Java Collections Interview Questions and Answers 2023

Collections Framework forms the backbone of Java. Therefore, 

 hold immense importance for a career in Java.

, Collections Framework is a unified architecture for representing and manipulating collections, enabling collections to be manipulated independently of implementation details.

1. What is the Collections Framework in Java and its advantages?

The Collections framework is a set of classes and interfaces with defined architecture, where the algorithms or methods are already defined. Programmers just need to use them and there is no need to write code for any of them.

The advantages of Collections Framework in Java are:

Explore-the-Job-Openings-in-APAC.webp

2. Explain the Collections Framework hierarchy in Java.

This is one of the basic questions from 

. Knowledge of the framework hierarchy provides clarity of the interfaces and classes present in it.

Package java.util contains all the classes and interfaces of the collections framework.

Below is the collections framework hierarchy in Java where:

collection-framework-hierarchy-in-java.jpg

3. Name and explain various interfaces of the Collections framework.

The core collection interfaces form the foundation of the collections framework.

Practice-Your-Coding-Skills-Here.webp

1. What is a List interface in Java? Name the classes which implement it.

Classes which extend List interface in Java are:

ArrayList is a class in the java.util package. The built-in array of Java has a fixed size while ArrayList is a dynamic array. Below is the syntax to create a new ArrayList in Java:

Screenshot-2021-01-06-at-5.22.56-PM.png

3. What is the difference between Array and ArrayList?

We cannot change the size of an Array after creation. It is static.

ArrayList is dynamic and its size can be modified later.

An Array is a built-in data structure by Java.

It is a class provided in the Collections Framework.

Accessed by methods provided by Collections Framework.

Supports both primitive data types and objects of classes.

The primitive data types are not supported.

nPrimitive data types are stored in contiguous locations.nIn the case of an array of objects, the reference to objects is stored in contiguous memory locations. However, the objects themselves will be scattered in memory.n

There are no primitive data types. Hence, the reference to objects is stored in contiguous memory locations like arrays.

Does not have methods like remove(), indexOf(), add() etc.

Has more supportive methods like remove(), indexOf(), add() etc.

We use for/for each loop to iterate over the array.

We use an iterator to iterate over the ArrayList.

ArrayList can be single-dimensional containing objects.

Elements are added by assignment(=) operator.

Objects are assigned using the add() method.

1. We can use java.util.Collections.reverse() method to reverse an ArrayList.

Screenshot-2021-01-06-at-5.26.18-PM.png

2. To reverse a LinkedList same code can be used just replace ArrayList definition with  ‘List mylist = new LinkedList();’

3. Array does not have a reverse() method. We can use the same reverse method to reverse an Array.

Screenshot-2021-01-06-at-5.27.38-PM.png

1. What is a Set interface in Java and its various implementations?

The various implementations of Set interface in Java are:

java-set-implementation.png

Example to demonstrate Set declaration and usage:

Screenshot-2021-01-06-at-5.30.42-PM.png

2. What are the differences between Set and Queue in Java?

Frequently Asked Cloud Computing Interview Questions and Answers

Cloud computing is currently one of the hottest fields to build a career for any technical professional. Larger businesses and smaller organizations are all moving towards the cloud. With the massive cloud adoption, there has been a sudden surge in cloud-related jobs, but a dearth of qualified professionals. Hence, it is the right time for you to build a career in this field. We have, therefore, curated a list of frequently asked cloud computing interview questions

Basic Cloud Computing Interview Questions and Answers

 the provision of computing services over the Cloud (via the Internet) for rapid innovation, high resources availability, and cost-effectiveness. The services range from servers, storage, databases, networking, software, analytics, to intelligence. Cloud offers a pay-as-you-go model meaning you pay only for 

cloud-computing-services.png

2. How is the cloud data centre different from a traditional data centre?

On-premise hardware purchase and maintenance

Cost-efficient as you pay for what you use

High cost as you need to buy server and networking hardware

Costly and complex scaling of data centres

Cloud systems can be built quickly; well within a few minutes

Physical infrastructure can take from a few days to a few months to build

3. What is a cloud service and what are its features?

Cloud service is a service or resource available on-demand for users over the internet. Services are designed to provide easy and economical access to 

, infrastructure and resources fully managed by a cloud server.

