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public class Test {
	public static void main(String[] args) {
		List<TAdslot> userList = new ArrayList<>();
		TAdslot adslot1 = new TAdslot();
		adslot1.setName("One");
		adslot1.setNameList(Lists.newArrayList("A","B","C"));
		TAdslot adslot2 = new TAdslot();
		adslot2.setName("Zero");
		adslot2.setNameList(Lists.newArrayList("D","E","F"));
		TAdslot adslot3 = new TAdslot();
		adslot3.setName("Two");
		adslot3.setNameList(Lists.newArrayList("H","I","J"));
		TAdslot adslot4 = new TAdslot();
		adslot4.setName("Four");
		userList.add(adslot1);
		userList.add(adslot2);
		userList.add(adslot3);
		userList.add(adslot4);
			List<String> stringList = userList.stream().map(TAdslot::getName).collect(Collectors.toList());
		System.out.println(stringList);
		List<String> userListStr = userList.stream().map(TAdslot::getNameList).filter(Objects::nonNull).flatMap(List::stream).collect(Collectors.toList());
		System.out.println(userListStr);
	}
}
@Data
class TAdslot {
	public String name;
	public List<String> nameList;
}