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Wissen Technology Interview Questions and Answers
121 Interview questions
Flattening a 2D array involves converting it into a 1D array, simplifying data manipulation and access.
Iterate through each row: Use a loop to access each row of the 2D array.
Add elements to a new array: For each element in the row, add it to a new 1D array.
Example: Given [[1, 2], [3, 4]], the result is [1, 2, 3, 4].
Using Streams: In Java 8+, you can use streams to flatten arrays: Arrays.stream(array).flatMap(Arra...
Flattening a 2D array involves converting it into a 1D array by concatenating its elements.
Use a loop to iterate through each row and column of the 2D array.
Create a new 1D array with a size equal to the total number of elements in the 2D array.
Copy each element from the 2D array to the 1D array.
Example: For a 2D array [['a', 'b'], ['c', 'd']], the flattened array is ['a', 'b', 'c', 'd'].
String literals are constant strings defined in code, while the string pool is a memory area where unique string objects are stored.
String literals are created using double quotes, while string pool objects are created using the 'new' keyword.
String literals are stored in the string pool to conserve memory and improve performance.
String literals are automatically interned by the JVM, while string pool objects need...
Add hashCode() and equals() methods to Employee class.
Override hashCode() method to generate a unique hash code for each Employee object.
Override equals() method to compare Employee objects based on their attributes.
Ensure that the attributes used in hashCode() and equals() methods are immutable.
Example: Add id, name, and department attributes to Employee class and override hashCode() and equals() methods based on...
Program to print the 90-degree rotated view of a 2D array.
Iterate through each column in reverse order and print the corresponding row elements.
Repeat this process for all columns to get the rotated view of the 2D array.
Program to reverse a linked list
Create a new linked list to store the reversed elements
Traverse the original linked list and insert each node at the beginning of the new list
Update the head of the new list as the last node of the original list
Ways to create a thread in Java include extending the Thread class, implementing the Runnable interface, and using Java 8's lambda expressions.
Extend the Thread class and override the run() method
Implement the Runnable interface and pass it to a Thread object
Use Java 8's lambda expressions with the Executor framework
HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
HashMap is part of the Java Collections framework.
It allows null keys and values.
Internally, it uses an array of linked lists to handle collisions.
The key's hash code is used to determine the index in the array where the key-value pair is stored.
Example: HashMap<String, Integer> map = new HashMap&l...
Use a Set to remove duplicates from an array of strings.
Create a Set to store unique elements.
Iterate through the array and add each element to the Set.
Convert the Set back to an array to remove duplicates.
Design classes and interfaces for a card game, including card values and suits.
Create a Card class with properties: rank (A, 2-10, J, Q, K) and suit (Hearts, Diamonds, Clubs, Spades).
Implement a Deck class to manage a collection of Card objects, including shuffling and dealing methods.
Define a Game interface with methods like startGame(), endGame(), and playTurn().
Consider creating specific game classes (e.g., Pok...
Wissen Technology Interview Experiences
161 interviews found
S Chakra
Selected
I applied via Naukri.com and was interviewed in Feb 2023. There were 3 interview rounds.
(18 Questions)
- Q1. 1. Can we keep an object of a Class as key in HashMap?
- Q2. 2. What will happen if hashcode only returns a constant? How will it affect the internal working of the HashMap?
- Q3. 3. What if we do not override Equals method ? What is we do not override Hashcode method?
- Ans.
Not overriding equals method can lead to incorrect comparison of objects. Not overriding hashCode method can lead to incorrect behavior in hash-based data structures.
If equals method is not overridden, the default implementation from Object class will be used which compares object references.
This can lead to incorrect comparison of objects where two different objects with same content are considered unequal.
If hashCode...
- Q4. 4. How to make a class immutable?
- Q5. 5. If we have a mutable object inside immutable class then how will you handle it?
- Q6. 6. Advantages and Disadvantages of immutable class?
- Q7. How to sort a list of students on the basis of their First name?
- Q8. Object level Lock vs Class level lock?
- Q9. If there is a class inside it we have a method - public void synchronized M1() - inside method - Thread.Sleep(500); We create 2 different object of the class and invoke the method. Ob1.M1() Ob2.M1() How ...