4. Define the following in terms of cloud computing: elasticity, scalability, reliability, and availability.

5. What are the different cloud architecture phases?

6. Mention the different data types supported by cloud computing

Cloud computing supports different data types, like Boolean, decimal, emails, text, locale, video, number, date, images, and contracts, etc. You can consider each new demand as a new data type. 

7. What is on-demand functionality? How is it provided in the cloud?

On-demand functionality is the ability of the cloud to deliver computing and other services in 

For instance, let’s say you have an on-premise server with 64 GB RAM and 100TB storage. Though you are using only 16 GB RAM and 10TB storage, you need to incur a cost for the entire infrastructure. On the other hand, if it were a cloud server, you are only required to pay for the 16GB RAM and 10TB storage, on-demand. 

Cloud service providers have a control panel that allows them to view active and inactive servers and allocate them as per the demands of the user traffic. 

 and the cloud server allocates resources without any downtime.

8. What are the different types of cloud computing servicing models?

Different types of Cloud Computing Servicing Models

different-types-of-cloud-computing-servicing-models.png

9. What are the different cloud deployment models?

cloud-deployment-structures-diagram.png

10. What are the layers of PaaS Architecture?

11. What are the modes on which software as a service (SaaS) functions?

12. Mention a few platforms for large-scale cloud computing.

MapReduce are two platforms used for large scale computing in the 

13. Mention some optimization strategies in the cloud.

14. What is the role of the performance cloud?

Performance cloud is beneficial when you need to transfer large amounts of data instantly. Usually, researchers and professionals working on 

15. Mention what is Hypervisor in cloud computing and its types?

A hypervisor or a virtual machine manager (VMM) is a type of virtualization software that the cloud server uses to divide and allocate the resources on the cloud hardware. When software provides partitioning, isolation or abstraction, it is known as a virtualization hypervisor. 

It runs directly on the underlying host system and has direct access to hardware resources. 

Examples include Microsoft Hyper-V hypervisor, VMware ESXi, and Citrix Xen Server. 

It runs as an application on the Host system. Examples include VMware Player or Parallels Desktop.

Hypervisor in Cloud Computing and its types

hypervisor-in-cloud-computing-and-its-types.png

16. What do System Integrators do in cloud computing?

A System Integrator is a company or individual which helps in creating computing systems for the clients by bringing together software and hardware components from different vendors. In cloud computing, a 

 creates such cloud services or products thereby helping their client to 

 the hardships of cloud migration. This process is also known as Integration as a Service. 

Currently, many organizations deploy a hybrid cloud model which is complicated to navigate. In such scenarios, cloud system integrators could help by offering easy and quick deployment and self-provisioning.

17. Which security laws would you implement to secure data in a cloud?

Following are the security laws to secure data in the cloud:

18. What are some cloud security measures taken to ensure secure access to data and applications?

19. How do you secure your data transfer from a cloud?

You need to be certain of two things to ensure data is well protected while transporting in a cloud computing environment:

Another way to prevent a data threat during transport is by using a virtual private network (VPN). Essentially, a VPN converts your public network into a private network mimicking a dedicated connection. This is done by using a firewall and encryption mechanism.

Advanced Cloud Computing Interview Questions

20. What is 'Eucalyptus' and its usage in Cloud Computing?

EUCALYPTUS is an acronym for Elastic Utility Computing Architecture for Linking Your Program to Useful Systems. 

It is open-source software that builds private and hybrid clouds compatible with AWS.

Tell me about yourself - Interview Questions

Irrespective of the candidate's experience level, interviewers often use the "Tell me about yourself" question as an icebreaker. The question is an opportunity for the candidates to set the tone for the discussion, accentuate their strong points, and share their career highlights.

However, you may wonder how to answer the question “tell me about yourself” in the best possible way? How to introduce yourself in an interview that impresses the interviewer?

While it may be overwhelming, with thorough homework, you can answer the tell me about yourself interview question like a pro. Read on to discover tips to better introduce yourself in an interview.

