Java 8 lambda get and remove element from list

Question

Given a list of elements, I want to get the element with a given property and remove it from the list. The best solution I found is:

Produce         


        

Answer 1

When we want to get multiple elements from a List into a new list (filter using a predicate) and remove them from the existing list, I could not find a proper answer anywhere.

Here is how we can do it using Java Streaming API partitioning.

Map> classifiedElements = producersProcedureActive
    .stream()
    .collect(Collectors.partitioningBy(producer -> producer.getPod().equals(pod)));

// get two new lists 
List matching = classifiedElements.get(true);
List nonMatching = classifiedElements.get(false);

// OR get non-matching elements to the existing list
producersProcedureActive = classifiedElements.get(false);

This way you effectively remove the filtered elements from the original list and add them to a new list.

Refer the 5.2. Collectors.partitioningBy section of this article.