Java Help! Partition the array list for values less than the pivot.

private static ArrayList partitionLess(ArrayList data, int pivot) {

Partition the array list for values equal to the pivot.

private static ArrayList partitionEqual(ArrayList data, int pivot) {

Partition the array list for values greater than the pivot.

private static ArrayList partitionGreater(ArrayList data, int pivot) {

Does a quick sort and returns a newly sorted array list. 

public static ArrayList quickSort(ArrayList data) {