1. Why do interviewers ask “tell me about yourself”?

tell me about yourself interview questions

 to create a comfortable atmosphere during the interview and get you talking.

But more than that, your answer helps them understand whether you are a right fit for the company and the role.

 it will show your interview preparedness. It will also help the recruiter to gauge your communication skills, improvisation skills, and proactivity.

2. How to introduce yourself in an interview

While talking about ourselves should be the easiest thing to do, it often becomes the most dreadful and stressful task during job interviews.

to answer tell me about yourself interview question.

 In that case, you have a better chance to share your experiences relevant to the position you have applied for, your hard and soft skills, your interest in this position, and the skills that make you suitable for this role.

While introducing yourself in an interview, some key elements are:

 Keep your answer within 2 minute length.

3. The present-past-future formula to introduce yourself in an interview

The present, past, and future formula is a simple yet effective way to 

 According to this formula, you need to start your story in the present and build it using relevant information from the past. Next, include your plans for the future.

4. How to answer “tell me about yourself” using the present, past, future formula:

Focusing on the present, share your learning habits, e.g. you follow top developers in FAANG companies, read articles on medium.com, etc. Also, mention personal projects relevant to the role.

For the ‘past’ element, think of 2 projects related to the role you are applying: a new project and an inherited project.

Draw similarities between the company mission or vision to your personal brand/culture. E.g., If I were applying to Homage (a healthcare tech start-up), I’d say the tech/product they build benefits my elderly parents who are living in Malaysia.

Remember, it's your story, and no one knows it better than you. It is fine if you want to talk about the past first and the present later. Tweak your answer in the way you feel is right. However, ensure that you know how to answer tell me about yourself interview question in a way that your interest in the company and the position is obvious to the recruiter. Your answer should also make it clear what makes you the right person for the job.

5. Additional tips for introducing yourself in interviews

Below are some additional points that will skilfully help you to introduce yourself in interviews:

1. Customize your answer for the position and the company

As a part of the interview preparation, research the company thoroughly including its market position, mission, vision, and values. Read the job description to identify the nature of the work and essential skills for this role.

 according to the company and job requirements. Make sure you mention the experiences and skills that are crucial for the position you have applied for.

Due to the open-ended nature of the question, you may be tempted to share some interesting personal details. However, refrain from doing so unless you think that it will directly contribute to the role. For example, your love for trekking could be a bonus when interviewing with a travel company. But usually, interviewers want to know your career story when they ask you the question 

 Hence, instead of sharing personal information, make your answer formal and describe the important milestones of your professional journey.

3. Showcase your expertise along with your passion

You must share two to three skills and personality traits that link to exceptional job performance, particularly for this position. For instance, if you are interviewing for a client-facing role, you can give an example of how you used your negotiation skills at work. At the same time, your love for travel and meeting new people is worth mentioning too. If you are still confused about 

how to introduce yourself in an interview,

 then make a list of all your strengths before the interview.

Long, rambling answers are the last thing a hiring manager wants to hear in an interview. There is no point in reciting your entire resume or every minute detail of your life. If they get bored, they will barely listen to what you say afterwards. Experts suggest keeping the answer under 2 minutes. Under 90 seconds is even better.

Therefore, pre-decide the crucial points that you ought to share with the interviewer and leave the rest. Some things to include in your answer are examples to demonstrate your soft and hard skills, some volunteering work, and personal interests that show positive personality traits like discipline, people skills, problem-solving, etc.

6. Tell me about yourself - sample answer

Both, an entry-level job seeker and an experienced candidate must know 

 and structure their answer accordingly. Hence, below are two examples for each of these categories:

1. Tell me about your 'sample answer' for experienced professionals:

"Hi, I'm Emma. I have over 6 years of experience as a Python developer. Currently, I am working as a senior software engineer with FirstBid. As a part of my role, I create dynamic server-side applications for our clients and internal use. I collaborate with front-end developers to integrate user-facing components with back-end elements.: 

I have a Master's in Computer Science from the National University of Singapore.n    I also have sharp logical and critical thinking abilities, apart from solid coding capabilities. I work alongside four more programmers to develop applications using Python. Together we have successfully delivered projects for our high revenue-generating clients. From time to time, I have stepped up to keep the team together when working under tremendous pressure. My managers have also appreciated my display of leadership abilities as a technology leader.

