Question

Is there a difference in terms of efficiency between

int[] numbers = {1,2,3,4,5,6,7,8,9,10};
for (int item : numbers) {
   System.out.println("Count is: " + item);
}

and

int[] numbers = {1,2,3,4,5,6,7,8,9,10};
for (int i = 0; i < 10; i++) {
   System.out.println("Count is: " + numbers[i]);
}

Answer 1

They are the same for arrays. If you have an orders list of numbers you should use

for(int i = min; i <= max; max += stride)

or

for(int i = min; i < max+stride; max += stride)

e.g.

for(int i = 1; i < 11; i++)

or

for(int i = 1; i <= 10; i++)

or if incrementing by 10

for(int j = 0; j <= 100; j += 10)

if you a predefined list of values to use, you can use an array.

I often write them like this

for (int item : new int[] {1, 2, 5, 10, 20, 50, 100}) 
   System.out.println("Count is: " + item);