How to convert Stream to TreeSet in Java?

Let us first create a Stream:

Stream<String> stream = Stream.of("UK", "US", "India", "Australia", "Armenia", "Canada", "Poland");

Now convert Stream to TreeSet:

Set<String> set = stream.collect(Collectors.toCollection(TreeSet::new));

The following is an example to convert String to TreeSet in Java:

Example

import java.util.Set; import java.util.TreeSet; import java.util.stream.Collectors; import java.util.stream.Stream; public class Demo {    public static void main(String[] args) {       Stream<String> stream = Stream.of("UK", "US", "India", "Australia", "Armenia", "Canada", "Poland");       Set<String> set = stream.collect(Collectors.toCollection(TreeSet::new));       set.forEach(val -> System.out.println(val));    } }

Output

Armenia Australia Canada India Poland UK US