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Litmus7 Systems Consulting Java Developer Interview Questions, Process, and Tips

Updated 30 Jul 2024

Top Litmus7 Systems Consulting Java Developer Interview Questions and Answers

  • Q1. given two integer array. find consecutive sub arrays and return sub array which has sum >6
  • Q2. Write a program with Java 8 to filter the employees based on salary greater than 10,000 from a list of Employee objects.
  • Q3. Explain Security management, how to enable security for APIs.
View all 35 questions

Litmus7 Systems Consulting Java Developer Interview Experiences

4 interviews found

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in Jun 2024. There was 1 interview round.

Round 1 - Technical 

(28 Questions)

  • Q1. Explain Abstraction and Encapsulation
  • Ans. 

    Abstraction focuses on hiding implementation details, while encapsulation bundles data and methods into a single unit.

    • Abstraction allows us to focus on the essential features of an object while hiding unnecessary details.

    • Encapsulation helps in data hiding by restricting access to certain components of an object.

    • Abstraction is achieved through abstract classes and interfaces in Java.

    • Encapsulation is implemented using ac...

  • Answered by AI
  • Q2. Explain the use of Final keyword
  • Ans. 

    Final keyword is used in Java to declare constants, prevent method overriding, and prevent class inheritance.

    • Used to declare constants - value cannot be changed once assigned

    • Prevents method overriding - method cannot be overridden in child classes

    • Prevents class inheritance - class cannot be extended

  • Answered by AI
  • Q3. Difference between == operator and equals method
  • Ans. 

    The == operator compares memory addresses, while the equals method compares the actual content of objects.

    • The == operator checks if two object references point to the same memory address.

    • The equals method checks if two objects have the same content.

    • Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true.

  • Answered by AI
  • Q4. Explain about Hash Table
  • Ans. 

    Hash table is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

    • Hash table uses a hash function to map keys to indexes in an array.

    • It provides constant time complexity O(1) for insertion, deletion, and retrieval operations.

    • Collisions can occur when two keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

  • Answered by AI
  • Q5. What is Synchronized keyword
  • Ans. 

    Synchronized keyword is used in Java to control access to shared resources by multiple threads.

    • Synchronized keyword is used to create a synchronized block of code, ensuring only one thread can access it at a time.

    • It can be applied to methods or code blocks to prevent concurrent access by multiple threads.

    • Example: synchronized void myMethod() { // synchronized code block }

  • Answered by AI
  • Q6. What is the use of volatile keyword
  • Ans. 

    The volatile keyword in Java is used to indicate that a variable's value will be modified by different threads.

    • Ensures visibility of changes to variables across threads

    • Prevents compiler optimizations that could reorder code and affect variable values

    • Useful for variables accessed by multiple threads without synchronization

    • Example: volatile int count = 0;

  • Answered by AI
  • Q7. What are checked and unchecked exceptions
  • Ans. 

    Checked exceptions are checked at compile time, while unchecked exceptions are not.

    • Checked exceptions must be either caught or declared in the method signature using 'throws' keyword

    • Unchecked exceptions do not need to be caught or declared

    • Examples of checked exceptions: IOException, SQLException

    • Examples of unchecked exceptions: NullPointerException, ArrayIndexOutOfBoundsException

  • Answered by AI
  • Q8. Difference between Interface and Abstract class
  • Ans. 

    Interface is a blueprint of a class with only abstract methods, while abstract class can have both abstract and concrete methods.

    • Interface cannot have method implementations, while abstract class can have both abstract and concrete methods.

    • A class can implement multiple interfaces but can only extend one abstract class.

    • Interfaces are used to achieve multiple inheritance in Java, while abstract classes are used to provi...

  • Answered by AI
  • Q9. Explain Dead lock in multi threading
  • Ans. 

    Deadlock in multithreading occurs when two or more threads are waiting for each other to release resources, resulting in a standstill.

    • Deadlock happens when two or more threads are blocked forever, waiting for each other to release resources.

    • Four conditions must hold for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait.

    • Example: Thread 1 holds resource A and waits for resource B, while...

  • Answered by AI
  • Q10. How to achieve thread safety in java
  • Ans. 

