java for loop vs manual code

Question

Nowadays I do some optimize work in java, and got an interesting(?) question.

My test environment is jdk 1.8 and Windows 10 and with intellij 2018.1. And there is a test-code below.

int count = 1000000;
int listSize = 10;
    {
        // case 1
        List<Integer> list = new ArrayList<>(listSize);
        long start = System.nanoTime();
        for (int i = 0; i < count; i++) {
            for (int j = 0; j < listSize; j++) {
                list.add(j);
            }
        }
        long end = System.nanoTime();

        long result = end - start;
        System.out.println("Result: " + result);
    }

    {
        // case 2
        List<Integer> list = new ArrayList<>(listSize);
        long start = System.nanoTime();
        for (int i = 0; i < count; i++) {
            list.add(0);
            list.add(1);
            list.add(2);
            list.add(3);
            list.add(4);
            list.add(5);
            list.add(6);
            list.add(7);
            list.add(8);
            list.add(9);
        }
        long end = System.nanoTime();

        long result = end - start;
        System.out.println("Result: " + result);
    }

And the result is

Result: 134686088 Result: 183671342

And my question is Why is there the performance difference between the above two codes? With the visual studio on c++, i remember the compiler(visual studio) optimize two case to same machine language.

Anyone could help me? and tell me the best way(best performance) with java loop programming.

Thx.