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.

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?

Collection.sort(listObj);

Collections.sort(listObj);

listObj.sort();

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?

Both are able to access the object

ConcurrentModificationException is thrown

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

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?

Both are same

Arrays.asList() throws compilation error

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

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?

length() and size() return the same value

length() is not defined in ArrayList

size() is not defined in ArrayList

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?

ArrayList

CopyOnWriteArrayList

HashList

List

Discuss

Answer: (b).CopyOnWriteArrayList

Q26.

Which of the below is not an implementation of List interface?

RoleUnresolvedList

Stack

AttibuteList

SessionList

Discuss

Answer: (d).SessionList

Q27.

What is the worst case complexity of accessing an element in ArrayList?

O(n)

O(1)

O(nlogn)

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?

True

False

May be

Can't say

Discuss

Answer: (a).True

Q29.

What is the default clone of HashSet?

Deep clone

Shallow clone

Plain clone

Hollow clone

Discuss

Answer: (b).Shallow clone

Q30.

Do we have get(Object o) method in HashSet.

True

False

May be

Can't say

Discuss

Answer: (b).False

Page 3 of 18

Welcome to the java util MCQs Page

java util MCQs | Page 3 of 18

Explore more Topics under Java Programming

Language Fundamentals

Data Types,Variables and Arrays

Operators and Control Statements

Classes and Methods

Inheritance

String Handling

java lang and java io

Serialization and Networking

Exception Handling in Java

Multithreading

IO and Applets

Event Handling

Interfaces and Packages

Session Management,JSP and Servlet

Miscellaneous Topics in Java

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