1 files changed, 17 insertions, 13 deletions
diff --git a/de/unibayreuth/se/observer/Subject.java b/de/unibayreuth/se/observer/Subject.java
index 2f0b5bb..659513e 100644
--- a/de/unibayreuth/se/observer/Subject.java
+++ b/de/unibayreuth/se/observer/Subject.java
@@ -1,21 +1,25 @@
 package de.unibayreuth.se.observer;
 
+import java.util.*;
+
 public abstract class Subject {
-    // TODO
+	private List<Observer> observers;
 
-    public Subject() {
-        // TODO
-    }
+	public Subject() {
+		observers = new ArrayList<Observer>();
+	}
 
-    void attach(Observer observer) {
-        // TODO
-    }
+	void attach(Observer observer) {
+		observers.add(observer);
+	}
 
-    void detach(Observer observer) {
-        // TODO
-    }
+	void detach(Observer observer) {
+		observers.remove(observer);
+	}
 
-    protected void fireUpdate() {
-        // TODO
-    }
+	protected void fireUpdate() {
+		System.out.println("Sending update to observers ...");
+		for(Observer o : observers)
+			o.update(this);
+	}
 }