    Thread safety in Java can be achieved by using synchronization, locks, volatile keyword, and thread-safe data structures.

    • Use synchronized keyword to create synchronized blocks or methods

    • Use locks from java.util.concurrent.locks package like ReentrantLock

    • Use volatile keyword to ensure visibility of changes across threads

    • Use thread-safe data structures like ConcurrentHashMap, CopyOnWriteArrayList

  • Answered by AI
  • Q11. Difference between PUT and POST method
  • Ans. 

    PUT is used to update or replace an existing resource, while POST is used to create a new resource.

    • PUT is idempotent, meaning multiple identical requests will have the same effect as a single request.

    • POST is not idempotent, meaning multiple identical requests may have different effects.

    • PUT is used to update an existing resource at a specific URI.

    • POST is used to create a new resource under a specific URI.

    • PUT requests ar...

  • Answered by AI
  • Q12. What are Spring Actuator
  • Ans. 

    Spring Actuator is a set of production-ready features to help monitor and manage your application.

    • Provides endpoints to monitor application health, metrics, and other useful information

    • Can be used to check the status of the application, gather metrics, and even perform custom actions

    • Helps in troubleshooting and monitoring the application in production environment

  • Answered by AI
  • Q13. How to deploy a spring boot application
  • Ans. 

    Spring Boot applications can be deployed using various methods such as embedded servers, Docker containers, and cloud platforms.

    • Deploying as a standalone JAR file using embedded servers like Tomcat or Jetty

    • Building a Docker image and running the application in a container

    • Deploying to cloud platforms like AWS, Azure, or Google Cloud Platform

    • Using CI/CD pipelines for automated deployment

  • Answered by AI
  • Q14. Write a program with Java 8 to filter the employees based on salary greater than 10,000 from a list of Employee objects.
  • Ans. 

    Program to filter employees with salary > 10,000 using Java 8.

    • Use Java 8 Stream API to filter employees based on salary.

    • Create a Predicate to check if salary is greater than 10,000.

    • Use filter() method to apply the Predicate on the list of Employee objects.

  • Answered by AI
  • Q15. How to rollback a transaction in spring boot
  • Ans. 

    To rollback a transaction in Spring Boot, use @Transactional annotation and throw an exception

    • Use @Transactional annotation on the method where the transaction needs to be rolled back

    • Throw an exception within the method to trigger the rollback process

    • Spring will automatically rollback the transaction when an exception is thrown

  • Answered by AI
  • Q16. Explain Dependency Injection in spring boot
  • Ans. 

    Dependency Injection is a design pattern in Spring Boot where the dependencies of a class are injected from the outside.

    • In Spring Boot, Dependency Injection is achieved through inversion of control, where the control of creating and managing objects is given to the Spring framework.

    • Dependencies can be injected into a class using constructor injection, setter injection, or field injection.

    • By using Dependency Injection, ...

  • Answered by AI
  • Q17. Different ways of Dependency Injection
  • Ans. 

    Dependency Injection is a design pattern where the dependencies of an object are provided externally rather than created within the object itself.

    • Constructor Injection: Dependencies are provided through the class constructor.

    • Setter Injection: Dependencies are set through setter methods.

    • Interface Injection: Dependencies are injected through an interface.

    • Spring Framework: Uses annotations like @Autowired for Dependency I

  • Answered by AI
  • Q18. Explain Security management, how to enable security for APIs.
  • Ans. 

    Security management involves implementing measures to protect APIs from unauthorized access and ensure data integrity.

    • Implement authentication mechanisms such as OAuth or API keys to control access to APIs

    • Use encryption to secure data transmission between clients and APIs

    • Implement rate limiting to prevent abuse and protect against denial of service attacks

    • Regularly update and patch API security vulnerabilities to stay ...

  • Answered by AI
  • Q19. Explain JWT Tokens
  • Ans. 

    JWT Tokens are a type of token used for authentication and authorization in web applications.

    • JWT stands for JSON Web Token

    • JWT tokens are compact, URL-safe tokens that can be easily transmitted between parties

    • JWT tokens consist of three parts: header, payload, and signature

    • JWT tokens are often used in stateless authentication systems

    • Example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG...

