Adding MainTestTraversal method.

src/main/java/MainExercises.java

@@ -65,9 +65,37 @@ public class MainExercises
            - Number of columns: matrix[0].length (if rectangular)
    */
     public int[] spiralTraversal(int[][] matrix) {
-        // todo
-        return null;
+        int rows = matrix.length;
+        int cols = matrix[0].length;
+        int[] result = new int[rows * cols];
+        int index = 0;
+        int top = 0, bottom = rows - 1;
+        int left = 0, right = cols - 1;
+        while (top <= bottom && left <= right) {
+            for (int j = left; j <= right; j++) {
+                result[index++] = matrix[top][j];
             }
+            top++;
+            for (int i = top; i <= bottom; i++) {
+                result[index++] = matrix[i][right];
+            }
+            right--;
+            if (top <= bottom) {
+                for (int j = right; j >= left; j--) {
+                    result[index++] = matrix[bottom][j];
+                }
+                bottom--;
+            }
+            if (left <= right) {
+                for (int i = bottom; i >= top; i--) {
+                    result[index++] = matrix[i][left];
+                }
+                left++;
+            }
+        }
+        return result;
+    }
+
 
     /*
         integer partitioning is a combinatorics problem in discreet maths