diff --git a/day-07/api/src/main/java/com/bookstore/api/services/CategoryServiceImp.java b/day-07/api/src/main/java/com/bookstore/api/services/CategoryServiceImp.java
new file mode 100644
index 0000000..f7be6ea
--- /dev/null
+++ b/day-07/api/src/main/java/com/bookstore/api/services/CategoryServiceImp.java
@@ -0,0 +1,58 @@
+package com.example.book_store_api.services.concretes;
+
+import com.example.book_store_api.entities.Category;
+import com.example.book_store_api.entities.models.ApiResponse;
+import com.example.book_store_api.exceptions.notFoundExcepitons.CategoryNotFoundExcepiton;
+import com.example.book_store_api.repositories.CategoryRepository;
+import com.example.book_store_api.services.abs.CategoryService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+@Service
+public class CategoryServiceImp implements CategoryService {
+    private final CategoryRepository categoryRepository;
+
+    @Autowired
+    public CategoryServiceImp(CategoryRepository categoryRepository){
+        this.categoryRepository = categoryRepository;
+    }
+
+    @Override
+    public ApiResponse<List<Category>> getAllCategory() {
+        List<Category> allCategories = categoryRepository.findAll();
+        return ApiResponse.StatusOk(allCategories);
+
+    }
+
+    @Override
+    public ApiResponse<Category> createCategory(Category category) {
+        Category data = categoryRepository.save(category);
+        return ApiResponse.StatusCreated(data);
+    }
+
+    @Override
+    public ApiResponse<Category>  getOneCategory(int id) {
+        Category category = categoryRepository.findById(id).orElseThrow(()-> new CategoryNotFoundExcepiton(id));
+        return ApiResponse.StatusOk(category);
+    }
+
+
+
+    @Override
+    public ApiResponse<Category> updateOneCategory(int id,Category category) {
+        getOneCategory(id);
+        category.setId(id);
+        Category data = categoryRepository.save(category);
+        return ApiResponse.StatusAccepted(data);
+    }
+
+    @Override
+    public ApiResponse<Void> deleteCategory(int id) {
+        getOneCategory(id);
+        categoryRepository.deleteById(id);
+        return ApiResponse.StatusNoContent(null);
+    }
+
+
+}