- Ans.
Synchronized methods ensure that only one thread can execute the method at a time per object.
Synchronized methods lock the object instance, preventing concurrent access.
When Ob1.M1() is called, it locks the instance of the object Ob1.
If Ob2.M1() is called on a different instance, it does not block Ob1's execution.
Both threads will execute M1() one after the other, but independently for each object.
Example: If Ob1 calls...
- Q10. Using Java 8 find the sum of squares of all the odd numbers in the arraylist.
- Q11. LeetCode 1 - Two Sum.
- Q12. LeetCode 20 - Valid Parantheses
- Q13. Parent class has run() and walk() . Parent run() - calls walk() Child Class overrides Parent class Inside run() - calls super.run() Walk() - calls super.walk In main class Parent p = new child() p.ru...
- Q14. LeetCode - 532 , K diff pairs
- Ans.
Find the number of unique k-diff pairs in an array where the absolute difference is k.
Use a HashMap to count occurrences of each number in the array.
Iterate through the keys of the HashMap to find pairs.
For k = 0, count pairs with the same number appearing more than once.
For k > 0, check if (num + k) exists in the HashMap for each num.
- Q15. What is Serialization?
- Q16. Synchronized Map vs Concurrent hashmap
- Q17. Write a query to find name of authors who have written more than 10 books. Table - Bookauthhor Column - Book Column - Author
- Q18. Write a program to return the length of the longest word from a string whose length is even?
(3 Questions)
- Q1. How much salary expectations?
- Ans.
Answer the salary expectations question in an interview for a Java Developer position.
Research the average salary range for Java Developers in your location and level of experience.
Consider your qualifications, skills, and experience when determining your salary expectations.
Be realistic and flexible in your salary expectations, taking into account the company's budget and industry standards.
Provide a salary range rath...
- Q2. Do you have location constraints?
- Q3. Why are you leaving this company?
Interview Preparation Tips
- DSA
- Core Java
- Java 8
- Hashmap
- Multithreading
- OOPS
- Synchronisation
- Serialization
So focus on Core Java and Multi threading.
Java 8.
Practice easy and medium level questions from leetcode
Skills evaluated in this interview
I appeared for an interview in Dec 2024.
(6 Questions)
- Q1. Implement a custom stack that allows fetching the minimum element in constant time, O(1).
- Ans.
Custom stack with constant time access to minimum element
Use two stacks - one to store elements and another to store minimum values
When pushing an element, compare with top of min stack and push the smaller value
When popping an element, pop from both stacks
Access minimum element in O(1) time by peeking at top of min stack
- Q2. How can one create an immutable class named Employee with fields for name and hobbies defined as List
? - Ans.
To create an immutable class named Employee with fields for name and hobbies defined as List<String>, use private final fields and return new instances in getters.
Use private final fields for name and hobbies in the Employee class
Provide a constructor to initialize the fields
Return new instances or unmodifiable lists in the getters to ensure immutability
- Q3. What changes are required in the Employee class to use it as a key for a HashMap?
- Ans.
Add hashCode() and equals() methods to Employee class.
Override hashCode() method to generate a unique hash code for each Employee object.
Override equals() method to compare Employee objects based on their attributes.
Ensure that the attributes used in hashCode() and equals() methods are immutable.
Example: Add id, name, and department attributes to Employee class and override hashCode() and equals() methods based on thes...
- Q4. What is the implementation of the singleton design pattern?
- Ans.
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
Create a private static instance of the class within the class itself.
Provide a public static method to access the instance, creating it if necessary.
Ensure the constructor of the class is private to prevent instantiation from outside the class.
Use lazy initialization to create the instance only when needed.
Thread...
- Q5. Different ways to create a thread
- Q6. What are the SOLID principles in software design, and can you provide examples for each?
- Ans.
SOLID principles are a set of five design principles in object-oriented programming to make software more maintainable, flexible, and scalable.
Single Responsibility Principle (SRP) - A class should have only one reason to change. Example: A class that handles user authentication should not also handle database operations.
Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modific...
