diff --git a/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableFinal.java b/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableFinal.java
new file mode 100644
index 0000000000..5d5f5d7ab6
--- /dev/null
+++ b/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableFinal.java
@@ -0,0 +1,23 @@
+package com.baeldung.finalkeyword;
+
+public class ClassVariableFinal {
+
+    final static String X = "x";
+    final static String Y = "y";
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 1500; i++) {
+            long startTime = System.nanoTime();
+            String result = concatStrings();
+            long totalTime = System.nanoTime() - startTime;
+            if (i >= 500) {
+                System.out.println(totalTime);
+            }
+        }
+    }
+
+    private static String concatStrings() {
+        return X + Y;
+    }
+
+}
diff --git a/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableNonFinal.java b/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableNonFinal.java
new file mode 100644
index 0000000000..8219b1688f
--- /dev/null
+++ b/core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/ClassVariableNonFinal.java
@@ -0,0 +1,23 @@
+package com.baeldung.finalkeyword;
+
+public class ClassVariableNonFinal {
+
+    static String x = "x";
+    static String y = "y";
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 1500; i++) {
+            long startTime = System.nanoTime();
+            String result = concatStrings();
+            long totalTime = System.nanoTime() - startTime;
+            if (i >= 500) {
+                System.out.println(totalTime);
+            }
+        }
+    }
+
+    private static String concatStrings() {
+        return x + y;
+    }
+
+}