solves #2535: Difference Between Element Sum and Digit Sum of an Array in java

Author: anishLearnsToCode

README.md

@@ -794,7 +794,7 @@
 | 2520 | [Count the Digits That Divide a Number](https://leetcode.com/problems/count-the-digits-that-divide-a-number)                                                           |                                                                               [![Java](assets/java.png)](src/CountTheDigitsThatDivideANumber.java)                                                                               |                                                                                                                                   |
 | 2525 | [Categorize Box According to Criteria](https://leetcode.com/problems/categorize-box-according-to-criteria)                                                             |                                                                              [![Java](assets/java.png)](src/CategorizeBoxAccordingToCriteria.java)                                                                               |                                                                                                                                   |
 | 2529 | [Maximum Count of Positive Integer and Negative Integer](https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer)                         |                                                                       [![Java](assets/java.png)](src/MaximumCountOfPositiveIntegerAndNegativeInteger.java)                                                                       |                                                                                                                                   |
-| 2535 | [Difference Between Element Sum and Digit Sum of an Array](https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array)                     |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2535 | [Difference Between Element Sum and Digit Sum of an Array](https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array)                     |                                                                       [![Java](assets/java.png)](src/DifferenceBetweenElementSumAndDigitSumOfAnArray.java)                                                                       |                                                                                                                                   |
 | 2540 | [Minimum Common Value](https://leetcode.com/problems/minimum-common-value)                                                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2544 | [Alternating Digit Sum](https://leetcode.com/problems/alternating-digit-sum)                                                                                           |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2549 | [Count Distinct Numbers on Board](https://leetcode.com/problems/count-distinct-numbers-on-board)                                                                       |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/DifferenceBetweenElementSumAndDigitSumOfAnArray.java

@@ -0,0 +1,31 @@
+// https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array
+// T: O(N)
+// S: O(1)
+
+import java.util.Arrays;
+
+public class DifferenceBetweenElementSumAndDigitSumOfAnArray {
+    public int differenceOfSum(int[] nums) {
+        final int elementSum = Arrays.stream(nums).sum();
+        final int digitSum = getDigitSum(nums);
+        return Math.abs(elementSum - digitSum);
+    }
+
+    private int getDigitSum(int[] array) {
+        int sum = 0;
+        for (int number : array) {
+            sum += getDigitSum(number);
+        }
+        return sum;
+    }
+
+    private int getDigitSum(int number) {
+        final String num = number + "";
+        int sum = 0;
+        for (int index = 0 ; index < num.length() ; index++) {
+            int digit = num.charAt(index) - '0';
+            sum += digit;
+        }
+        return sum;
+    }
+}