diff --git a/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/Identifiable.java b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/Identifiable.java
new file mode 100644
index 0000000000..080f63b295
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/Identifiable.java
@@ -0,0 +1,5 @@
+package com.baeldung.interfaces.namingconventions;
+
+public interface Identifiable {
+    void identify();
+}
diff --git a/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RegularUser.java b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RegularUser.java
new file mode 100644
index 0000000000..e75d01e365
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RegularUser.java
@@ -0,0 +1,13 @@
+package com.baeldung.interfaces.namingconventions;
+
+public class RegularUser implements User {
+    @Override
+    public void identify() {
+        // some implementation
+    }
+
+    @Override
+    public void authorize() {
+        // some implementation
+    }
+}
diff --git a/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RootUser.java b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RootUser.java
new file mode 100644
index 0000000000..a02804d0b3
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/RootUser.java
@@ -0,0 +1,13 @@
+package com.baeldung.interfaces.namingconventions;
+
+public class RootUser implements User {
+    @Override
+    public void identify() {
+        // some implementation
+    }
+
+    @Override
+    public void authorize() {
+        // some implementation
+    }
+}
diff --git a/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/User.java b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/User.java
new file mode 100644
index 0000000000..2891126ddd
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-others/src/main/java/com/baeldung/interfaces/namingconventions/User.java
@@ -0,0 +1,5 @@
+package com.baeldung.interfaces.namingconventions;
+
+public interface User extends Identifiable {
+    void authorize();
+}