Java Collections Framework MCQs Questions

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Each section contains 100 MCQs on Collections Framework in java .

In Java, which method is used to add an element to a collection in the Java Collections Framework?

A) `insert()` B) `put()` C) `add()` D) `append()`

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

What is the purpose of the `toArray()` method in the Java Collections Framework?

A) It sorts the collection B) It converts a collection to an array C) It reverses the collection D) None of These

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In the Java Collections Framework, which class provides methods to manipulate the size of a list and its elements?

A) `Set` B) `ArrayList` C) `Collections` D) `List`

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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

A) It defines a comparison function for ordering elements B) It represents a synchronized collection C) It provides methods for hashing elements D) It provides a way to iterate over a collection's elements

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Which method is used to remove all elements from a collection in the Java Collections Framework?

A) `clear()` B) `removeAll()` C) `erase()` D) `purge()`

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

A) It provides methods for hashing elements B) It represents a synchronized collection C) It defines a comparison function for ordering elements D) It represents a key-value pair in a map

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

In the Java Collections Framework, which method is used to obtain a synchronized (thread-safe) version of a collection?

A) `synchronize()` B) `synchronizedList()` C) `Collections.synchronizedCollection()` D) `makeSynchronized()`

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

What is the primary difference between a `HashSet` and a `LinkedHashSet` in the Java Collections Framework?

A) A `LinkedHashSet` allows duplicate elements, while a `HashSet` does not B) A `LinkedHashSet` maintains the insertion order of elements, while a `HashSet` does not C) A `HashSet` allows duplicate elements, while a `LinkedHashSet` does not D) None of These

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In Java, which method is used to obtain a synchronized (thread-safe) map from an existing map in the Java Collections Framework?

A) `makeSynchronizedMap()` B) `synchronized()` C) `Collections.synchronizedMap()` D) `synchronizeMap()`

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

What is the purpose of the `Collections.reverse()` method in the Java Collections Framework?

A) It removes all elements from a list B) It sorts a list in ascending order C) It adds elements to a list D) It reverses the order of elements in a list

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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Java Collections Framework MCQs Questions | Java Program MCQs