I now want to level up and use all my learning and skills to lead a team rather than being an individual contributor

This team lead position will allow me to use all my skills and capabilities and make this team one of the winning teams in the department.

2. Tell me about yourself 'sample answer' for a fresh graduate job seeker:

If you are a fresh graduate, your answer should focus on your academic achievements, volunteer work, and some hobby or interest that teach important soft skills.

Hi, I am a recent Computer Science graduate. I chose this field of study because I have been fascinated with maths and computers for as long as I remember. The vast number of career opportunities that computer science provides interests me further.: 

Due to my excellent academic record, I landed an internship that I finished last week. I am, therefore, looking for a full-time role currently.

This junior software engineer role will give me a chance to utilise all my learnings and put them to actual work.

7. Prepare beforehand to answer “tell me about yourself”

Follow the points above to practice how to introduce yourself in an interview. Avoid answering in the spur of the moment because you can miss out on important points. Or even worse, share things with the interviewer that you shouldn't.

Before you attend that interview, take a piece of paper, and write down all the highlights of your professional journey. With your points ready, you know how to answer tell me about yourself interview question.

DevOps and Cyber Security Interview Questions

What can you expect during a whiteboard interview?

A survey conducted among 10,000 developers and 4,000 tech recruiters predicted that more than half of recruiters still use whiteboard interviews during the hiring process for developers and tech-related roles. hire tech talents and developers. But before you can get to cracking the whiteboard interview, you must first understand what you might face during a whiteboard interview. This article will give you a thorough understanding of whiteboarding, from its meaning to its best practices.

Whiteboard interviews: Know what they mean

A whiteboard interview is a coding interview that evaluates a candidate's technical and non-technical skills. It is a part of your tech job interview that aims to test your technical foundation skills to become an expert in computer science and assess other skills like logical reasoning, problem-solving, and communication.

Traditionally, whiteboard interviews, as the name implies, consist of a whiteboard on which candidates are tasked with solving a given problem statement on the spot. And while a physical whiteboard is not possible for online interviews, common platforms like Microsoft Teams and Zoom have Whiteboard features in which candidates can demonstrate their thought process and solve the questions asked by interviewers. When a candidate uses a whiteboard to write and explain anything, it helps others assess their way of expressing their thoughts, communicating their problems, and solving them.

This interview is a live assessment of your technical knowledge and your presentation styles and confidence. It might go from one hour to one day. Interviewers ask coding questions on the spot while the whole interviewing team observes your work.

Whiteboard interview is a coding interview

whiteboard-interview-is-a-coding-interview.webp

Research says a developer shortage exists, but another source says it is a perception created by technical hiring managers. As per this source, the rise of algorithm-centric whiteboard interviews is one of the trends behind this perception. It makes the interview challenging for candidates regarding technical knowledge, logic and problem-solving skill testing, and soft skills.

Despite how difficult it is to pass the whiteboard interview, unicorns and FAANG companies (Facebook, Apple, Amazon, Netflix, and Google) still preferred to follow whiteboarding as a critical part of the hiring process.

the coding interview allows tech hiring managers and recruiters to test the candidates' fundamental technical knowledge and evaluate their performance under high pressure

Whiteboarding is essential; every candidate must undergo this process before joining the company. It helps recruiters and interviewers justify their decisions when selecting and rejecting candidates. Rather than arguing that a particular candidate is not well-suited to the company's culture, they can claim "a candidate is unable to write code for sorting and merging a tree."

A successful whiteboarding and hiring process empowers recruiters and interviewers to believe in their abilities when evaluating candidates and their enthusiasm for joining their companies.

Hence, whiteboard interviews are popular for finding the best tech talent.

