diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java
new file mode 100644
index 000000000..d3f4bf029
--- /dev/null
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java
@@ -0,0 +1,23 @@
+package ru.yandex.practicum.contacts.presentation.base;
+
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class BaseListDiffCallback<T extends ListDiffInterface<T>> extends DiffUtil.ItemCallback<T> {
+    @Override
+    public boolean areItemsTheSame(@NonNull T oldItem, @NonNull T newItem) {
+        return oldItem.theSameAs(newItem);
+    }
+
+    @Override
+    public boolean areContentsTheSame(@NonNull T oldItem, @NonNull T newItem) {
+        return oldItem.equals(newItem);
+    }
+
+    @Nullable
+    @Override
+    public Object getChangePayload(@NonNull T oldItem, @NonNull T newItem) {
+        return newItem;
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java
new file mode 100644
index 000000000..9b4eaffc5
--- /dev/null
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java
@@ -0,0 +1,6 @@
+package ru.yandex.practicum.contacts.presentation.base;
+
+public interface ListDiffInterface<T> {
+    boolean theSameAs(T object);
+    boolean equals(Object object);
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
index 4203bc297..6a95827ca 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
@@ -5,11 +5,11 @@
 import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
+
 import androidx.recyclerview.widget.AdapterListUpdateCallback;
 import androidx.recyclerview.widget.AsyncDifferConfig;
 import androidx.recyclerview.widget.AsyncListDiffer;
-import androidx.recyclerview.widget.DiffUtil;
+
 import androidx.recyclerview.widget.RecyclerView;
 
 import java.util.List;
@@ -21,12 +21,12 @@
 import ru.yandex.practicum.contacts.presentation.filter.model.FilterContactTypeUi;
 import ru.yandex.practicum.contacts.utils.model.ContactTypeUtils;
 import ru.yandex.practicum.contacts.utils.model.FilterContactTypeUtils;
-
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 public class FilterContactTypeAdapter extends RecyclerView.Adapter<FilterContactTypeAdapter.ViewHolder> {
 
     private final AsyncListDiffer<FilterContactTypeUi> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new BaseListDiffCallback<FilterContactTypeUi>()).build()
     );
 
     private final Consumer<FilterContactTypeUi> clickListener;
@@ -86,22 +86,5 @@ public void bind(FilterContactTypeUi data) {
         }
     }
 
-    static class ListDiffCallback extends DiffUtil.ItemCallback<FilterContactTypeUi> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return oldItem.getContactType() == newItem.getContactType();
-        }
 
-        @Override
-        public boolean areContentsTheSame(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return oldItem.equals(newItem);
-        }
-
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
index fbb187fdf..6eafe9bc1 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
@@ -2,7 +2,10 @@
 
 import androidx.annotation.NonNull;
 
-public class FilterContactTypeUi {
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
+
+public class FilterContactTypeUi implements ListDiffInterface<FilterContactTypeUi> {
+
 
     private final FilterContactType contactType;
     private final boolean selected;
@@ -37,4 +40,8 @@ public int hashCode() {
         result = 31 * result + (selected ? 1 : 0);
         return result;
     }
+    @Override
+    public boolean theSameAs(FilterContactTypeUi object){
+        return this.getContactType() == object.getContactType();
+    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
index 9c2317248..64d12f5db 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
@@ -13,7 +13,7 @@
 import androidx.recyclerview.widget.AdapterListUpdateCallback;
 import androidx.recyclerview.widget.AsyncDifferConfig;
 import androidx.recyclerview.widget.AsyncListDiffer;
-import androidx.recyclerview.widget.DiffUtil;
+
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.bumptech.glide.Glide;
@@ -23,12 +23,12 @@
 
 import ru.yandex.practicum.contacts.R;
 import ru.yandex.practicum.contacts.databinding.ItemContactBinding;
-
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ViewHolder> {
 
     private final AsyncListDiffer<ContactUi> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new BaseListDiffCallback<ContactUi>()).build()
     );
 
     @NonNull
@@ -93,22 +93,5 @@ private void loadAvatar(ContactUi contact) {
         }
     }
 
-    static class ListDiffCallback extends DiffUtil.ItemCallback<ContactUi> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return oldItem.hashCode() == newItem.hashCode();
-        }
-
-        @Override
-        public boolean areContentsTheSame(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return oldItem.equals(newItem);
-        }
 
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
index 4b2f216e8..76067a26c 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
@@ -6,7 +6,9 @@
 
 import ru.yandex.practicum.contacts.model.ContactType;
 
-public class ContactUi {
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
+
+public class ContactUi implements ListDiffInterface<ContactUi> {
 
     private final String name;
     private final String phone;
@@ -62,4 +64,8 @@ public int hashCode() {
         result = 31 * result + types.hashCode();
         return result;
     }
+    @Override
+    public boolean theSameAs(ContactUi object){
+        return this.hashCode() == object.hashCode();
+    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
index fde5f59c8..e0413d000 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
@@ -18,12 +18,12 @@
 import ru.yandex.practicum.contacts.R;
 import ru.yandex.practicum.contacts.databinding.ItemSortBinding;
 import ru.yandex.practicum.contacts.presentation.sort.model.SortType;
-
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 public class SortTypeAdapter extends RecyclerView.Adapter<SortTypeAdapter.ViewHolder> {
 
     private final AsyncListDiffer<SortTypeUI> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new  BaseListDiffCallback<SortTypeUI>()).build()
     );
 
     private final Consumer<SortTypeUI> clickListener;
@@ -89,22 +89,5 @@ private int resource(SortType sortType) {
         }
     }
 
-    static class ListDiffCallback extends DiffUtil.ItemCallback<SortTypeUI> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return oldItem.getSortType() == newItem.getSortType();
-        }
 
-        @Override
-        public boolean areContentsTheSame(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return oldItem.equals(newItem);
-        }
-
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
index eb71f27cd..694922e36 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
@@ -4,7 +4,9 @@
 
 import ru.yandex.practicum.contacts.presentation.sort.model.SortType;
 
-public class SortTypeUI {
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
+
+public class SortTypeUI implements ListDiffInterface<SortTypeUI> {
 
     private final SortType sortType;
     private final boolean selected;
@@ -39,4 +41,8 @@ public int hashCode() {
         result = 31 * result + (selected ? 1 : 0);
         return result;
     }
+    @Override
+    public boolean theSameAs(SortTypeUI object){
+        return this.getSortType() == object.getSortType();
+    }
 }