diff --git a/src/main/java/com/github/hcsp/polymorphism/User.java b/src/main/java/com/github/hcsp/polymorphism/User.java
index 7a601df..6220af6 100644
--- a/src/main/java/com/github/hcsp/polymorphism/User.java
+++ b/src/main/java/com/github/hcsp/polymorphism/User.java
@@ -47,7 +47,10 @@ public int hashCode() {
     /** 老板说让我按照用户名排序 */
     @Override
     public int compareTo(User o) {
-        return name.compareTo(o.name);
+        if(name.compareTo(o.name) == 0) {
+            return id.compareTo(o.id);
+        }
+         return name.compareTo(o.name);
     }
 
     public static void main(String[] args) {
@@ -56,7 +59,7 @@ public static void main(String[] args) {
                         new User(100, "b"),
                         new User(10, "z"),
                         new User(1, "a"),
-                        new User(2000, "a"));
+                        new User(2000, "a2"));
         TreeSet<User> treeSet = new TreeSet<>(users);
         // 为什么这里的输出是3？试着修复其中的bug
         System.out.println(treeSet.size());