Answer: null value and List : Questions « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Questions

A. 

Yes, a null value may be added to any List.


import java.util.ArrayList;
import java.util.List;

public class MainClass {
  public static void main(String[] argv) {
    List list = new ArrayList();
    list.add(null);
    System.out.println();
  }
}