Iterator.

index.

autoboxing.

ArrayList, Vector.

double.

unmodifiable wrapper.

auto-unboxing.

disjoint.

False. Autoboxing occurs when adding a primitive type to a collection, which means the primitive type is converted to its corresponding type-wrapper class.

False. A Set cannot contain duplicate values.

False. A Map cannot contain duplicate keys.

True.

False. Collections is a class; Collection is an interface.

True.

False. As the load factor increases, fewer slots are available relative to the total number of slots, so the chance of a collision increases.

False. Attempting to insert a null element causes a NullPointerException.