The key topics and questions for whiteboard interviews

You must be aware that some topics in computer science are always relevant. These topics are necessary for building a solid technical foundation for a successful career in coding and software development. It is well known that algorithms and data structures are primary computer science concepts. Undoubtedly, every developer should be familiar with these concepts, especially if they want to succeed in a whiteboard interview. Interviewers prefer to use such topics during whiteboard interviews.

nnCreate a clone of the graphnCheck whether binary trees are symmetric or notnReverse nodes in a LinkedIn listnn

nnGenerate all unique possible letter racks in scrabble.nYou are given an array with a non-negative integer character. Find the contiguous subarray that comprises the maximum sumnFind out the median of two sorted arraysnHow to reverse two words in a sentencenGiven a string, find out the smallest sequence of identical charactersnn

nnPrint subsets of a list and find its time complexitynLargest rectangle in the histogramnFind out the Kth permutationnMinimum windows substringnn

nnThis is a real problem; you need to develop an application to solve this problem. Design a system architecture or structure of the appropriate system.nn

, as well as the other FAANG companies. To get more examples of coding interview questions, you can read the book 

In a recent conversation with a technical recruiter, it became clear that these topics have remained relevant for decades. These topics help recruiters to evaluate the design and architecture experience of candidates. While they choose topics during whiteboard interviews based on job posts and candidates’ experience.

 The best way to sharpen your coding skills is to discover top interview questions and answers on different programming subjects.

The best practices for acing whiteboard interviews

To crack any interview, you must do a before and during interview preparation. It applies to whiteboard interviews, also. Prepare yourself for both challenges. Here are the best practices to overcome all challenges associated with whiteboard interviews.

Your application has been accepted by your dream company, and you received your interview date. Now, it's your job to start preparing for your most challenging whiteboard interview. Follow the following 5 practices for your preparation:

Standing in front of a group, figuring out a solution, and writing codes on the whiteboard without using any tools is not easy. But you can make it easy by practising on the whiteboard. You must purchase a real whiteboard and start practising on it before the interview. You can also use a virtual whiteboard, but it is good to use the physical whiteboard to practise your communication skills and body language.

See the below image that shows how it is useful for companies and developers!

start-practicing-on-the-whiteboard.webp

Seek help from your friends and college professors to help you conduct a mock-up interview and simulate the situation. Choose those friends who are experts in coding who do not hesitate to give feedback and cross-examine you. That feedback can help you to discover your strengths and weaknesses.

Practice can make anyone an expert in any area. You can practise your coding skills without using tools by solving coding questions daily. Check out your target companies, research them, and compile a list of common whiteboard interview questions. You must also prepare a list of common interview questions to evaluate your behaviours and potential.

You can try out coding platforms and test your technical knowledge. Taking mock interview tests and common coding challenges would help assess your current level of expertise, which areas or subjects you need to work on and which areas you are good at. Reviewing the answers to these coding challenges is one of the best practices you can do to ace whiteboard interviews.

A whiteboarding interview is also a test of your thought process. This refers to the way in which you approach any problem and how you go about solving the problem. This interview also evaluates your ability to be calm and think fast while solving problems. You must train your mind to remain calm even under immense pressure.

 The mockup quiz is another way to know different factors to assess your programming skills.  

You are sitting before the interview panel, including recruiters, consultants, and other tech experts. You must consider some points during the whiteboard interview to reduce its complexity. The following practices can help

David Yang, CEO and co-founder, has designed a method, 

 to ace whiteboard interview. The REACTO approach stands for Repeat, Examples, Approach, Code, Test, Optimization. He explained this approach in his interview. You can watch it 

 to get tips on technology, interview preparation, and trends.

A whiteboard interview allows you to demonstrate your talents and USP on the spot. Connect to 

 and get every preparation material from the same place. Prepare yourself for the whiteboard interview by following all the shared practices.

# What can you expect during a whiteboard interview?

A survey conducted among 10,000 developers and 4,000 tech recruiters predicted that more than half of recruiters still use whiteboard interviews during the hiring process for developers and tech-related roles. hire tech talents and developers. But before you can get to cracking the whiteboard interview, you must first understand what you might face during a whiteboard interview. This article will give you a thorough understanding of whiteboarding, from its meaning to its best practices.

## Whiteboard interviews: Know what they mean

A whiteboard interview is a coding interview that evaluates a candidate's technical and non-technical skills. It is a part of your tech job interview that aims to test your technical foundation skills to become an expert in computer science and assess other skills like logical reasoning, problem-solving, and communication.

