diff --git a/src/backend/Agent.java b/src/backend/Agent.java
index 8b11e23..17bdf17 100644
--- a/src/backend/Agent.java
+++ b/src/backend/Agent.java
@@ -35,6 +35,10 @@ public abstract class Agent {
 	// if false, agent dies at end of turn
 	// see step function in Simulator
 	public abstract boolean liveTurn(ArrayList<Agent> neighbors, Simulator world);
+
+	public static Agent fromString(String line) {
+		return null;
+	}
 	
 	
 }
diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index 664cca9..ec5660e 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -120,6 +120,9 @@ public class Simulator extends Thread {
 
         return aliveCount;
     }
+    public void stopSimu() {
+    	stopFlag=true;
+    }
 
     public void togglePause() {
         pauseFlag = !pauseFlag;
@@ -267,7 +270,6 @@ public class Simulator extends Thread {
     public void loadAgents(ArrayList<String> stringArray) {
         agents.clear();
         for (String line : stringArray) {
-            // Assuming Agent class has a static method fromString to parse agent information
             Agent agent = Agent.fromString(line);
             if (agent != null) {
                 agents.add(agent);