  • Answered by AI
  • Q20. How to write a test case for a private method
  • Ans. 

    Use reflection to access and test private methods

    • Use reflection to access the private method in the test case

    • Set the method accessible using setAccessible(true)

    • Invoke the method with the necessary parameters and assert the expected result

  • Answered by AI
  • Q21. Stages in Jenkins
  • Ans. 

    Stages in Jenkins are the different steps in a Jenkins pipeline that define the actions to be executed.

    • Stages help break down the pipeline into smaller, manageable sections

    • Each stage can have multiple steps to be executed

    • Stages can be sequential or parallel

    • Common stages include build, test, deploy, and notify

  • Answered by AI
  • Q22. Write 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.

    • Provide a public static method to access the instance.

    • Ensure the constructor is private to prevent instantiation from outside the class.

  • Answered by AI
  • Q23. What is memory leaks in java
  • Ans. 

    Memory leaks in Java occur when objects are no longer being used but are still held in memory, leading to inefficient memory usage.

    • Memory leaks can occur when objects are not properly dereferenced or garbage collected.

    • Common causes of memory leaks include circular references, static references, and unclosed resources.

    • Examples of memory leaks include not closing database connections or file streams after use.

  • Answered by AI
  • Q24. Difference between String and String builder
  • Ans. 

    String is immutable, while StringBuilder is mutable and more efficient for concatenating strings.

    • String is immutable, meaning once created, it cannot be changed. StringBuilder is mutable and allows for modifications.

    • String concatenation in Java creates a new String object each time, while StringBuilder modifies the existing object.

    • StringBuilder is more efficient for concatenating multiple strings as it does not create ...

  • Answered by AI
  • Q25. Explain Garbage Collection in java
  • Ans. 

    Garbage collection in Java is the process of automatically reclaiming memory that is no longer in use by the program.

    • Garbage collection is performed by the JVM to free up memory occupied by objects that are no longer referenced by the program.

    • It helps in preventing memory leaks and ensures efficient memory management.

    • Java provides automatic garbage collection, so developers do not have to manually free up memory.

    • Exampl...

  • Answered by AI
  • Q26. Difference between Array and ArrayList.
  • Ans. 

    Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.

    • Array is a fixed-size collection of elements of the same data type.

    • ArrayList is a resizable collection that can store elements of any data type.

    • Arrays require a specified size at the time of declaration, while ArrayList can grow dynamically.

    • Arrays use square brackets [] for declaration, while ArrayList is a class in Java's col...

  • Answered by AI
  • Q27. Design patterns used
  • Ans. 

    Various design patterns like Singleton, Factory, Observer, etc. are used to solve common problems in software development.

    • Singleton pattern ensures a class has only one instance and provides a global point of access to it.

    • Factory pattern creates objects without specifying the exact class of object that will be created.

    • Observer pattern defines a one-to-many dependency between objects so that when one object changes stat...

  • Answered by AI
  • Q28. What is Rest Services
  • Ans. 

    Rest Services are a type of web service that allows communication between different systems over HTTP using standard methods like GET, POST, PUT, DELETE.

    • Rest Services are stateless, meaning each request from a client to the server must contain all the information necessary to understand the request.

    • They use standard HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations on resources.

    • Rest Services typically...

  • Answered by AI

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed in Jun 2024. There were 3 interview rounds.

Round 1 - Technical 

(3 Questions)

  • Q1. Functional interfaces
  • Q2. Multithreading in spring boot
  • Ans. 

    Multithreading in Spring Boot allows for concurrent execution of tasks, improving performance and responsiveness.

    • Spring Boot provides support for multithreading through the use of @Async annotation.

    • By annotating a method with @Async, it will be executed in a separate thread.

    • ThreadPoolTaskExecutor can be configured to control the number of threads used for executing async methods.

    • Example: @Async public void asyncMethod(

  • Answered by AI
  • Q3. Stream api, microservice
Round 2 - Technical 

(3 Questions)

  • Q1. Given two integer array. find consecutive sub arrays and return sub array which has sum >6
  • Ans. 

    Find consecutive subarrays in two integer arrays with sum > 6.

