Complete Java SE 8 Developer Bootcamp - Collections

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Information Technology (IT), Architecture
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University
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key feature of an ArrayList that differentiates it from a regular array?
It is dynamically resizable.
It does not allow duplicate elements.
It is statically sized.
It can store only integers.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method is used to add elements to an ArrayList?
insert()
add()
push()
append()
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the toString method do when called on an ArrayList?
Removes all elements from the list.
Converts the list to a string representation.
Sorts the elements in the list.
Adds a new element to the list.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method is used to determine the number of elements in an ArrayList?
size()
count()
length()
capacity()
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you remove an element from an ArrayList?
By using the erase() method.
By using the discard() method.
By using the remove() method.
By using the delete() method.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to override the equals method for objects stored in a collection?
To prevent duplicate elements.
To ensure objects are stored in alphabetical order.
To allow the collection to compare objects correctly.
To increase the speed of adding elements.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What concept allows collections to be easily replaced with one another?
Encapsulation
Inheritance
Abstraction
Polymorphism
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