diff --git a/实验7/src/task1/HelloCollections.java b/实验7/src/task1/HelloCollections.java
index d4ac3ca..692c7ec 100644
--- a/实验7/src/task1/HelloCollections.java
+++ b/实验7/src/task1/HelloCollections.java
@@ -4,6 +4,8 @@ import java.util.ArrayList;
 
 public class HelloCollections {
     public ArrayList run() {
+        ArrayList<String> list = new ArrayList<>();
+        list.add("hello, world");
         return list;
     }
 }
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