Added missing REST files

src/main/java/REST/Application.java

+package REST;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+        System.out.println("Server running on http://localhost:8080");
+    }
+}
+

src/main/java/REST/ClientExample.java

+package REST;
+
+import org.springframework.http.*;
+import org.springframework.web.client.RestTemplate;
+
+public class ClientExample {
+
+    public static void main(String[] args) {
+        RestTemplate client = new RestTemplate();
+        String serverAddress = "http://localhost:8080";
+
+        // POST EXAMPLE
+        String postPath = "/users/add";
+        User user = new User("John", "Cena");
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<User> request = new HttpEntity<>(user, headers);
+
+        ResponseEntity<Void> postResponse = client.postForEntity(serverAddress + postPath, request, Void.class);
+        System.out.println("POST Response: " + postResponse.getStatusCode());
+
+        // GET REQUEST #1 (get all users)
+        String getPath = "/users";
+        ResponseEntity<User[]> getAllResponse = client.getForEntity(serverAddress + getPath, User[].class);
+        System.out.println("GET All Response: " + getAllResponse.getStatusCode());
+
+        User[] users = getAllResponse.getBody();
+        if (users != null) {
+            System.out.println("Users List:");
+            for (User u : users) {
+                System.out.println("Name: " + u.getName() + ", Surname: " + u.getSurname());
+            }
+        }
+
+        // GET REQUEST #2 (get by name)
+        String getUserPath = "/users/get/john";
+        ResponseEntity<User> userResponse = client.getForEntity(serverAddress + getUserPath, User.class);
+        User u = userResponse.getBody();
+        if (u != null) {
+            System.out.println("Name: " + u.getName() + ", Surname: " + u.getSurname());
+        } else {
+            System.out.println("User not found.");
+        }
+    }
+}

src/main/java/REST/User.java

+package REST;
+
+
+public class User {
+
+    private String name;
+    private String surname;
+
+    //Remember to always add an empty constructor
+    public User() {
+    }
+
+    public User(String name, String surname) {
+        this.name = name;
+        this.surname = surname;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSurname() {
+        return surname;
+    }
+
+    public void setSurname(String surname) {
+        this.surname = surname;
+    }
+}

src/main/java/REST/UserService.java

+package REST;
+
+import org.springframework.stereotype.Service;
+
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service //Spring automatically makes this class a singleton bean
+public class UserService {
+
+    private final List<User> usersList = new ArrayList<>();
+
+    public synchronized List<User> getUsersList() {
+        return new ArrayList<>(usersList);
+    }
+
+    public synchronized void setUsersList(List<User> users) {
+        usersList.clear();
+        usersList.addAll(users);
+    }
+
+    public synchronized void add(User user) {
+        usersList.add(user);
+    }
+
+    public synchronized User getByName(String name) {
+        System.out.println("called");
+        for (User user : usersList) {
+            System.out.println(user.getName());
+            System.out.println(name);
+            if (user.getName() != null && user.getName().equalsIgnoreCase(name)) {
+                return user;
+            }
+        }
+        return null; // Not found
+    }
+}

src/main/java/REST/UsersController.java

+package REST;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/users")
+public class UsersController {
+
+    private final UserService userService;
+
+    @Autowired //tells Spring to automatically resolve and inject the required bean (object) into the class where it's used
+    public UsersController(UserService userService) {
+        this.userService = userService;
+    }
+
+    // Return list of users
+    @GetMapping
+    public ResponseEntity<List<User>> getUsersList() {
+        return ResponseEntity.ok(userService.getUsersList());
+    }
+
+    // Add a new user
+    @PostMapping("/add")
+    public ResponseEntity<Void> addUser(@RequestBody User user) {
+        userService.add(user);
+        return ResponseEntity.ok().build();
+    }
+
+    // Get user by name
+    @GetMapping("/get/{name}")
+    public ResponseEntity<User> getByName(@PathVariable String name) {
+        User user = userService.getByName(name);
+        System.out.println(name);
+        if (user != null)
+            return ResponseEntity.ok(user);
+        else
+            return ResponseEntity.notFound().build();
+    }
+}
+
+
+
+
+