(5 Questions)
- Q1. What is the concept of Object-Oriented Programming (OOP) and can you provide an example?
- Ans.
OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
OOP focuses on creating objects that interact with each other to solve a problem.
Encapsulation is a key concept in OOP, where data is kept within an object and only accessible through its methods.
Inheritance allows objects to inherit attributes and methods from parent classes.
Po...
- Q2. How do threads communicate with each other in Java?
- Ans.
Threads communicate in Java through shared memory or message passing.
Threads can communicate through shared variables in memory.
Threads can communicate through synchronized methods or blocks.
Threads can communicate through wait(), notify(), and notifyAll() methods.
Threads can communicate through message passing using classes like BlockingQueue or ExecutorService.
- Q3. Write a program to reverse a linked list.
- Ans.
Program to reverse a linked list
Create a new linked list to store the reversed elements
Traverse the original linked list and insert each node at the beginning of the new list
Update the head of the new list as the last node of the original list
- Q4. What is the difference between string literals and the string pool?
- Ans.
String literals are constant strings defined in code, while the string pool is a memory area where unique string objects are stored.
String literals are created using double quotes, while string pool objects are created using the 'new' keyword.
String literals are stored in the string pool to conserve memory and improve performance.
String literals are automatically interned by the JVM, while string pool objects need to b...
- Q5. What is the program to print the 90-degree rotated view of a 2D array?
- Ans.
Program to print the 90-degree rotated view of a 2D array.
Iterate through each column in reverse order and print the corresponding row elements.
Repeat this process for all columns to get the rotated view of the 2D array.
Interview Preparation Tips
AKSHAY SANJAY ZOTING
I applied via Walk-in and was interviewed in Dec 2024. There were 2 interview rounds.
The assessment consists of basic coding and SQL-related questions, including two challenge questions. The total test duration is 1 hour and 30 minutes, featuring a total of 7 questions, with a passing score of 50% out of 120 points.
(4 Questions)
- Q1. Can you provide an introduction about yourself, including your current place of residence?
- Ans.
I am a Java Developer currently residing in New York City.
Experienced Java Developer
Residing in New York City
Strong knowledge of Java programming language
- Q2. What is a HashMap in Java, and how does it function internally?
- Ans.
HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
HashMap is part of the Java Collections framework.
It allows null keys and values.
Internally, it uses an array of linked lists to handle collisions.
The key's hash code is used to determine the index in the array where the key-value pair is stored.
Example: HashMap<String, Integer> map = new HashMap<>...
- Q3. I was asked to solve a question related to a 2D array that involved iterating through the array and storing the elements in a new array.
- Q4. Find second highest salary from employee table?
Interview Preparation Tips
Senior Talent Acquisition Consultant Interview Questions & Answers
pankhuri shastri
posted on 2 Mar 2025
Selected
I appeared for an interview in Feb 2025.
(2 Questions)
- Q1. Tell me about your overall experience in Recruitment
- Ans.
I have over 8 years of experience in recruitment across various industries and roles.
Managed end-to-end recruitment process including sourcing, screening, interviewing, and onboarding.
Utilized various recruitment tools and platforms to attract top talent.
Developed and maintained strong relationships with hiring managers and candidates.
Implemented recruitment strategies to improve time-to-fill and quality of hires.
Condu...
- Q2. Highlight the job boards that you have used
- Ans.
I have utilized job boards such as Indeed, LinkedIn, Glassdoor, and Monster.
Indeed
LinkedIn
Glassdoor
Monster
(1 Question)
- Q1. Analytical question
(1 Question)
- Q1. Salary negotiation and discussion
I applied via LinkedIn and was interviewed in Dec 2024. There were 2 interview rounds.
(2 Questions)
- Q1. OOPS concepts, SOLID principles, design patterns Thread vs Task
- Q2. C# coding questions and SQL questions
(2 Questions)
- Q1. Second round was technical + managerial round
- Q2. Asked some scenario based questions in sql and .NET
Bharat Burle
I applied via Company Website and was interviewed in Nov 2024. There were 2 interview rounds.
There were 3 to 4 questions related to the camera that needed to be solved within the given time.
