How can I convert following code to Java 8

Question

I have written a following code in imperative style that is working fine . but i want to convert it to java 8 , I have tried it but could not able to get in most elegant way .

List<Wrapper> futureList = new ArrayList<>();
List<Wrapper> pastList = new ArrayList<>();
List<Wrapper> list = fooRepository.findAll();
for(Wrapper data : list){
  if(data.getSchedule().toInstant().isAfter(new Date().toInstant())
       futureList.add(data);
   else
       pastList.add(data);     
 }

Tomasz Linkowski · Accepted Answer · 2018-08-13 17:27:40Z

3

Well, the easiest thing to do if you want to use Streams is using Collectors.partitioningBy like that:

Map<Boolean, List<Wrapper>> map = list.stream()
        .collect(Collectors.partitioningBy(data -> data.getSchedule().toInstant().isAfter(Instant.now())));
List<Wrapper> pastList = map.get(false);
List<Wrapper> futureList = map.get(true);

answered Aug 13, 2018 at 17:27

Tomasz Linkowski

4,50626 silver badges40 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

naila naseem Over a year ago

thanks . where from i can learn this type of techniques in java 8 ?

Tomasz Linkowski Over a year ago

Just Google "java stream tutorial" - the very first result (Java 8 Stream Tutorial) looks quite promising. Later on, consult the JavaDocs: java.util.stream, Stream, Collectors classes.

Collectives™ on Stack Overflow

How can I convert following code to Java 8

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related