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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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