How to use

addAnnotation

method

in

org.jfree.chart.renderer.xy.AbstractXYItemRenderer

/**
 * Adds an annotation and sends a {@link RendererChangeEvent} to all
 * registered listeners.  The annotation is added to the foreground
 * layer.
 *
 * @param annotation  the annotation ({@code null} not permitted).
 */
@Override
public void addAnnotation(XYAnnotation annotation) {
  // defer argument checking
  addAnnotation(annotation, Layer.FOREGROUND);
}

/**
 * Adds an annotation and sends a {@link RendererChangeEvent} to all
 * registered listeners.  The annotation is added to the foreground
 * layer.
 *
 * @param annotation  the annotation (<code>null</code> not permitted).
 */
public void addAnnotation(XYAnnotation annotation) {
  // defer argument checking
  addAnnotation(annotation, Layer.FOREGROUND);
}