Sort Java Collection

user_710051 0
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I have a Java collection:

Collection<CustomObject> list = new ArrayList<CustomObject>();

CustomObject has an id field now before display list I want to sort this collection by that id.

Is there any way I could that do that?

collections sorting java
15 Answers

You can use java Custom Class for the purpose of sorting.

Admin1

Your example:

Collection<CustomObject> list = new ArrayList<CustomObject>();

You can also use a comparator:

list.sort(Comparator.comparingLong(CustomObject::getSomethingToCompare));

Just replace the comparingLong method, there are quite a few options, but it depends on what you want to pass on the "getSomethingToCompare".

This link may help too.

user_128343880

To be super clear, Collection.sort(list, compartor) does not return anything so something like this list = Collection.sort(list, compartor); will throw an error (void cannot be converted to [list type]) and should instead be Collection.sort(list, compartor)

user_139793470
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