Question 20 (2 points)

The concrete classes that implement the List interface are

Question 20 options:

	AbstractList, AbstractSequentialList, and List
	LinkedList, ArrayList, and Vector
	LinkedList, ArrayList, and AbstractList
	None of the above

Question 21 (1 point)

Comparator

Question 21 options:

	specifies two methods, compare and equals
	specifies two methods, compare and compareTo
	specifies a single method, compareTo
	specifies three methods, compareTo, compare, and equals

Question 22 (1 point)

A TreeSet

Question 22 options:

	is like a Set that allows elements to be retrieved according to their natural order, or according to an order specified by a Comparator
	is a Set that allows elements to be retrieved in the order added
	is like a Set, only it is faster
	is a Set that organizes its elements in a tree according to the inheritance hierarchy of the elements

Question 23 (1 point)

A HashMap

Question 23 options:

	uses hash codes to store keys
	is a subclass of HashSet that implements the Map interface
	is a subclass of Map that implements the HashCode interface
	None of the above

Question 24 (1 point)

A LinkedHashMap

Question 24 options:

	provides an iterator that can be used to retrieve its elements
	is an unordered collection that provides no control over the order of retrieval of stored elements
	can be set up to maintain its keys in insert or access order
	None of the above

Question 25 (1 point)

Collections

Question 25 options:

	is a class that contains static methods for working with collections
	is the interface from which all collection interfaces are derived
	is the superclass of all abstract and concrete collection classes
	None of the above