Virtusa Consulting Services Senior Java Developer Interview Questions and Answers

Object-oriented programming (OOP) is a programming paradigm that uses objects to represent and manipulate data.

• Encourages modular and reusable code

• Provides a clear structure and organization to the code

• Allows for easier maintenance and updates

• Supports code reusability through inheritance and polymorphism

• Enables encapsulation, hiding the internal details of an object

• Promotes code extensibility and scalability

• Facilitates...read more

I want to join ATOS because of their reputation for innovation and their commitment to employee growth and development.

• ATOS is known for its innovative solutions in the software development industry.

• I am impressed by ATOS's focus on employee growth and development through training programs and career advancement opportunities.

• ATOS has a strong reputation for delivering high-quality software solutions to its clients.

• I b...read more

Reverse a linked list using iterative and recursive methods.

• Iterative method involves traversing the list and changing the pointers to reverse the order.

• Recursive method involves calling the function recursively on the next node and changing the pointers.

• Both methods have O(n) time complexity and O(1) space complexity.

• Example: 1->2->3->4->5 becomes 5->4->3->2->1.

The question asks to input an array and print the repeating characters.

• Iterate through the array and store each element in a hash table or dictionary.

• If an element already exists in the hash table, it is a repeating character.

• Print all the repeating characters found.

Program to find the second minimum in an array.

• Sort the array and return the second element.

• Initialize two variables to store minimum and second minimum values.

• Loop through the array and update the variables accordingly.

To find the longest palindrome in a given string.

• Iterate through the string and check for palindromes of odd and even lengths.

• Keep track of the longest palindrome found so far.

• Use two pointers to check if the substring is a palindrome.

• If the substring is a palindrome and its length is greater than the current longest palindrome, update the longest palindrome.

Find the next higher number with equal number of ones in binary representation.

• Convert input number to binary

• Count number of ones in binary representation

• Increment input number until binary representation has equal number of ones

• Convert incremented number to decimal

Find the duplicate number in an array of 10 numbers with only 2 steps.

• Use a hash set to keep track of visited numbers.

• Iterate through the array and check if the number is already in the set.

• If it is, then it is the duplicate number.

• If not, add it to the set.

• At the end, the duplicate number will be found.

Program to print elements of a linked list in reverse order using same single linked list

• Traverse the linked list and push each element onto a stack

• Pop elements from the stack and print them in reverse order

To check the occurrence and correctness of HTML tags, we can use various tools and techniques.

• One way is to use a browser's developer tools to inspect the HTML code and see the tags and their frequency.

• Another way is to use an online HTML validator tool that checks for correct syntax and tag usage.

• We can also use programming languages like Python to parse HTML and count the occurrence of each tag.

• Regular expressions ca...read more

High severity refers to critical defects that impact the core functionality of the software, while low severity refers to minor issues that have minimal impact on functionality.

• High severity issues can cause the software to crash or result in data loss.

• Low severity issues are cosmetic or minor usability problems.

• From a QA point of view, high severity issues are more critical as they can significantly impact the user ex...read more

Test scenarios for a login form with username, password, and remember-me functionality.

• Verify that the form loads correctly with all fields present.

• Test valid username and password submission to ensure successful login.

• Test invalid username and/or password to check for appropriate error messages.

• Check the remember-me functionality by logging in, closing the browser, and reopening it to see if the user remains logged in...read more

Interface defines only method signatures while abstract class can have both method signatures and implementations.

• An interface can be implemented by multiple classes while an abstract class can only be extended by one class.

• An abstract class can have constructors while an interface cannot.

• An abstract class can have instance variables while an interface cannot.

• An abstract class can provide default implementations for so...read more

To store and print numbers from an array using arrayList.

• Create an arrayList object

• Loop through the array and add each element to the arrayList using add() method

• Print the arrayList using toString() method

• Example: int[] arr = {1, 2, 3}; ArrayList list = new ArrayList<>(); for(int num : arr) { list.add(num); } System.out.println(list.toString());

Test scenario for download functionality of a songs website

• Verify that the download button is visible and clickable

• Check that the downloaded file is in the correct format

• Ensure that the downloaded file is not corrupted

• Test the download speed for different file sizes

• Verify that the download progress is displayed to the user