CODEWITHSUNDEEP
javalambdajava-8java-stream
quma
quma

Reputation: 5733

Java 8 - fill ArrayList

Is there a better way to fill an ArrayList like this (I have done it like this in Java 7): 

List<ScheduleIntervalContainer> scheduleIntervalContainers = new ArrayList<>();
scheduleIntervalContainers.add(scheduleIntervalContainer);

Upvotes: 7

Views: 10650

Answers (1)

Tunaki
Tunaki

Reputation: 137084

To fill a List, it is possible to generate an infinite Stream using Stream.generate(s) and then limit the number of results with limit(maxSize).

For example, to fill a List of 10 new ScheduleIntervalContainer objects:

List<ScheduleIntervalContainer> scheduleIntervalContainers = 
        Stream.generate(ScheduleIntervalContainer::new).limit(10).collect(toList());

The generate method takes a Supplier: in this case, the supplier is a method reference creating new instance of ScheduleIntervalContainer each time.

Upvotes: 14

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