How to use Collections.sort and Comparator in List sorting
Editor to share with you how to use Collections.sort and Comparator for List sorting. I hope you will get something after reading this article. Let's discuss it together.
/ * *
* 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
}
The other one
/ * *
* Recursively sort the tree
*
* @ param channelCsTypes
, /
Private void sort (List channelCsTypes, Comparator compara) {
If (channelCsTypes = = null | | channelCsTypes.size () < 1)
Return
For (int I = 0; I < channelCsTypes.size (); iTunes +) {
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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