Traditionally, whiteboard interviews, as the name implies, consist of a whiteboard on which candidates are tasked with solving a given problem statement on the spot. And while a physical whiteboard is not possible for online interviews, common platforms like Microsoft Teams and Zoom have Whiteboard features in which candidates can demonstrate their thought process and solve the questions asked by interviewers. When a candidate uses a whiteboard to write and explain anything, it helps others assess their way of expressing their thoughts, communicating their problems, and solving them.

This interview is a live assessment of your technical knowledge and your presentation styles and confidence. It might go from one hour to one day. Interviewers ask coding questions on the spot while the whole interviewing team observes your work.

![Whiteboard interview is a coding interview](https://hackertrail.s3.ap-southeast-1.amazonaws.com/wp/archive/whiteboard_interview_is_a_coding_interview_a82e5f71ae.webp)

## Why whiteboard interviews are important

Research says a developer shortage exists, but another source says it is a perception created by technical hiring managers. As per this source, the rise of algorithm-centric whiteboard interviews is one of the trends behind this perception. It makes the interview challenging for candidates regarding technical knowledge, logic and problem-solving skill testing, and soft skills.

Despite how difficult it is to pass the whiteboard interview, unicorns and FAANG companies (Facebook, Apple, Amazon, Netflix, and Google) still preferred to follow whiteboarding as a critical part of the hiring process.

#### Why?

It is quite simply because **the coding interview allows tech hiring managers and recruiters to test the candidates' fundamental technical knowledge and evaluate their performance under high pressure** to solve real problems!

Whiteboarding is essential; every candidate must undergo this process before joining the company. It helps recruiters and interviewers justify their decisions when selecting and rejecting candidates. Rather than arguing that a particular candidate is not well-suited to the company's culture, they can claim "a candidate is unable to write code for sorting and merging a tree."

A successful whiteboarding and hiring process empowers recruiters and interviewers to believe in their abilities when evaluating candidates and their enthusiasm for joining their companies.

Hence, whiteboard interviews are popular for finding the best tech talent.

![Explore the Job Openings in APAC](https://hackertrail.s3.ap-southeast-1.amazonaws.com/Explore_the_Job_Openings_in_APAC_7a80122a9b.webp)

## The key topics and questions for whiteboard interviews

You must be aware that some topics in computer science are always relevant. These topics are necessary for building a solid technical foundation for a successful career in coding and software development. It is well known that algorithms and data structures are primary computer science concepts. Undoubtedly, every developer should be familiar with these concepts, especially if they want to succeed in a whiteboard interview. Interviewers prefer to use such topics during whiteboard interviews.

### Here are three ever-relevant topics

- Arrays (types of array, different operations on array list, Sorting, Searching, Recursion)
- Data structure (LinkedIn list, Tree, Binary search tree, Graph, Heap, Stack, Queue, Hash table)
- Algorithms (Big O notation, Complexities, Dynamic programming)

#### Here are sample questions

#### **Data structure**

**Sample questions: **nnCreate a clone of the graphnCheck whether binary trees are symmetric or notnReverse nodes in a LinkedIn listnn

#### **Array**

**Sample questions: **nnGenerate all unique possible letter racks in scrabble.nYou are given an array with a non-negative integer character. Find the contiguous subarray that comprises the maximum sumnFind out the median of two sorted arraysnHow to reverse two words in a sentencenGiven a string, find out the smallest sequence of identical charactersnn

#### **Algorithms**

**Sample questions: **nnPrint subsets of a list and find its time complexitynLargest rectangle in the histogramnFind out the Kth permutationnMinimum windows substringnn

#### **System designs**

**Sample questions: **nnThis is a real problem; you need to develop an application to solve this problem. Design a system architecture or structure of the appropriate system.nn

All these key topics are popular in [Google Whiteboard Interview](https://www.interviewkickstart.com/interview-questions/solve-most-asked-whiteboard-interview-questions-at-google-2021), as well as the other FAANG companies. To get more examples of coding interview questions, you can read the book [Cracking the Coding Interview: 189 Programming Questions and Answers](https://www.amazon.com/gp/product/0984782850/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0984782850&linkCode=as2&tag=out0b4b-20&linkId=CPE5JO5PB2MAJLZA) by Gayle Laakmann.

