CustomWidget implementation in Java

CustomWidget.java

public class CustomWidget extends JComponent {
  private List<RenderingCommand> rendering;
  
  public void draw(List<RenderingCommand> rendering) {
    this.rendering = rendering;
    repaint();
  }
  
  public void paintComponent(Graphics g) {
    for (RenderingCommand command : rendering) {
      command.apply(g);
    }
  }
}