package com.cheng.bigtalkdesignpatterns.observer;
import java.util.ArrayList;
import java.util.List;
/**
* 具体的主题角色
*/
public class ConcreteWatched implements Watched {
private List<Watcher> list = new ArrayList<>();
@Override
public void addWatcher(Watcher watcher) {
list.add(watcher);
}
@Override
public void removeWatcher(Watcher watcher) {
list.remove(watcher);
}
@Override
public void notifyWatchers(String str) {
for (Watcher watcher : list) {
watcher.update(str);
}
}
}