diff --git a/UserDao.java b/UserDao.java
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index 0000000..afeed5b
--- /dev/null
+++ b/UserDao.java
@@ -0,0 +1,24 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Interface.java to edit this template
+ */
+
+package com.example.web;
+
+/**
+ *
+ * @author Archer
+ */
+import java.util.List;
+ 
+public interface UserDao {
+    void insert(User1 user1);
+ 
+    void updateUser(User1 user1);
+ 
+    void deleteUser(User1 user1);
+ 
+    List<User1> selectAll();
+ 
+    List<User1> selectUserById(int userId);
+}
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