PreTrainingCollectionsArrays

Which of the following is a difference between an Array and an ArrayList?

• Arrays can change in size

• ArrayLists can store primitive values

• Arrays are not a class in the collections Framework

• ArrayLists can be created with an array literal

How do we retrieve an element at a particular index from an ArrayList?

• using square brackets

• using the find method

• using the get method

• using the pop method

True/False: collections can contain primitive variables

• True

• False

Which of the following is true for a HashMap?

• HashMaps can be used in a for-each loop

• HashMaps can store duplicate keys

• HashMaps store entries in Key,Value pairs

• HashMaps can store primitive values

Queues store values in __in, __out order

• Last, First

• First, Last

• First, First

Stacks store values in __in, __out order

• Last, Last

• First, First

• Last, First

To pull an element from a queue and reduce the size by 1, we use the ____ method

• find

• push

• poll

• get

Array indexes start at _

• 0

• 1

• 10

• 11

To get the 5th item in an array or ArrayList, we would get index _

• 6

• 5

• 4