diff --git a/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Auditable.java b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Auditable.java
new file mode 100644
index 000000000000..fa6ffee28ce5
--- /dev/null
+++ b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Auditable.java
@@ -0,0 +1,5 @@
+package com.baeldung.namingconventions;
+
+@interface Auditable {
+    String action();
+}
diff --git a/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/CustomerAccount.java b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/CustomerAccount.java
new file mode 100644
index 000000000000..aa40298a7056
--- /dev/null
+++ b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/CustomerAccount.java
@@ -0,0 +1,17 @@
+package com.baeldung.namingconventions;
+
+class CustomerAccount {
+    private String accountNumber;
+    private double balance;
+
+    public static final double MAX_BALANCE = 1000000.00;
+
+    public void deposit(double amount) {
+        if (balance + amount > MAX_BALANCE) {
+            System.out.println("Deposit exceeds max balance limit.");
+        } else {
+            this.balance += amount;
+        }
+    }
+}
+
diff --git a/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/DayOfWeek.java b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/DayOfWeek.java
new file mode 100644
index 000000000000..98c3d7013da8
--- /dev/null
+++ b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/DayOfWeek.java
@@ -0,0 +1,11 @@
+package com.baeldung.namingconventions;
+
+enum DayOfWeek {
+    SUNDAY,
+    MONDAY,
+    TUESDAY,
+    WEDNESDAY,
+    THURSDAY,
+    FRIDAY,
+    SATURDAY
+}
diff --git a/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Printable.java b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Printable.java
new file mode 100644
index 000000000000..fa19ae005807
--- /dev/null
+++ b/core-java-modules/core-java-lang-8/src/main/java/com/baeldung/namingconventions/Printable.java
@@ -0,0 +1,5 @@
+package com.baeldung.namingconventions;
+
+interface Printable {
+    void print();
+}