diff --git a/notes/Java 并发.md b/notes/Java 并发.md
index a94847d5..cb011950 100644
--- a/notes/Java 并发.md	
+++ b/notes/Java 并发.md	
@@ -613,7 +613,6 @@ public static void main(String[] args) {
     WaitNotifyExample example = new WaitNotifyExample();
     executorService.execute(() -> example.after());
     executorService.execute(() -> example.before());
-    executorService.shutdown();
 }
 ```