diff --git a/q2/main.py b/q2/main.py
new file mode 100644
index 0000000..508c58f
--- /dev/null
+++ b/q2/main.py
@@ -0,0 +1,70 @@
+import json
+
+class UserManager:
+    def __init__(self):
+        self.users = []
+        self.next_id = 1
+
+    def add_user(self, name: str, age: int) -> dict:
+        user = {
+            "id": self.next_id,
+            "name": name,
+            "age": age
+        }
+        self.users.append(user)
+        self.next_id += 1
+        return user
+
+    def get_user(self, user_id: int):
+        for u in self.users:
+            if u["id"] == user_id:
+                return u
+        return None
+
+    def update_age(self, user_id: int, new_age: int) -> bool:
+        user = self.get_user(user_id)
+        if user is None:
+            return False
+        user["age"] = new_age
+        return True
+
+    def remove_user(self, user_id: int) -> bool:
+        for idx, u in enumerate(self.users):
+            if u["id"] == user_id:
+                self.users.pop(idx)
+                return True
+        return False
+
+    def list_users(self) -> list:
+        return self.users.copy()
+
+    def save_to_json(self, file_path: str):
+        with open(file_path, "w", encoding="utf-8") as f:
+            json.dump(self.users, f, ensure_ascii=False, indent=2)
+
+    def load_from_json(self, file_path: str):
+        with open(file_path, "r", encoding="utf-8") as f:
+            loaded_users = json.load(f)
+        self.users = loaded_users
+        if self.users:
+            max_id = max(u["id"] for u in self.users)
+            self.next_id = max_id + 1
+        else:
+            self.next_id = 1
+
+
+if __name__ == "__main__":
+    um = UserManager()
+    print(um.add_user("张三", 18))
+    print(um.add_user("李四", 20))
+    print(um.get_user(1))
+    print(um.get_user(99))
+    print(um.update_age(1, 19))
+    print(um.remove_user(2))
+    print(um.remove_user(2))
+    print(um.list_users())
+    um.save_to_json("users.json")
+
+    um2 = UserManager()
+    um2.load_from_json("users.json")
+    print(um2.list_users())
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