But! You can achieve the same functionality of nested streams using map() and flatMap() methods.
Example:import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class NestedStreamExample {
public static void main(String[] args) {
List<List<String>> nestedList = Arrays.asList(
Arrays.asList("A", "B", "C","D"),
Arrays.asList("E", "F","H","I")
);
List<String> flattenedList = nestedList.stream()
.flatMap(List::stream)
.collect(Collectors.toList());
System.out.println(flattenedList);
}
}
We here have a nested list of Strings. When we use the flatMap() along with List::stream we are flattening the nested structure.
Note that the inner stream() call converts each inner list into a stream, and flatMap() combines these streams into a single stream of Strings.
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Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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