import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Notifies all registered listeners that the annotation has changed.
 *
 * @param event  contains information about the event that triggered the
 *               notification.
 *
 * @see #addChangeListener(AnnotationChangeListener)
 * @see #removeChangeListener(AnnotationChangeListener)
 */
protected void notifyListeners(AnnotationChangeEvent event) {

    Object[] listeners = this.listenerList.getListenerList();
    for (int i = listeners.length - 2; i >= 0; i -= 2) {
        if (listeners[i] == AnnotationChangeListener.class) {
            ((AnnotationChangeListener) listeners[i + 1]).annotationChanged(
                    event);
        }
    }

}
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Registers an object for notification of changes to the annotation.
 *
 * @param listener  the object to register.
 */
public void addChangeListener(AnnotationChangeListener listener);
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Deregisters an object for notification of changes to the annotation.
 *
 * @param listener  the object to deregister.
 */
public void removeChangeListener(AnnotationChangeListener listener);
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Registers an object to receive notification of changes to the
 * annotation.
 *
 * @param listener  the object to register.
 *
 * @see #removeChangeListener(AnnotationChangeListener)
 */
@Override
public void addChangeListener(AnnotationChangeListener listener) {
    this.listenerList.add(AnnotationChangeListener.class, listener);
}
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Deregisters an object so that it no longer receives notification of
 * changes to the annotation.
 *
 * @param listener  the object to deregister.
 *
 * @see #addChangeListener(AnnotationChangeListener)
 */
@Override
public void removeChangeListener(AnnotationChangeListener listener) {
    this.listenerList.remove(AnnotationChangeListener.class, listener);
}
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Registers an object to receive notification of changes to the
 * annotation.
 *
 * @param listener  the object to register.
 *
 * @see #removeChangeListener(AnnotationChangeListener)
 */
public void addChangeListener(AnnotationChangeListener listener) {
    this.listenerList.add(AnnotationChangeListener.class, listener);
}
 

import org.jfree.chart.event.AnnotationChangeListener; //导入依赖的package包/类
/**
 * Deregisters an object so that it no longer receives notification of
 * changes to the annotation.
 *
 * @param listener  the object to deregister.
 *
 * @see #addChangeListener(AnnotationChangeListener)
 */
public void removeChangeListener(AnnotationChangeListener listener) {
    this.listenerList.remove(AnnotationChangeListener.class, listener);
}