diff --git a/checkstyle.xml b/checkstyle.xml
index 5bbc5d72229a..912a6b2488e0 100644
--- a/checkstyle.xml
+++ b/checkstyle.xml
@@ -174,7 +174,7 @@
     <!-- Checks for class design                         -->
     <!-- See https://checkstyle.org/checks/design/index.html -->
     <!-- TODO <module name="DesignForExtension"/> -->
-    <!-- TODO <module name="FinalClass"/> -->
+    <module name="FinalClass"/>
     <module name="HideUtilityClassConstructor"/>
     <module name="InterfaceIsType"/>
     <!-- TODO <module name="VisibilityModifier"/> -->
diff --git a/src/main/java/com/thealgorithms/datastructures/bags/Bag.java b/src/main/java/com/thealgorithms/datastructures/bags/Bag.java
index 66da3d34fcbf..ff5c832baeaf 100644
--- a/src/main/java/com/thealgorithms/datastructures/bags/Bag.java
+++ b/src/main/java/com/thealgorithms/datastructures/bags/Bag.java
@@ -13,7 +13,7 @@ public class Bag<Element> implements Iterable<Element> {
     private Node<Element> firstElement; // first element of the bag
     private int size; // size of bag
 
-    private static class Node<Element> {
+    private static final class Node<Element> {
 
         private Element content;
         private Node<Element> nextElement;
diff --git a/src/main/java/com/thealgorithms/datastructures/dynamicarray/DynamicArray.java b/src/main/java/com/thealgorithms/datastructures/dynamicarray/DynamicArray.java
index e1697f44cacb..186f301f622d 100644
--- a/src/main/java/com/thealgorithms/datastructures/dynamicarray/DynamicArray.java
+++ b/src/main/java/com/thealgorithms/datastructures/dynamicarray/DynamicArray.java
@@ -153,7 +153,7 @@ public Iterator<E> iterator() {
         return new DynamicArrayIterator();
     }
 
-    private class DynamicArrayIterator implements Iterator<E> {
+    private final class DynamicArrayIterator implements Iterator<E> {
 
         private int cursor;
 
diff --git a/src/main/java/com/thealgorithms/datastructures/graphs/WelshPowell.java b/src/main/java/com/thealgorithms/datastructures/graphs/WelshPowell.java
index 3b823f02388d..0981638d4903 100644
--- a/src/main/java/com/thealgorithms/datastructures/graphs/WelshPowell.java
+++ b/src/main/java/com/thealgorithms/datastructures/graphs/WelshPowell.java
@@ -17,7 +17,7 @@ public final class WelshPowell {
     private WelshPowell() {
     }
 
-    static class Graph {
+    static final class Graph {
         private HashSet<Integer>[] adjacencyLists;
 
         private Graph(int vertices) {
diff --git a/src/main/java/com/thealgorithms/datastructures/hashmap/hashing/Intersection.java b/src/main/java/com/thealgorithms/datastructures/hashmap/hashing/Intersection.java
index ad3f617cef5a..54bd10de50fa 100644
--- a/src/main/java/com/thealgorithms/datastructures/hashmap/hashing/Intersection.java
+++ b/src/main/java/com/thealgorithms/datastructures/hashmap/hashing/Intersection.java
@@ -12,7 +12,7 @@
 import java.util.List;
 import java.util.Map;
 
-public class Intersection {
+public final class Intersection {
 
     public static List<Integer> intersection(int[] arr1, int[] arr2) {
         if (arr1 == null || arr2 == null || arr1.length == 0 || arr2.length == 0) {
diff --git a/src/main/java/com/thealgorithms/datastructures/heaps/LeftistHeap.java b/src/main/java/com/thealgorithms/datastructures/heaps/LeftistHeap.java
index cfec2b3c54bd..0e4bcc2c8b80 100644
--- a/src/main/java/com/thealgorithms/datastructures/heaps/LeftistHeap.java
+++ b/src/main/java/com/thealgorithms/datastructures/heaps/LeftistHeap.java
@@ -13,7 +13,7 @@
  */
 
