【Java开源代码栏目提醒】:网学会员鉴于大家对Java开源代码十分关注,论文会员在此为大家搜集整理了“ConcreteSubject.java”一文,供大家参考学习
package com.javapatterns.observer.concept;
import java.util.Vector;
import java.util.Enumeration;
public class ConcreteSubject implements Subject
{
/**
* @associates <{Observer}>
* @link aggregation
* @supplierCardinality 0..*
*/
private Vector observersVector = new java.util.Vector();
public void attach(Observer observer)
{
observersVector.addElement(observer);
}
public void detach(Observer observer)
{
observersVector.removeElement(observer);
}
public void notifyObservers()
{
Enumeration enumeration = observers();
while (enumeration.hasMoreElements())
{
((Observer)enumeration.nextElement()).update();
}
}
public Enumeration observers()
{
return ((Vector) observersVector.clone()).elements();
}
}
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