2 files changed, 11 insertions, 10 deletions
diff --git a/core/src/main/java/coffee/liz/ecs/DAGWorld.java b/core/src/main/java/coffee/liz/ecs/DAGWorld.java
index dea83ef..b5b54c2 100644
--- a/core/src/main/java/coffee/liz/ecs/DAGWorld.java
+++ b/core/src/main/java/coffee/liz/ecs/DAGWorld.java
@@ -154,12 +154,12 @@ public class DAGWorld<T> implements World<T> {
 		return Collections.unmodifiableList(result);
 	}
 
-    @Override
-    public void close() throws Exception {
-        for (final System<T> system : systemExecutionOrder) {
-            system.close();
-        }
-        componentCache.clear();
-        entities.clear();
-    }
+	@Override
+	public void close() throws Exception {
+		for (final System<T> system : systemExecutionOrder) {
+			system.close();
+		}
+		componentCache.clear();
+		entities.clear();
+	}
 }
diff --git a/core/src/main/java/coffee/liz/ecs/model/System.java b/core/src/main/java/coffee/liz/ecs/model/System.java
index cc46f39..ac99818 100644
--- a/core/src/main/java/coffee/liz/ecs/model/System.java
+++ b/core/src/main/java/coffee/liz/ecs/model/System.java
@@ -27,6 +27,7 @@ public interface System<T> extends AutoCloseable {
 	 */
 	void update(final World<T> world, final T state, final Duration dt);
 
-    @Override
-    default void close() {}
+	@Override
+	default void close() {
+	}
 }