In a recent conversation with a technical recruiter, it became clear that these topics have remained relevant for decades. These topics help recruiters to evaluate the design and architecture experience of candidates. While they choose topics during whiteboard interviews based on job posts and candidates' experience.

***HackerTrail Insider Tip:**** The best way to sharpen your coding skills is to discover top interview questions and answers on different programming subjects.*

*For this, click this *[link](https://www.hackertrail.com/talent/frontend/)* and practice your coding knowledge.*

![Test your coding skills here](https://hackertrail.s3.ap-southeast-1.amazonaws.com/Practice_Your_Coding_Skills_Here_48e8ed4396.webp)

## The best practices for acing whiteboard interviews

To crack any interview, you must do a before and during interview preparation. It applies to whiteboard interviews, also. Prepare yourself for both challenges. Here are the best practices to overcome all challenges associated with whiteboard interviews.

### Before the whiteboard Interview

Your application has been accepted by your dream company, and you received your interview date. Now, it's your job to start preparing for your most challenging whiteboard interview. Follow the following 5 practices for your preparation:

### 1. Start practicing on the whiteboard

Standing in front of a group, figuring out a solution, and writing codes on the whiteboard without using any tools is not easy. But you can make it easy by practising on the whiteboard. You must purchase a real whiteboard and start practising on it before the interview. You can also use a virtual whiteboard, but it is good to use the physical whiteboard to practise your communication skills and body language.

See the below image that shows how it is useful for companies and developers!

![Start practicing on the whiteboard](https://hackertrail.s3.ap-southeast-1.amazonaws.com/wp/archive/start_practicing_on_the_whiteboard_c4dfa202f5.webp)

### 2. Create a simulated environment

Seek help from your friends and college professors to help you conduct a mock-up interview and simulate the situation. Choose those friends who are experts in coding who do not hesitate to give feedback and cross-examine you. That feedback can help you to discover your strengths and weaknesses.

### 3. Make a list of questions

Practice can make anyone an expert in any area. You can practise your coding skills without using tools by solving coding questions daily. Check out your target companies, research them, and compile a list of common whiteboard interview questions. You must also prepare a list of common interview questions to evaluate your behaviours and potential.

### 4. Evaluate your tech knowledge

You can try out coding platforms and test your technical knowledge. Taking mock interview tests and common coding challenges would help assess your current level of expertise, which areas or subjects you need to work on and which areas you are good at. Reviewing the answers to these coding challenges is one of the best practices you can do to ace whiteboard interviews.

### 5. Work on your mindset

A whiteboarding interview is also a test of your thought process. This refers to the way in which you approach any problem and how you go about solving the problem. This interview also evaluates your ability to be calm and think fast while solving problems. You must train your mind to remain calm even under immense pressure.

***HackerTrail Insider Tip:**** The mockup quiz is another way to know different factors to assess your programming skills.  *

*You can do this assessment *[here](https://www.hackertrail.com/practice/)* and find out your preparation level*

![Explore the Job Openings in APAC](https://hackertrail.s3.ap-southeast-1.amazonaws.com/Explore_the_Job_Openings_in_APAC_7a80122a9b.webp)

### During the whiteboard interview

You are sitting before the interview panel, including recruiters, consultants, and other tech experts. You must consider some points during the whiteboard interview to reduce its complexity. The following practices can help

- Choose the programming language in which you are comfortable and confident for solving the given problem and writing any code.
- Pay attention to the power of follow-up questions once you understand the problems/questions and related rules. For greater clarity, repeat the questions in your own words and ask your interviewers questions, if necessary.
- Write down your assumptions, verify them, and take time before writing any code on the whiteboard. It would be best if you outlined your solutions pointwise with pseudocode. Documenting everything helps you think clearly and find the solution quickly.
- Once you are done with the solution, review it, and present them appropriately. Explain it step-by-step with proper reasons. For example, it might be possible that you do not remember some syntax; you can ask for help and discuss that "you know logic but not recalling some syntax.". Don't worry about mistakes that might happen while writing codes without using built-in tools. Express your thoughts, solutions, and logic confidently.
- Focus on resolving problems confidently and clearly throughout the interview. If necessary, take a moment, pause, and speak at a moderate pace if you don't know how to answer any follow-up questions; instead of saying, "I don't know," say, "I don't recall its exact answer at this moment."