    • Iterate through both arrays to find consecutive subarrays.

    • Calculate the sum of each subarray and check if it is greater than 6.

    • Return the subarray with sum > 6.

  • Answered by AI
  • Q2. Find max element from integer array
  • Ans. 

    Use a loop to iterate through the array and keep track of the maximum element found so far.

    • Initialize a variable to store the maximum element found so far.

    • Iterate through the array and update the maximum element if a larger element is found.

    • Return the maximum element after iterating through the entire array.

  • Answered by AI
  • Q3. Filter a name from string array
  • Ans. 

    Filter a specific name from a string array

    • Iterate through the array and check each element for the desired name

    • Use a conditional statement to filter out the name from the array

    • Consider using Java 8 streams and lambda expressions for a more concise solution

  • Answered by AI
Round 3 - HR 

(1 Question)

  • Q1. Salary package discussion

Interview Preparation Tips

Interview preparation tips for other job seekers - moslty asked about core java concepts. prepare that very well and do practice on stream api.

Skills evaluated in this interview

Java Developer Interview Questions Asked at Other Companies

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Q3. Which should be preferred between String and StringBuffer when th ... read more
asked in Deloitte
Q4. Convert BST to Greater Sum Tree Given a Binary Search Tree (BST) ... read more
Q5. 2. What will happen if hashcode only returns a constant? How will ... read more
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Jun 2024. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. Comparable vs Comparator
  • Ans. 

    Comparable is used to define the natural ordering of objects, while Comparator is used to define custom ordering.

    • Comparable interface is used to compare objects based on their natural ordering. Example: sorting a list of Strings alphabetically.

    • Comparator interface is used to define custom ordering of objects. Example: sorting a list of custom objects based on a specific attribute.

  • Answered by AI
  • Q2. WHat is Executor Service
  • Ans. 

    Executor Service is a framework provided by Java to manage and control the execution of tasks in a multithreaded environment.

    • It provides a way to manage threads and execute tasks asynchronously.

    • It allows for the reuse of threads instead of creating new ones for each task.

    • It can handle task scheduling, thread pooling, and thread lifecycle management.

    • Example: Executors.newFixedThreadPool(5) creates a thread pool with 5 t

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Good knowledge in Core Java , Multithreading concepts, Spring Boot real time projects, Exception Handling in SpringBoot

Skills evaluated in this interview

Java Developer Interview Questions & Answers

user image Liya Thomas

posted on 25 Jun 2024

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Company Website and was interviewed in May 2024. There was 1 interview round.

Round 1 - Technical 

(1 Question)

  • Q1. Java program to find couple sum of two integers in ArrayList will be equal to a integer value .
  • Ans. 

    Java program to find couple sum of two integers in ArrayList equal to a given integer value.

    • Iterate through the ArrayList and check for pairs of integers that sum up to the given value.

    • Use a nested loop to compare each pair of integers in the ArrayList.

    • Store the pairs that satisfy the condition in a separate list or print them directly.

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Java 8 features
Stored procedure
Spring security
Deadlock

Skills evaluated in this interview

Litmus7 Systems Consulting interview questions for designations

 Software Developer

 (1)

 Senior Android Developer

 (1)

 Reactjs Developer

 (1)

 SAP Hybris Developer

 (1)

 QA Engineer

 (1)

 Devops Engineer

 (1)

Interview questions from similar companies

I applied via Company Website and was interviewed before Dec 2020. There were 4 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Questions on Java,SQL,some trending technologies(IOT,Big data),pattern questions, programming questions with different approaches.

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare basics of DSA, have knowledge about the databases, some common dml ,ddl statements, programming knowledge of a particular language like C,Java, python,etc...have good command on oops concepts... little bit of frameworks knowledge will also help

I applied via Newspaper Ad and was interviewed before Jun 2021. There were 3 interview rounds.

Round 1 - Aptitude Test 
Round 2 - Technical 

(1 Question)

  • Q1. Basic questions of java.
Round 3 - HR 

(1 Question)

  • Q1. Intro and other hr related questions.

Interview Preparation Tips

Interview preparation tips for other job seekers - Cover the basic questions regarding the programming language.

