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Collectors partitioningBy() method in Java 8
The partioningBy() method returns a Collector that partitions the input elements according to a Predicate, and organizes them into a Map<Boolean, List<T>>.
The syntax is as follows.
static <T> Collector<T,?,Map<Boolean,List<T>>> partitioningBy(Predicate<? super T> predicate)
Here, the parameter,
T − Type of the input elements
predicate − For organizing input elements
To work with Collectors class in Java, import the following package.
import java.util.stream.Collectors;
The following is an example to implement partitioningBy() method in Java.
Example
import java.util.Map;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
Stream<Integer> stream = Stream.of(25, 50, 75, 100, 125, 150);
// true for stream element 50
Map<Boolean, List<Integer>> m = stream.collect(Collectors.partitioningBy(a -> a == 50));
System.out.println("Stream = "+ m);
}
}Output
Stream = {false=[25, 75, 100, 125, 150], true=[50]}
Updated on: 30-Jul-2019
1K+ Views
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