sum of all numbers in array java

1int[] a = {10,20,30,40,50};
2int sum = IntStream.of(a).sum();
3System.out.println("The sum is " + sum);
4

1var numbers = [10, 20, 30, 40] 
2var sum = 0;
3for (var i = 0; i < numbers.length; i++) {  sum += numbers[i]}

1const numbers = [10, 20, 30, 40] 
2add = (a, b) =>  a + b
3const sum = numbers.reduce(add)