Update UserService.java

UserService/UserService/src/main/java/com/lcwd/user/service/controllers/UserController.java

@@ -65,4 +65,12 @@ public ResponseEntity<List<User>> getAllUser() {
         List<User> allUser = userService.getAllUser();
         return ResponseEntity.ok(allUser);
     }
+
+    // update the user
+      @PutMapping("/{userId}")
+    public ResponseEntity<String> updateUser(@PathVariable String userId, @RequestBody User user) throws ResourceNotFoundException {
+        User updatedUser = userService.updateUser(userId, user);
+        String message = "User with ID " + userId + " has been successfully updated.";
+        return ResponseEntity.ok(message);
+    }
 }

UserService/UserService/src/main/java/com/lcwd/user/service/services/UserService.java

@@ -20,6 +20,7 @@ public interface UserService {
 
     //TODO: delete
     //TODO: update
-
+     // this method help us to update user in server
+    User updateUser(String userId,User user) throws ResourceNotFoundException;
 
 }

UserService/UserService/src/main/java/com/lcwd/user/service/services/impl/UserServiceImpl.java

@@ -75,4 +75,32 @@ public User getUser(String userId) {
 
         return user;
     }
+
+    // update the user
+    // step we use optional to avoid null pointer exception 
+    // first we need user present with given user id in server then we get user .
+    // then update the user
+     @Override
+    public User updateUser(String userId, User user) throws ResourceNotFoundException {
+        Optional<User> optionalUser = userRepository.findById(userId);
+        if(optionalUser.isPresent()) {
+            User user1 = optionalUser.get();
+            if (user.getName() != null) {
+                user1.setName(user.getName());
+            }
+            if (user.getEmail() != null) {
+                user1.setEmail(user.getEmail());
+            }
+            if (user.getAbout() != null) {
+                user1.setAbout(user.getAbout());
+            }
+
+            return userRepository.save(user);
+        }
+        else{
+            throw new ResourceNotFoundException ("User not found with ID: " + userId);
+        }
+    }
+
+
 }