changesupport.java

打印管理程序,测试完全通过.windows开发环境.

/*
    $Author: $
    $Date: $
    $Revision: $
    $NoKeywords: $
*/
package jp.co.ntl.awt.event;

import java.util.Vector;

public class ChangeSupport {
    private Vector listeners = new Vector();
    
    public void addChangeListener(ChangeListener cl) {
        listeners.addElement(cl);
    }
    
    public void removeChangeListener(ChangeListener cl) {
        listeners.removeElement(cl);
    }
    
    public void fireChangeEvent(ChangeEvent ce) {
        Vector v;
        synchronized(this) {
            v = (Vector)listeners.clone();
        }
        for (int i = 0; i < v.size(); i++) {
            ChangeListener cl = (ChangeListener)v.elementAt(i);
            cl.stateChanged(ce);
        }        
    }
}