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import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
public class FinderDemo {
public static void main(String[] args) {
List strings = Arrays.asList("this", "is", "a", "list", "of", "strings");
HashSet stringSet = new HashSet(strings);
Optional first = strings.stream()
.filter(s -> {
System.out.println(Thread.currentThread().getName() + " with " + s);
return s.length() == 2;
})
.findFirst();
System.out.println(first);
}
}