List排序怎么用Collections.sort和Comparator

小編給大家分享一下List排序怎么用Collections.sort和Comparator，希望大家閱讀完這篇文章之后都有所收獲，下面讓我們一起去探討吧！

/**
 * example of list sort
 * @param schedules
 * @param schoolId
 * @return boolean
 */
public boolean checkCourseTimes(List schedules, Long schoolId){
 boolean flag=false;
 Collections.sort(schedules, new Comparator() {
  public int compare(Object a, Object b) {
   Schedule cs1 = (Schedule) a;
   Schedule cs2 = (Schedule) b;
   Date cs1date=cs1.getStartTime();
   Date cs2date=cs2.getStartTime();
   int temp=cs1date.compareTo(cs2date);
   return temp;
  }
 });
 return flag;
}

另一個

/**
 * 遞歸對tree進行sort
 *
 * @param channelCsTypes
 */
private void sort(List channelCsTypes, Comparator compara) {
 if (channelCsTypes == null || channelCsTypes.size() < 1)
  return;
 for (int i = 0; i < channelCsTypes.size(); i++) {
  List subs = ((ChannelCstype) channelCsTypes.get(i)).getSubTypes();
  sort(subs, compara);
 }
 Collections.sort(channelCsTypes, compara);
}

public List loadAllCstypesByChannel(String channel) {
 List result = new ArrayList();

//Todo orgernize the list

// sort the types
 sort(result, new Comparator() {
  public int compare(Object a, Object b) {
   ChannelCstype cs1 = (ChannelCstype) a;
   ChannelCstype cs2 = (ChannelCstype) b;
   int s1 = cs1.getSort() != null ? cs1.getSort().intValue() : 0;
   int s2 = cs2.getSort() != null ? cs2.getSort().intValue() : 0;
   return s1 - s2;
  }
 });
 return result;

}

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