Raptors Java week 11 lab

Question 1

What type of collection in Java does not maintain the insertion order?

Accepted Answer

HashMap

Question 2

In Java, which interface provides a method to traverse through the elements of a collection backward?

Accepted Answer

Iterator

Question 3

What is the primary difference between a Set and a List in Java?

Accepted Answer

Lists allow duplicate elements, Sets do not.

Question 4

What is the primary function of the 'next' method in the Iterator interface in Java?

Accepted Answer

To move the iterator to the next element in the iteration

Question 5

In Java, which collection guarantees no duplicate elements?

Accepted Answer

HashSet

Question 6

What method is used to add an element to the beginning of a Vector in Java?

Accepted Answer

add()

Question 7

What method is used to check if a Vector in Java contains a specific element?

Accepted Answer

contains()

Question 8

Which class in Java implements the Deque interface and allows for operations at both ends?

Accepted Answer

ArrayDeque

Question 9

Which one of the following is not a part of the Collection Framework in Java?

Accepted Answer

Array

Question 10

What is the purpose of the 'remove' method in Java's Iterator interface?

Accepted Answer

To remove the current element in the iteration

Question 11

What is the primary difference between a Vector and an ArrayList in Java?

Accepted Answer

Vectors are synchronized, ArrayLists are not.

Question 12

Which of the following implementations in Java allows duplicate elements but maintains insertion order?

Accepted Answer

LinkedHashMap

Question 13

What is the primary difference between an ArrayList and a Vector in Java?

Accepted Answer

Vector allows for faster element retrieval.

Question 14

In Java, which collection ensures that elements are processed in the order they were added?

Accepted Answer

list

Question 15

What is the purpose of an Iterator in Java Collections?

Accepted Answer

To traverse elements in a collection

Question 16

In the context of collections, what does "synchronized" mean in Java?

Accepted Answer

It ensures thread safety by allowing only one thread at a time .

Question 17

In Java, which collection allows elements to be accessed in Last-In-First-Out (LIFO) order?

Accepted Answer

Stack

Question 18

What method is used to obtain an element at a specific index from a Vector in Java?

Accepted Answer

elementAt()

Question 19

Which data structure in Java allows elements to be accessed based on an index?

Accepted Answer

Vector

Question 20

Which method is used to add an element to a Vector in Java?

Accepted Answer

add()

Question 21

Which interface in Java extends the Collection interface to handle elements in a specific order?

Accepted Answer

Set

Question 22

What interface in Java is used to represent a group of individual objects?

Accepted Answer

List

Question 23

Which method is used to remove all elements from a Collection in Java?

Accepted Answer

clear()

Question 24

What happens if you try to access an element beyond the size of the Vector in Java?

Accepted Answer

It throws an ArrayIndexOutOfBoundsException.

Question 25

In Java, which collection does not allow null elements?

Accepted Answer

HashSet

Question 26

What is the legacy class in Java that provides a synchronized implementation of a dynamic array?

Accepted Answer

Vector

Question 27

In Java, what is the primary advantage of using an Iterator over a traditional for loop to iterate through a Collection?

Accepted Answer

Iterators offer a more concise and readable way to traverse collections.

Raptors Java week 11 lab

Questions 27

Raptors Java week 11 lab

Questions 27