Java Collections Framework MCQs Questions

1

What is the purpose of the Java Collections Framework?

A) To provide a unified architecture for representing and manipulating collections B) To provide a way to create arrays C) To define primitive data types D) To handle exceptions

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Answer & Solution

Answer: Option A

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2

Which interface in the Java Collections Framework represents an ordered collection of elements that can contain duplicate values?

A) `Collection` B) `Map` C) `Set` D) `List`

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Answer & Solution

Answer: Option D

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3

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

A) A `Set` allows duplicate elements, while a `List` does not B) A `List` is unmodifiable, while a `Set` is modifiable C) A `List` allows duplicate elements, while a `Set` does not D) A `Set` is indexed, while a `List` is not

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Answer & Solution

Answer: Option C

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4

Which class is typically used to implement a `List` in the Java Collections Framework?

A) `HashMap` B) `ArrayList` C) `LinkedList` D) None of These

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Answer & Solution

Answer: Option B

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5

In the Java Collections Framework, which interface extends the `List` interface to provide more efficient insertions and deletions in the middle of the list?

A) `Map` B) `Set` C) `Deque` D) `Queue`

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Answer & Solution

Answer: Option C

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6

What is the purpose of the `Map` interface in the Java Collections Framework?

A) To store a collection of objects B) To provide a stack data structure C) To store unique elements D) To store key-value pairs

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Answer & Solution

Answer: Option D

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7

Which class is typically used to implement a `Map` in the Java Collections Framework?

A) `HashMap` B) `ArrayList` C) `HashSet` D) `LinkedList`

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Answer & Solution

Answer: Option A

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8

What is the primary difference between a `HashMap` and a `TreeMap` in the Java Collections Framework?

A) A `TreeMap` uses a linked list to store elements B) A `HashMap` is synchronized, while a `TreeMap` is not C) A `TreeMap` allows duplicate keys, while a `HashMap` does not D) A `HashMap` does not maintain order, while a `TreeMap` does

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Answer & Solution

Answer: Option D

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9

In the Java Collections Framework, which interface represents a collection of unique elements with no duplicates?

A) `List` B) `Map` C) `Set` D) `Collection`

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Answer & Solution

Answer: Option C

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10

Which class is typically used to implement a `Set` in the Java Collections Framework?

A) `HashMap` B) `HashSet` C) `LinkedList` D) None of These

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Answer & Solution

Answer: Option B

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Java Collections Framework MCQs Questions | Java Program MCQs