diff --git a/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java
index 2c3da7b1fc..e11f8e8ba0 100644
--- a/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java
+++ b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java
@@ -6,11 +6,11 @@ public class ArrayListOfArrayList {
 
     public static void main(String args[]) {
 
-        int numVertices = 3;
-        ArrayList<ArrayList<Integer>> graph = new ArrayList<>(numVertices);
+        int vertexCount = 3;
+        ArrayList<ArrayList<Integer>> graph = new ArrayList<>(vertexCount);
 
         //Initializing each element of ArrayList with ArrayList
-        for(int i=0; i< numVertices; i++) {
+        for(int i = 0; i< vertexCount; i++) {
             graph.add(new ArrayList<Integer>());
         }
 
@@ -21,13 +21,14 @@ public class ArrayListOfArrayList {
         graph.get(1).add(0);
         graph.get(2).add(1);
         graph.get(0).add(2);
-      
-        //Printing all the edges
-        for(int vertexNo=0; vertexNo<numVertices; vertexNo++) {
-            int edgeCount = graph.get(vertexNo).size();
-            ArrayList<Integer> listOfVertices = graph.get(vertexNo);
-            for(int i=0; i<edgeCount; i++) {
-                System.out.println("Vertex "+vertexNo+" is connected to vetex "+listOfVertices.get(i));
+
+        vertexCount = graph.size();
+        for(int i = 0; i < vertexCount; i++) {
+            int edgeCount = graph.get(i).size();
+            for(int j = 0; j < edgeCount; j++) {
+                Integer startVertex = i;
+                Integer endVertex = graph.get(i).get(j);
+                System.out.printf("Vertex %d is connected to vertex %d%n", startVertex, endVertex);
             }
         }
     }
diff --git a/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ThreeDimensionalArrayList.java b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ThreeDimensionalArrayList.java
index 24a3115e10..2021afb0ee 100644
--- a/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ThreeDimensionalArrayList.java
+++ b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ThreeDimensionalArrayList.java
@@ -12,9 +12,9 @@ public class ThreeDimensionalArrayList {
         ArrayList< ArrayList< ArrayList<String> > > space = new ArrayList<>(x_axis_length);
 
         //Initializing each element of ArrayList with ArrayList< ArrayList<String> >
-        for(int i=0; i< x_axis_length; i++) {
+        for(int i = 0; i < x_axis_length; i++) {
             space.add(new ArrayList< ArrayList<String> >(y_axis_length));
-            for(int j =0; j< y_axis_length; j++) {
+            for(int j = 0; j < y_axis_length; j++) {
                 space.get(i).add(new ArrayList<String>(z_axis_length));
             }
         }
@@ -33,9 +33,9 @@ public class ThreeDimensionalArrayList {
         space.get(1).get(1).add(1,"Yellow");
 
         //Printing colors for all the points
-        for(int i=0; i<x_axis_length; i++) {
-            for(int j=0; j<y_axis_length; j++) {
-                for(int k=0; k<z_axis_length; k++) {
+        for(int i = 0; i < x_axis_length; i++) {
+            for(int j = 0; j < y_axis_length; j++) {
+                for(int k = 0; k < z_axis_length; k++) {
                     System.out.println("Color of point ("+i+","+j+","+k+") is :"+space.get(i).get(j).get(k));
                 }
             }