public static void main(String[] args) { String[] memory = {"object15", null, null, "object2", null, null, null, "object32", null, "object4"}; executeDefragmentation(memory); System.out.println(Arrays.toString(memory)); } public static void executeDefragmentation(String[] array) { Arrays.sort(array, Comparator.nullsLast(Comparator.naturalOrder())); } }