public static <T> void sort(T[] a, Comparator<? super T> c) {
    
    
    if (c == null) {
    
    
        sort(a);
    } else {
    
    
        if (LegacyMergeSort.userRequested)
            legacyMergeSort(a, c);
        else
            TimSort.sort(a, 0, a.length, c, null, 0, 0);
    }
}