Answers to Self-Review Exercises
a) Iterator.
b) index.
c) autoboxing.
d) ArrayList, Vector.
e) double.
f) unmodifiable wrapper.
g) auto-unboxing.
h) disjoint.
a) False. Autoboxing occurs when adding a primitive type to a collection, which means the primitive type is converted to its corresponding type-wrapper class.
b) False. A Set cannot contain duplicate values.
c) False. A Map cannot contain duplicate keys.
d) True.
e) False. Collections is a class; Collection is an interface.
f) True.
g) False. As the load factor increases, fewer slots are available relative to the total number of slots, so the chance of a collision increases.
h) False. Attempting to insert a null element causes a NullPointerException.
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