StreamFlatMap.java

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamFlatMap {

	public static void main(String[] args) {

		List<String> list = new ArrayList<>();

		list.add("foo");
		list.add("bar");
		list.add("qux");
		list.add("baz");
		list.add("quux");

		System.out.println(list.size());
		
		list = list.stream().flatMap(text -> {
			if (text.startsWith("qu")) {
				return Stream.of(text, text + "_nha");
			} else {
				return Stream.of(text);
			}
		}).collect(Collectors.toList());
		
		System.out.println(list.size());
		
		for (String text : list) {
			System.out.println(text);
		}
	}
}