List Sorting

public with sharing class SortSelectOptions {      /*          @Param:List of selectOption to be sort.          @Return: Sorted list of selectOptions by Label      */      public static list<selectOption> selectOptionSortByLabel(list<selectOption>                                                              selectOptionsToSort) {          if(selectOptionsToSort == null || selectOptionsToSort.size() <= 1){              return selectOptionsToSort;          }          List<SelectOption> lessSelectOption = new List<SelectOption>();          List<SelectOption> greaterSelectOption = new List<SelectOption>();          integer pivot = selectOptionsToSort.size() / 2;                    //save the pivot and remove it from the selectOption list          SelectOption pivotValue = selectOptionsToSort[pivot];          selectOptionsToSort.remove(pivot);          for(selectOption SO : selectOptionsToSort){              if(SO.getLabel() <= pivotValue.getLabel()){                  lessSelectOption.add(SO);              }else if(SO.getLabel() > pivotValue.getLabel()){                  greaterSelectOption.add(SO);                 }          }          list<selectOption> sortedSelectOptions = new list<selectOption>();           sortedSelectOptions.addAll(selectOptionSortByLabel(lessSelectOption));          sortedSelectOptions.add(pivotValue);          sortedSelectOptions.addAll(selectOptionSortByLabel(greaterSelectOption));          return SortedSelectOptions;      }      /*          @Param:List of selectOption to be sort.          @Return: Sorted list of selectOptions by Value      */      public static list<selectOption> selectOptionSortByValue(list<selectOption>                                                              selectOptionsToSort){          if(selectOptionsToSort == null || selectOptionsToSort.size() <= 1){              return selectOptionsToSort;          }                 List<SelectOption> lessSelectOption = new List<SelectOption>();          List<SelectOption> greaterSelectOption = new List<SelectOption>();          integer pivot = selectOptionsToSort.size() / 2;                     //save the pivot and remove it from the selectOption list          SelectOption pivotValue = selectOptionsToSort[pivot];           selectOptionsToSort.remove(pivot);          for(selectOption SO : selectOptionsToSort){              if(SO.getValue() <= pivotValue.getValue()){                  lessSelectOption.add(SO);              }else if(SO.getValue() > pivotValue.getValue()){                  greaterSelectOption.add(SO);                 }          }          list<selectOption> SortedSelectOptions = new list<selectOption>();           SortedSelectOptions.addAll(selectOptionSortByValue(lessSelectOption));          SortedSelectOptions.add(pivotValue);          SortedSelectOptions.addAll(selectOptionSortByValue(greaterSelectOption));          return SortedSelectOptions;      }  }