Java - Counting Sort

public static long countingSort(int[] list) {
    int high = 999;
    int low = 0;
    int[] counts = new int[high - low + 1];

    for(int i = 0; i < counts.length; i++) {
        counts[i] = 0;
    }

    int x = 0;
    for(int i = low; i <= high; i++) {
        list[x] = i;
        x += 1;
        counts[i - low] = counts[i - low] - 1;
    }

    return list;
}