I applied via Referral and was interviewed before Apr 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

Puzzles, Psychometric Test

Round 2 - One-on-one 

(1 Question)

  • Q1. Some water in 3 Jars question, you had to measure out 5L correctly

Interview Preparation Tips

Interview preparation tips for other job seekers - Make the interview interactive, I got this input from another Senior. Before i went into the interview room the volunteers were telling all those who goes into Room No 1 is screwed. I was praying i don't get room no 1. But fortunately for me I got room no 1 because when the interviewer gave me the puzzle and handed over pen and paper he went back to relax his posture and when i explained i will fill the 5L Jar first, he immediately came forward to listen to me, at that moment i knew i got the job because i felt the previous candidates never made their interview interactive and that's why he went back to relax his posture.

I applied via Company Website and was interviewed before Jun 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

First round was coding as well as aptitude done together went well I guess focusing on codes helps a lot.

Round 2 - Technical 

(1 Question)

  • Q1. 2nd round included tr and mr round went quite enegritic

Interview Preparation Tips

Interview preparation tips for other job seekers - Resume skills matters a lot don't fill resume the technologies you don't even aware of

I was interviewed before Jun 2016.

Interview Questionnaire 

4 Questions

  • Q1. Tell me something about yourself
  • Ans. 

    I am a passionate software developer with 5 years of experience in web development and a strong background in computer science.

    • 5 years of experience in web development

    • Strong background in computer science

    • Passionate about software development

  • Answered by AI
  • Q2. Questions related to project I have worked on during college days
  • Q3. Core Java concepts
  • Q4. Why do you use two mobile numbers
  • Ans. 

    To separate personal and professional calls, and to ensure availability and accessibility.

    • Separate personal and professional calls

    • Ensure availability and accessibility

    • Maintain work-life balance

    • Avoid mixing personal and work-related contacts

  • Answered by AI

Interview Preparation Tips

Round: Test
Total Questions: 60

College Name: Watumull Institute Of Electronics Engineering And Computer Technology ( WIEECT )

I was interviewed in Sep 2016.

Interview Questionnaire 

3 Questions

  • Q1. Tell me about yourself
  • Ans. 

    I am a passionate software developer with experience in Java, Python, and web development.

    • Experienced in Java, Python, and web development technologies

    • Strong problem-solving skills and ability to work in a team

    • Completed multiple projects including a web-based inventory management system

  • Answered by AI
  • Q2. Simple coding questions..Basically pattern.
  • Q3. And also they will ask about your projects.

Interview Preparation Tips

Round: Test
Experience: 60 multiple choice questions so have to manage time carefully.
Tips: Have to give equal importance to all the sections..So try to do well in all section.
Duration: 1 hour 30 minutes
Total Questions: 60

Round: Technical + HR Interview
Experience: Don't panic...Only write those things that you know in your resume.

Skills: Smart Coding
College Name: Jaypee Institute Of Information Technology, Noida
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Litmus7 Systems Consulting Interview FAQs

How many rounds are there in Litmus7 Systems Consulting Java Developer interview?
Litmus7 Systems Consulting interview process usually has 1-2 rounds. The most common rounds in the Litmus7 Systems Consulting interview process are Technical and HR.
How to prepare for Litmus7 Systems Consulting Java Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Litmus7 Systems Consulting. The most common topics and skills that interviewers at Litmus7 Systems Consulting expect are Java, Spring Boot, Microservices, Multithreading and Rest.
What are the top questions asked in Litmus7 Systems Consulting Java Developer interview?

Some of the top questions asked at the Litmus7 Systems Consulting Java Developer interview -

  1. given two integer array. find consecutive sub arrays and return sub array which...read more
  2. Write a program with Java 8 to filter the employees based on salary greater tha...read more
  3. Explain Security management, how to enable security for AP...read more

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Litmus7 Systems Consulting Java Developer Interview Process

based on 4 interviews

1 Interview rounds

  • Technical Round
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Litmus7 Systems Consulting Java Developer Salary
based on 4 salaries
₹11 L/yr - ₹17 L/yr
124% more than the average Java Developer Salary in India
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