Java Collections Quiz

Which of the following is a type of List Interface?

• HashSet

• PriorityQueue

• ArrayList

• TreeSet

Which collection type is sorted and does not allow duplicates?

• ArrayList

• LinkedList

• TreeSet

• Stack

What must you know before instantiating an array?

• The length of the array

• The type of the array

• The name of the array

• The values of the array

What is the primary use of an enhanced for loop in Java?

• To modify elements in an array

• To iterate over all values of an array or ArrayList

• To sort elements in an array

• To reverse elements in an array

What is the main advantage of using an enhanced for loop?

• It allows modification of array elements

• It simplifies the code for iterating over collections

• It increases the speed of execution

• It uses less memory

In a singly linked list, each node contains data and a reference to:

• The previous node

• The next node

• Both previous and next nodes

• The head node

What is a LinkedList very similar to, but functions differently?

• ArrayList

• Stack

• Queue

• Tree

What class does a Stack extend in programming?

• ArrayList

• LinkedList

• Vector

• Queue

Which set implementation is not directly related to a Hash Table?

• HashSet

• LinkedHashSet

• EnumSet

• TreeSet

Which of the following is a characteristic of a Queue?

• First-In-First-Out (FIFO) order

• Last-In-First-Out (LIFO) order

• Random access

• Sorted order