如何在java中创建不需要额外方法的自定义组件？

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

public class MyComponent extends JPanel {
    
    private Color backgroundColor;
    private String text;

    public MyComponent() {
        super();
        backgroundColor = Color.WHITE;
        text = "Hello World";
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(backgroundColor);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(Color.BLACK);
        g.drawString(text, getWidth() / 2, getHeight() / 2);
    }

    public void setBackgroundColor(Color color) {
        backgroundColor = color;
        repaint();
    }

    public void setText(String text) {
        this.text = text;
        repaint();
    }

    public Color getBackgroundColor() {
        return backgroundColor;
    }

    public String getText() {
        return text;
    }
}