import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
public class Main {
public static void main(final String[] args) {
List<String> names2 = Arrays.asList("peter", null, "anna", "mike", "xenia");
names2.sort(Comparator.nullsLast(String::compareTo));
System.out.println(names2);
}
}