List排序怎么用Collections.sort和Comparator

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/**
* 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;
}

另一个

/**
* 递归对tree进行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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