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Quiz on LinkedList in Java Collection

Quiz on LinkedList in Java Collection

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Question 1 of 10

1. Question

What is a LinkedList in Java?

A fixed-size array
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A class for handling files
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A linear data structure where elements are linked using pointers
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A class used only for sorting
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Question 2 of 10

2. Question

Which interface does LinkedList implement?

List only
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Queue only
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Both List and Deque
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Map
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Question 3 of 10

3. Question

Which of the following is true about LinkedList?

It allows random access of elements
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It does not allow null values
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It allows duplicates and null elements
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It is synchronized by default
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Question 4 of 10

4. Question

Which method adds an element to the end of a LinkedList?

addFirst()
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insert()
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append()
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add()
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Question 5 of 10

5. Question

What is the time complexity of inserting an element at the beginning of a LinkedList?

O(n)
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O(1)
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O(log n)
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O(n²)
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Question 6 of 10

6. Question

Which method is used to remove the first element of a LinkedList?

delete()
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removeFirst()
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pop()
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clear()
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Question 7 of 10

7. Question

Can LinkedList be used as a queue and stack in Java?

No
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Only as queue
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Only as stack
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Yes, it supports both
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Question 8 of 10

8. Question

What is returned by peek() method in LinkedList?

Removes and returns the first element
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Returns the last element
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Returns but does not remove the first element
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Returns size of the list
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Question 9 of 10

9. Question

Which package contains the LinkedList class?

java.io
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java.util
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java.lang
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java.collection
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Question 10 of 10

10. Question

What happens if poll() is called on an empty LinkedList?

Throws exception
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Returns null
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Returns 0
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Waits for input
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