diff --git a/app/src/main/java/lightcontainer/storage/FileReader.java b/app/src/main/java/lightcontainer/storage/FileReader.java
new file mode 100644
index 0000000..4e79a0b
--- /dev/null
+++ b/app/src/main/java/lightcontainer/storage/FileReader.java
@@ -0,0 +1,6 @@
+package lightcontainer.storage;
+
+public interface FileReader {
+
+    AppData readFile(String fileName);
+}
diff --git a/app/src/main/java/lightcontainer/storage/FileWriter.java b/app/src/main/java/lightcontainer/storage/FileWriter.java
new file mode 100644
index 0000000..3cef3aa
--- /dev/null
+++ b/app/src/main/java/lightcontainer/storage/FileWriter.java
@@ -0,0 +1,6 @@
+package lightcontainer.storage;
+
+public interface FileWriter {
+
+    void writeToFile(String fileName, AppData appData);
+}
diff --git a/app/src/main/java/lightcontainer/storage/JsonReader.java b/app/src/main/java/lightcontainer/storage/JsonReader.java
new file mode 100644
index 0000000..0b67603
--- /dev/null
+++ b/app/src/main/java/lightcontainer/storage/JsonReader.java
@@ -0,0 +1,9 @@
+package lightcontainer.storage;
+
+public class JsonReader implements FileReader {
+
+    @Override
+    public AppData readFile(String fileName) {
+        return null;
+    }
+}
diff --git a/app/src/main/java/lightcontainer/storage/JsonRepository.java b/app/src/main/java/lightcontainer/storage/JsonRepository.java
index a002404..c2c693d 100644
--- a/app/src/main/java/lightcontainer/storage/JsonRepository.java
+++ b/app/src/main/java/lightcontainer/storage/JsonRepository.java
@@ -4,12 +4,14 @@ public class JsonRepository implements Repository {
 
 
     @Override
-    public void save(String fileName, AppData data) {
+    public void save(FileWriter fileWriter) {
 
     }
 
     @Override
-    public AppData load(String fileName) {
+    public AppData load(FileReader fileReader) {
         return null;
     }
+
+
 }
diff --git a/app/src/main/java/lightcontainer/storage/JsonWriter.java b/app/src/main/java/lightcontainer/storage/JsonWriter.java
new file mode 100644
index 0000000..56fceb9
--- /dev/null
+++ b/app/src/main/java/lightcontainer/storage/JsonWriter.java
@@ -0,0 +1,9 @@
+package lightcontainer.storage;
+
+public class JsonWriter implements FileWriter {
+
+    @Override
+    public void writeToFile(String fileName, AppData appData) {
+
+    }
+}
diff --git a/app/src/main/java/lightcontainer/storage/Repository.java b/app/src/main/java/lightcontainer/storage/Repository.java
index 79f19fd..b688fc7 100644
--- a/app/src/main/java/lightcontainer/storage/Repository.java
+++ b/app/src/main/java/lightcontainer/storage/Repository.java
@@ -2,7 +2,7 @@ package lightcontainer.storage;
 
 public interface Repository {
 
-    void save(String fileName, AppData data);
+    void save(FileWriter fileWriter);
 
-    AppData load(String fileName);
+    AppData load(FileReader fileReader);
 }