display user details develope 1

src/main/java/uk/ac/cf/spring/demo/sports/Userdetail/UserService.java

 package uk.ac.cf.spring.demo.sports.Userdetail;
 
 
+import java.util.List;
+
 public interface UserService {
     // 获取所有用户
-    List<User> getAllUsers();
+    static List<User> getAllUsers();
 
     // 通过 ID 获取用户
     User getUserById(Long id);

src/main/java/uk/ac/cf/spring/demo/sports/Userdetail/Userform.java

@@ -9,5 +9,9 @@ public class Userform {
     private Long id;
     private String email;
     private String username;
+
+    public Userform() {
+
+    }
 }