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Welcome to the java util MCQs Page

Dive deep into the fascinating world of java util with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of java util, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of java util, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Java Programming.

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Check out the MCQs below to embark on an enriching journey through java util. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Java Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of java util. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

java util MCQs | Page 3 of 18

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Q21.
How to sort elements of ArrayList?

a.

Collection.sort(listObj);

b.

Collections.sort(listObj);

c.

listObj.sort();

d.

Sorter.sortAsc(listObj);

Discuss
Answer: (b).Collections.sort(listObj);
Q22.
When two threads access the same ArrayList object what is the outcome of the program?

a.

Both are able to access the object

b.

ConcurrentModificationException is thrown

c.

One thread is able to access the object and second thread gets Null Pointer exception

d.

One thread is able to access the object and second thread will wait till control is passed to the second one

Discuss
Answer: (b).ConcurrentModificationException is thrown
Q23.
How is Arrays.asList() different than the standard way of initialising List?

a.

Both are same

b.

Arrays.asList() throws compilation error

c.

Arrays.asList() returns a fixed length list and doesn’t allow to add or remove elements

d.

We cannot access the list returned using Arrays.asList()

Discuss
Answer: (c).Arrays.asList() returns a fixed length list and doesn’t allow to add or remove elements
Q24.
What is the difference between length() and size() of ArrayList?

a.

length() and size() return the same value

b.

length() is not defined in ArrayList

c.

size() is not defined in ArrayList

d.

length() returns the capacity of ArrayList and size() returns the actual number of elements stored in the list

Discuss
Answer: (d).length() returns the capacity of ArrayList and size() returns the actual number of elements stored in the list
Q25.
Which class provides thread safe implementation of List?

a.

ArrayList

b.

CopyOnWriteArrayList

c.

HashList

d.

List

Discuss
Answer: (b).CopyOnWriteArrayList
Q26.
Which of the below is not an implementation of List interface?

a.

RoleUnresolvedList

b.

Stack

c.

AttibuteList

d.

SessionList

Discuss
Answer: (d).SessionList
Q27.
What is the worst case complexity of accessing an element in ArrayList?

a.

O(n)

b.

O(1)

c.

O(nlogn)

d.

O(2)

Discuss
Answer: (b).O(1)
Q28.
When an array is passed to a method, will the content of the array undergo changes with the actions carried within the function?

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q29.
What is the default clone of HashSet?

a.

Deep clone

b.

Shallow clone

c.

Plain clone

d.

Hollow clone

Discuss
Answer: (b).Shallow clone
Q30.
Do we have get(Object o) method in HashSet.

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
Page 3 of 18

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