Write a Java program to find the sum of elements in an array.

The provided Java program calculates the sum of the elements in an array.

class Main {
    public static void main(String[] args) {
        int[] arr = {6, 6, 7, 8, 8, 9};
        int sum = sumOfArr(arr);
        System.out.println("Sum of elements in the array: " + sum);
    }

    public static int sumOfArr(int[] arr) {
        int sum = 0;
        for (int num : arr) {
            sum += num;
        }
        return sum;
    }
}

Output:

Sum of elements in the array: 44

How It Works

1. Input Array:
   • The input array is {6, 6, 7, 8, 8, 9}.
2. sumOfArr Method:
   • The sumOfArr method loops through each element of the array using an enhanced for loop.
   • It adds each number in the array to the sum variable.
3. Returning the Sum:
   • After looping through all the elements, the total sum is returned to the main method.
4. Output:
   • The sum of the array elements is printed.

Execution:

1. Initialize sum = 0.
2. Loop through the array:
   • Add 6 to sum → sum = 6
   • Add 6 to sum → sum = 12
   • Add 7 to sum → sum = 19
   • Add 8 to sum → sum = 27
   • Add 8 to sum → sum = 35
   • Add 9 to sum → sum = 44
3. Return sum = 44.

Advantages

1. Simple and Efficient:
   • The code uses a basic loop to iterate over the array and calculate the sum, which is efficient for arrays of reasonable size.
2. Readability:
   • The method is clear and easy to understand, making it straightforward for other developers to follow.

Edge Cases

1. Empty Array:
   • Input: arr = {}
   • Output: Sum of elements in the array: 0
2. Array with Negative Numbers:
   • Input: arr = {-1, 5, -3, 2}
   • Output: Sum of elements in the array: 3
3. All Zeroes:
   • Input: arr = {0, 0, 0, 0}
   • Output: Sum of elements in the array: 0