We can convert a stream to set using the following ways.
Using stream.collect() with Collectors.toSet() method - Stream collect() method iterates its elements and stores them in a collection.collect(Collector.toSet()) method.
Using set.add() method - Iterate stream using forEach and then add each element to the set.
import java.util.*; import java.util.stream.Stream; import java.util.stream.Collectors; public class Tester { public static void main(String[] args) { Stream<String> stream = Stream.of("a","b","c","d"); // Method 1 Set<String> set = stream.collect(Collectors.toSet()); set.forEach(data -> System.out.print(data + " ")); Stream<String> stream1 = Stream.of("a","b","c","d"); System.out.println(); //Method 2 Set<String> set1 = new HashSet<>(); stream1.forEach(set1::add); set1.forEach(data -> System.out.print(data + " ")); } }
a b c d a b c d