Using the Random() class with enhanced for loops

Enhanced for loops are weird. Why does

int size = 10;
    Random random = new Random();
    int[] scores = new int[size];


    for (int score : scores){
    scores[score] = random.nextInt(size);
    } 
System.out.println(Arrays.toString(scores));

Give me a mostly empty array where only the first element is the random number, whilst:

int size = 10;
    Random random = new Random();
    int[] scores = new int[size];


    for (int i = 0; i < scores.length; i++){
        scores[i] = random.nextInt(size);
    }
System.out.println(Arrays.toString(scores));

gives me what I want: a 10-element array composed of random digits? I thought the two loops were substitutions of each other; but when it comes to the Random(), it's only the first element that gets altered?