2.drawLine(50, 50, 200, 200);

        // 添加点
        g2.setColor(Color.RED);
        g2.fillOval(100, 100, 5, 5);
        g2.fillOval(150, 150, 5, 5);
    }

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