diff --git a/src/main/java/com/github/hcsp/polymorphism/NameCollector.java b/src/main/java/com/github/hcsp/polymorphism/NameCollector.java
deleted file mode 100644
index da7f2c6..0000000
--- a/src/main/java/com/github/hcsp/polymorphism/NameCollector.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.github.hcsp.polymorphism;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.function.Consumer;
-
-public class NameCollector implements Consumer<User> {
-    private final List<String> names = new ArrayList<>();
-
-    @Override
-    public void accept(User user) {
-        names.add(user.getName());
-    }
-
-    public List<String> getNames() {
-        return names;
-    }
-}
diff --git a/src/main/java/com/github/hcsp/polymorphism/User.java b/src/main/java/com/github/hcsp/polymorphism/User.java
index 78d927d..e3f7a98 100644
--- a/src/main/java/com/github/hcsp/polymorphism/User.java
+++ b/src/main/java/com/github/hcsp/polymorphism/User.java
@@ -1,13 +1,21 @@
 package com.github.hcsp.polymorphism;
 
+import com.sun.tools.internal.ws.processor.util.ClassNameCollector;
+
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.function.Consumer;
 
-public class User {
-    /** 用户ID，数据库主键，全局唯一 */
+public class User<MimeTypeParameterList> {
+    /**
+     * 用户ID，数据库主键，全局唯一
+     */
     private final Integer id;
 
-    /** 用户名 */
+    /**
+     * 用户名
+     */
     private final String name;
 
     public User(Integer id, String name) {
@@ -26,9 +34,18 @@ public String getName() {
     // 这里使用了一个NameCollector类，请尝试将它改写成匿名内部类
     // 使得代码更加集中，更加容易阅读
     public static List<String> collectNames(List<User> users) {
-        NameCollector collector = new NameCollector();
-        users.forEach(collector);
-        return collector.getNames();
+        List<String> names = new ArrayList<>();
+        users.forEach(new Consumer<User>() {
+            @Override
+            public void accept(User user) {
+                names.add(user.getName());
+            }
+
+            public List<String> getNames() {
+                return names;
+            }
+        });
+        return names;
     }
 
     public static void main(String[] args) {