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ueb07 b)

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This commit is contained in:
Daniel Langbein 2024-12-07 14:34:33 +01:00
parent fab514a41e
commit a30c457c41
Signed by: langfingaz
GPG Key ID: 6C47C753F0823002
1 changed files with 10 additions and 2 deletions
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12
ueb07_news_example_b/src/model/NewsCollection.java
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@ -1,10 +1,14 @@
package model; package model;
import java.util.*; import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Observer;
import java.util.Set;
public class NewsCollection extends NewsItem { public class NewsCollection extends NewsItem {
private List<NewsItem> newsItems = new LinkedList<NewsItem>(); private List<NewsItem> newsItems = new LinkedList<>();
// We use a set to avoid duplicates. // We use a set to avoid duplicates.
Set<Observer> observers = new HashSet<>(); Set<Observer> observers = new HashSet<>();
@ -45,7 +49,11 @@ public class NewsCollection extends NewsItem {
*/ */
public NewsCollection addItem(NewsItem item) { public NewsCollection addItem(NewsItem item) {
newsItems.add(item); newsItems.add(item);
observers.forEach(item::addObserver); observers.forEach(item::addObserver);
setChanged();
notifyObservers(getTitle() + "\n➕ " + item.getTitle());
return this; return this;
} }