快速排序项目中使用到的

List<FlowUseCondition> sortActiveFlowList = quickSort(activeDurationList);

//快速排序获取最小的时间
public List<FlowUseCondition> quickSort(List<FlowUseCondition> list){
    if(list==null || list.size()==0) return null;
    if(list.size()<2) return list;
    final long index = list.get(0).getActiveTime().getTime();
    final ArrayList<FlowUseCondition> begin = new ArrayList<FlowUseCondition>();
    final ArrayList<FlowUseCondition> end = new ArrayList<FlowUseCondition>();
    long choice;
    for(int i=1;i<list.size();i++){
        choice = list.get(i).getActiveTime().getTime();
        if(choice<index) begin.add(list.get(i));
        else{
            end.add(list.get(i));
        }
    }

    ArrayList<FlowUseCondition> resultList = (ArrayList<FlowUseCondition>) quickSort(begin);
    if(resultList==null) resultList = new ArrayList<FlowUseCondition>();
    resultList.add(list.get(0));
    if(quickSort(end)!=null){
        resultList.addAll(quickSort(end));
    }
   return resultList;
}