(4 Questions)
- Q1. Postmortem of Hashmap
- Q2. Locking mechanism in multithreading
- Ans.
Locking mechanism in multithreading is used to control access to shared resources by multiple threads.
Locks are used to prevent multiple threads from accessing shared resources simultaneously
Types of locks include synchronized blocks, ReentrantLock, and ReadWriteLock
Locks help prevent race conditions and ensure data consistency in multithreaded applications
- Q3. Find highest salaried emp from each dept
- Ans.
Use SQL query to group by department and find employee with highest salary in each department
Write a SQL query to group by department and select max salary for each department
Join the result with employee table to get employee details
Example: SELECT dept, emp_name, MAX(salary) FROM employees GROUP BY dept
- Q4. Sorting algorithms
Interview Preparation Tips
- Java fundamentals
- DS
- Multithreading
- SQL
I applied via Approached by Company
(2 Questions)
- Q1. Design classes, and interfaces for Card(taash ke patte) games. Numbers from A, 2, 3, ..., symbol of 10,11... was given.
- Ans.
Design classes and interfaces for a card game, including card values and suits.
Create a Card class with properties: rank (A, 2-10, J, Q, K) and suit (Hearts, Diamonds, Clubs, Spades).
Implement a Deck class to manage a collection of Card objects, including shuffling and dealing methods.
Define a Game interface with methods like startGame(), endGame(), and playTurn().
Consider creating specific game classes (e.g., PokerGam...
- Q2. Streams - flat map
Interview Preparation Tips
- Streams
- Low level design
- Array problems
I appeared for an interview in Nov 2024.
Coding test was easy. They asked LC easy anyone with fair understanding of programming can easily solve it.
(2 Questions)
- Q1. Asked a question from Blind 75 that i dont remember as of now. I kind of stumbled here yet gave a code for original question
- Q2. Asked LC hard question. Interviewer was very rude and did not give a shit about my approach when I tried to explain it to him/her. He said just run code against test cases provided. I received rejection ...
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(2 Questions)
- Q1. Convert given Object array into integer list provided object array may contain array of objects
- Ans.
Convert an object array to an integer list, handling nested arrays of objects.
Use recursion to handle nested arrays. Example: [1, '2', [3, '4']] becomes [1, 2, 3, 4].
Check each element's type; convert strings to integers. Example: '5' -> 5.
Filter out non-integer convertible values. Example: ['a', 1] results in [1].
Utilize Java Streams for a concise solution if using Java.
- Q2. Merge given sorted arrays into single sorted array
Hackearth online coding test for 1 hour
(2 Questions)
- Q1. Dsa question and output questions
- Q2. Find k largest element in an array
- Ans.
Use sorting or heap data structure to find k largest elements in an array of strings.
Sort the array in descending order and return the first k elements.
Use a max heap data structure to efficiently find the k largest elements.
Examples: ['apple', 'banana', 'orange', 'kiwi'], k=2 -> ['orange', 'kiwi']
(2 Questions)
- Q1. Remove duplicates from array
- Ans.
Remove duplicates from array of strings
Create a Set to store unique strings
Iterate through the array and add each string to the Set
Convert the Set back to an array to get the unique strings
- Q2. Output related questions on student class object
Interview Preparation Tips
Skills evaluated in this interview
I applied via Campus Placement
Test Duration : 90 mins
Platform : Hackerearth
Number of Questions : 10 ( 5 MCQs + 3 Coding questions + 2 SQL Questions)
Questions were of Easy to Medium Level
(4 Questions)
- Q1. Explain your Projects in brief with their functionality and Technology Stack ?
- Ans.
Developed a web application for project management using React, Node.js, and MongoDB.
Created a user-friendly interface for project tracking and collaboration
Implemented authentication and authorization features for secure access
Utilized React for front-end development, Node.js for back-end, and MongoDB for database management
- Q2. Cycle Detection in Linked List and another question on one of its variation.
- Q3. Few Questions on Joins, Normalization and SQL were asked.
- Q4. Few Questions on Java, Object Oriented Programming and 3-4 Output based questions were also asked.
Interview Preparation Tips
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