 public class LeftistHeap {
-    private class Node {
+    private final class Node {
         private int element, npl;
         private Node left, right;
 
diff --git a/src/main/java/com/thealgorithms/datastructures/lists/CircleLinkedList.java b/src/main/java/com/thealgorithms/datastructures/lists/CircleLinkedList.java
index c42b10455d14..6eb9d75fe58f 100644
--- a/src/main/java/com/thealgorithms/datastructures/lists/CircleLinkedList.java
+++ b/src/main/java/com/thealgorithms/datastructures/lists/CircleLinkedList.java
@@ -2,7 +2,7 @@
 
 public class CircleLinkedList<E> {
 
-    private static class Node<E> {
+    private static final class Node<E> {
 
         Node<E> next;
         E value;
diff --git a/src/main/java/com/thealgorithms/datastructures/lists/Merge_K_SortedLinkedlist.java b/src/main/java/com/thealgorithms/datastructures/lists/Merge_K_SortedLinkedlist.java
index 7206ccecf25e..d98335b1e5b9 100644
--- a/src/main/java/com/thealgorithms/datastructures/lists/Merge_K_SortedLinkedlist.java
+++ b/src/main/java/com/thealgorithms/datastructures/lists/Merge_K_SortedLinkedlist.java
@@ -43,7 +43,7 @@ Node mergeKList(Node[] a, int N) {
         return head;
     }
 
-    private class Node {
+    private final class Node {
 
         private int data;
         private Node next;
diff --git a/src/main/java/com/thealgorithms/datastructures/trees/GenericTree.java b/src/main/java/com/thealgorithms/datastructures/trees/GenericTree.java
index d348467815c7..39af10bac813 100644
--- a/src/main/java/com/thealgorithms/datastructures/trees/GenericTree.java
+++ b/src/main/java/com/thealgorithms/datastructures/trees/GenericTree.java
@@ -16,7 +16,7 @@
  */
 public class GenericTree {
 
-    private static class Node {
+    private static final class Node {
 
         int data;
         ArrayList<Node> child = new ArrayList<>();
diff --git a/src/main/java/com/thealgorithms/datastructures/trees/TreeRandomNode.java b/src/main/java/com/thealgorithms/datastructures/trees/TreeRandomNode.java
index eeb253d9d342..b1123a224223 100644
--- a/src/main/java/com/thealgorithms/datastructures/trees/TreeRandomNode.java
+++ b/src/main/java/com/thealgorithms/datastructures/trees/TreeRandomNode.java
@@ -26,7 +26,7 @@ the inOrder() method to store the values in the arraylist, then find the size of
 
 public class TreeRandomNode {
 
-    private class Node {
+    private final class Node {
 
         int item;
         Node left, right;
diff --git a/src/main/java/com/thealgorithms/geometry/GrahamScan.java b/src/main/java/com/thealgorithms/geometry/GrahamScan.java
index 9122c6f6f3cc..4f4aebaed971 100644
--- a/src/main/java/com/thealgorithms/geometry/GrahamScan.java
+++ b/src/main/java/com/thealgorithms/geometry/GrahamScan.java
@@ -126,7 +126,7 @@ public Comparator<Point> polarOrder() {
             return new PolarOrder();
         }
 
-        private class PolarOrder implements Comparator<Point> {
+        private final class PolarOrder implements Comparator<Point> {
             public int compare(Point p1, Point p2) {
                 int dx1 = p1.x - x;
                 int dy1 = p1.y - y;
diff --git a/src/main/java/com/thealgorithms/others/RotateMatrixBy90Degrees.java b/src/main/java/com/thealgorithms/others/RotateMatrixBy90Degrees.java
index 081b0d16dce8..985b8b2631a9 100644
--- a/src/main/java/com/thealgorithms/others/RotateMatrixBy90Degrees.java
+++ b/src/main/java/com/thealgorithms/others/RotateMatrixBy90Degrees.java
@@ -6,7 +6,7 @@
  */
 import java.util.Scanner;
 
-class Rotate_by_90_degrees {
+final class Rotate_by_90_degrees {
     private Rotate_by_90_degrees() {
     }