?? watcher.java
字號:
package com.javapatterns.observer.watching;
import java.util.Observable;
import java.util.Observer;
public class Watcher implements Observer
{
public Watcher(Watched w)
{
w.addObserver(this);
}
public void update( Observable ob, Object arg)
{
System.out.println("Data has been changed to: '" + ((Watched)ob).retrieveData() + "'");
}
}
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