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Quiz on Collections in Java

Quiz on Collections in Java

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Question 1 of 10

1. Question

What is the Java Collections Framework?

A set of database tools
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A library to manage file systems
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A set of classes and interfaces for storing and manipulating groups of data
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A framework for GUI design
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Question 2 of 10

2. Question

Which interface is the root of the Java Collections hierarchy?

Set
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List
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Map
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Collection
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Question 3 of 10

3. Question

Which class implements the List interface?

HashSet
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TreeMap
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ArrayList
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HashMap
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Question 4 of 10

4. Question

Which of the following does not allow duplicate elements?

ArrayList
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LinkedList
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HashSet
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Vector
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Question 5 of 10

5. Question

What is the main difference between ArrayList and LinkedList?

ArrayList is faster for insertion
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LinkedList is better for random access
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ArrayList is backed by an array, LinkedList by nodes
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LinkedList does not support null values
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Question 6 of 10

6. Question

Which interface is used to store key-value pairs?

List
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Set
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Queue
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Map
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Question 7 of 10

7. Question

Which class maintains insertion order?

HashSet
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TreeSet
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LinkedHashSet
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PriorityQueue
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Question 8 of 10

8. Question

Which method is used to add an element to a List?

put()
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insert()
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add()
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push()
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Question 9 of 10

9. Question

What will happen if you try to add a duplicate key in a HashMap?

It throws an error
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The old value is replaced
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The new value is ignored
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Both values are stored
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Question 10 of 10

10. Question

Which of the following is not part of the Java Collections Framework?

ArrayList
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HashMap
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HashTable
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Arrays
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