Java Collections Framework MCQs Questions | Java Program MCQs Page-3 section-1

21.
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()`

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22.
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. It sorts the collection

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23.
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`

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24.
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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25.
Which method is used to remove all elements from a collection in the Java Collections Framework?

A. `clear()`

B. `removeAll()`

C. `erase()`

D. `purge()`

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26.
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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27.
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()`

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28.
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. A `LinkedHashSet` allows duplicate elements, while a `HashSet` does not

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29.
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()`

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30.
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

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Java Collections Framework MCQs Questions | Java Program MCQs

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

Read More Section(Collections Framework in java)

21.
In Java, which method is used to add an element to a collection in the Java Collections Framework?

22.
What is the purpose of the `toArray()` method in the Java Collections Framework?

23.
In the Java Collections Framework, which class provides methods to manipulate the size of a list and its elements?

24.
What is the purpose of the `Iterator` interface in the Java Collections Framework?

25.
Which method is used to remove all elements from a collection in the Java Collections Framework?

26.
What is the purpose of the `Map.Entry` interface in the Java Collections Framework?

27.
In the Java Collections Framework, which method is used to obtain a synchronized (thread-safe) version of a collection?

28.
What is the primary difference between a `HashSet` and a `LinkedHashSet` in the Java Collections Framework?

29.
In Java, which method is used to obtain a synchronized (thread-safe) map from an existing map in the Java Collections Framework?

30.
What is the purpose of the `Collections.reverse()` method in the Java Collections Framework?