1. In the Towers of Hanoi puzzle there are __________________ disks of different diameters.

a) 2

b) 3

c) 4

d)5

e) The Towers of Hanoi puzzle can include any number of disks of different diameters.

2. __________________ recursion results from the lack of a base case.

a) Indirect

b) Direct

c) Infinite

d) Spiral

e) none of the above

3. Suppose we would like to declare a generic type Group that only allows types that implement the Comparable interface. Which of the following declarations correctly declares such a class?

a) class Group

b) class Group

c) class Group

d) class Group>

e) class Group

4. A(n) ___________________ is an object that serves as a repository for other objects.

a) set

b) collection

c) class

d) interface

e) none of the above

5. A nonlinear collection is one in which the elements are stored in a straight line.

a) True

b) False

6. If you want to store non-duplicated objects in the order in which they are inserted, you should use ____________.

c) HashSet

d) LinkedHashSet

e) TreeSet

f) ArrayList

g) LinkedList