From the Java docs of removeAll() in Set:
throws NullPointerException - if this set contains a null element and the specified collection does not permit null elements
If we go by the above statement, the following code should not throw a null pointer exception; however, when I run this program, I am getting one.
public class Test {
public static void main(String[] args) {
Set<String> s = new TreeSet<String>();
s.add("A");
s.add("B");
Set<?> s1 = new HashSet<Object>();
s1.add(null);
s.removeAll(s1);
}
}
Can some one tell me why I am getting an exception here?