David Yang, CEO and co-founder, has designed a method, [the REACTO approach](https://www.fullstackacademy.com/blog/whiteboard-coding-interviews-a-6-step-process-to-solve-any-problem) to ace whiteboard interview. The REACTO approach stands for Repeat, Examples, Approach, Code, Test, Optimization. He explained this approach in his interview. You can watch it [here](https://www.youtube.com/watch?v=DIR_rxusO8Q).

*Click *[here](https://www.hackertrail.com/talent/tips/)* to get tips on technology, interview preparation, and trends.*

## Final Thought

A whiteboard interview allows you to demonstrate your talents and USP on the spot. Connect to [our platform](https://www.hackertrail.com/register/) and get every preparation material from the same place. Prepare yourself for the whiteboard interview by following all the shared practices.

#### Backend Technology Interview Questions

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[AWS Lambda Interview Questions](https://www.hackertrail.com/talent/cloud/aws-lambda-interview-questions-answers/) | [Azure Interview Questions](https://www.hackertrail.com/talent/cloud/azure-interview-questions-answers/) | [Cloud Computing Interview Questions](https://www.hackertrail.com/talent/cloud/frequently-asked-cloud-computing-interview-questions/) | [AWS Interview Questions](https://www.hackertrail.com/talent/cloud/aws-interview-questions-and-answers/).

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[Moving from Manual Testing to Automated Testing](https://www.hackertrail.com/talent/qa/moving-from-manual-testing-to-automated-testing/) | [Selenium Interview Questions](https://www.hackertrail.com/talent/qa/selenium-interview-questions/) | [Automation Testing Interview Questions](https://www.hackertrail.com/talent/qa/top-automation-testing-interview-questions/).

#### DevOps and Cyber Security Interview Questions

[DevOps Interview Questions](https://www.hackertrail.com/talent/devops/devops-interview-questions/) | [How to Prevent Cyber Security Attacks](https://www.hackertrail.com/talent/security/how-to-prevent-cyber-security-attacks/) | [Guide to Ethical Hacking](https://www.hackertrail.com/talent/security/a-beginners-guide-to-ethical-hacking/) | [Network Security Interview Questions](https://www.hackertrail.com/talent/security/network-security-interview-questions-answers/).

#### Design Product Interview Questions

[Product Manager Interview Questions](https://www.hackertrail.com/talent/design-product/product-manager-interview-questions-and-answers/) | [UX Designer Interview Questions](https://www.hackertrail.com/talent/design-product/ux-design-interview-questions-answers/).

#### Interview Preparation Tips

[Strength and Weakness Interview Questions](https://www.hackertrail.com/talent/tips/how-to-answer-strength-and-weakness-interview-questions/) | [I Accepted a Job Offer But Got Another Interview](https://www.hackertrail.com/talent/tips/i-accepted-a-job-offer-but-got-another-interview/) | [Preparation Tips For the Virtual Technical Interview](https://www.hackertrail.com/talent/tips/preparation-tips-for-virtual-technical-interviews/) | [7 Tips to Improve Your GitHub Profile to Land a Job](https://www.hackertrail.com/talent/tips/7-tips-to-improve-your-github-to-land-a-job/) | [Software Engineer Career Opportunities in Singapore](https://www.hackertrail.com/talent/tips/software-engineer-career-opportunities-in-singapore/) | [What can you expect during a whiteboard interview](https://www.hackertrail.com/talent/tips/what-can-you-expect-during-a-whiteboard-interview/) | [How To Write A Resignation Letter](https://www.hackertrail.com/talent/tips/how-to-write-a-resignation-letter/) | [Recommendation Letter Templates and Tips](https://www.hackertrail.com/talent/tips/recommendation-letter-templates-and-guide/).

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