java sum all element of array code example

Example 1: sum of all numbers in array java

int[] a = {10,20,30,40,50};
int sum = IntStream.of(a).sum();
System.out.println("The sum is " + sum);

Example 2: java running sum of array

class Solution {
    public int[] runningSum(int[] nums) {
        int[] sol = new int[nums.length];
        sol[0] = nums[0];
        for(int i = 1; i < nums.length; i++) {
            sol[i] = sol[i-1] + nums[i];
        }
        return sol;
    }
}

// Example: runningSum([1,3,6,9]) = [1, 4, 10, 19] = [1, 1+3, 1+3+6, 1+3+6+9]