implement spiralTraversal method

src/main/java/MainExercises.java

@@ -1,3 +1,5 @@
+import java.util.ArrayList;
+
 public class MainExercises
 {
     /*
@@ -69,8 +71,50 @@ public class MainExercises
            - Number of columns: matrix[0].length (if rectangular)
    */
     public int[] spiralTraversal(int[][] matrix) {
-        // todo
-        return null;
+
+        int rows = matrix.length;
+        int columns = matrix[0].length;
+
+        int[] result = new int[rows*columns];
+        int count = 0;
+
+        int top = 0;
+        int bottom = rows - 1;
+        int right = columns - 1;
+        int left = 0;
+
+        while (top <= bottom && left <= right) {
+
+            for(int j = left ; j<=right ; j++) {
+                result[count] = matrix[top][j];
+                count++;
+            }
+            top++;
+
+            for(int i = top ; i<=bottom ; i++) {
+                result[count] = matrix[i][right];
+                count++;
+            }
+            right--;
+
+            if(top <= bottom) {
+                for (int j = right; j >= left; j--) {
+                    result[count] = matrix[bottom][j];
+                    count++;
+                }
+            }
+            bottom--;
+
+            if(left <= right){
+                for (int i = bottom; i >= top; i--) {
+                    result[count] = matrix[i][left];
+                    count++;
+                }
+            }
+            left++;
+
+        }
+        return result;
     }
 
     /*