subject.java

GEF初学者可以用来对照的小例子

package com.dss.moon.gef.model;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

public class Subject {

	protected PropertyChangeSupport listeners = 
		new PropertyChangeSupport(this);
	
	public void addPropertyChangeListener(PropertyChangeListener listener){
		listeners.addPropertyChangeListener(listener);
	}
	
	public void firePropertyChange(String prop,Object old, Object newValue){
		listeners.firePropertyChange(prop,old,newValue);
	}
	
	public void removePropertyChangeListener(PropertyChangeListener i ){
		listeners.removePropertyChangeListener(i);
	}
	

}