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Infosys Software Engineer -Application Programming Interview Questions and Answers
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Software Engineer -Application Programming Interview Questions & Answers
Anonymous
posted on 5 Sep 2022
I was interviewed in Aug 2022.
(3 Questions)
- Q1. Walk me through your resume
- Ans. Well, as you can see from my resume
- Q2. Why do you want to work at this company?
- Ans. I saw on the muse that you were also hiring for new positions on the west coast to support your new operations there.
- Q3. Tell me about your self.
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Interview questions from similar companies
Selected
I was interviewed in Dec 2024.
(22 Questions)
- Q1. API Gateway implementation
- Ans.
API Gateway implementation is a centralized service that routes, manages, and secures API calls.
API Gateway acts as a single entry point for all API calls
It can handle authentication, rate limiting, caching, and request/response transformations
Examples include AWS API Gateway, Apigee, Kong
- Q2. Circuit breaker implementation
- Ans.
Circuit breaker is a design pattern used to prevent system overload by temporarily stopping requests to a failing service.
Circuit breaker monitors requests to a service and opens when the service fails repeatedly.
It helps prevent cascading failures and allows the system to gracefully degrade.
Once the circuit breaker is open, it can periodically check if the service has recovered before allowing requests again.
- Q3. What is deadlock? How to avoid it?
- Ans.
Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.
Avoid circular wait by ensuring processes request resources in the same order.
Prevent hold and wait by requiring processes to request all needed resources at once.
Implement a timeout mechanism to break potential deadlocks.
Use resource allocation graphs to detect and prevent deadlocks.
...
- Q4. Explain equals() method
- Ans.
The equals() method is used to compare the contents of two objects for equality.
The equals() method is a method of the Object class in Java.
It is used to compare the contents of two objects for equality.
The default implementation of equals() in the Object class compares memory addresses, so it is often overridden in custom classes to compare content.
Example: String class overrides equals() method to compare the content
- Q5. How mongodb was integrated in your application?
- Ans.
MongoDB was integrated in the application by using the official Java driver and configuring connection settings.
Used the official MongoDB Java driver to interact with the database
Configured connection settings such as host, port, database name, and authentication credentials
Implemented CRUD operations using MongoDB Java driver methods
Utilized MongoDB aggregation framework for complex queries
- Q6. What is hibernate?
- Ans.
Hibernate is an open-source Java framework that simplifies the development of database interactions in Java applications.
Hibernate is an Object-Relational Mapping (ORM) tool that maps Java objects to database tables.
It provides a way to perform database operations using Java objects instead of writing SQL queries.
Hibernate handles the mapping of Java classes to database tables and vice versa, as well as the generation ...
- Q7. Runnable vs Callable interface
- Ans.
Runnable is a functional interface with a single run() method, while Callable is a functional interface with a single call() method.
Runnable is used for tasks that do not return a result, while Callable is used for tasks that return a result.
Callable can throw checked exceptions, while Runnable cannot.
Callable returns a Future object, which can be used to retrieve the result of the computation.
Example: Runnable - execu...
- Q8. Which type of data is returned by Callable interface?
- Ans.
The Callable interface in Java returns a Future object.
Callable interface returns a Future object which represents the result of a computation that may not be available yet.
The Future object can be used to retrieve the result of the computation, check if it is done, or cancel the computation.
Example: Callable<Integer> task = () -> { return 42; }
- Q9. HashMap internal working
- Q10. Concurrent HashMap internal working
- Q11. How to monitor health of your application?
- Ans.
Monitor application health using metrics, logs, alerts, and performance monitoring tools.
Use monitoring tools like Prometheus, Grafana, or New Relic to track key metrics such as CPU usage, memory usage, response times, and error rates.
Implement logging to record important events and errors in your application. Use tools like ELK stack (Elasticsearch, Logstash, Kibana) for log analysis.
Set up alerts to notify you of any...
- Q12. How to call an API in a Microservice architecture?
- Ans.
To call an API in a Microservice architecture, use HTTP requests or messaging protocols like gRPC.
Use HTTP requests to communicate between microservices
Implement RESTful APIs for easy integration
Leverage messaging protocols like gRPC for efficient communication
Consider using service discovery mechanisms for dynamic API calls
- Q13. Explain Profiles
- Ans.
Profiles in Java are configurations that define the capabilities of a Java platform.
Profiles allow developers to target specific types of devices or applications.
They help in reducing the size of the Java runtime environment by including only the necessary APIs.
Examples include Java SE Embedded Profile for embedded devices and Java SE Compact Profile for resource-constrained environments.
- Q14. What is OpenFeign, and how is it used in microservices architecture?
- Ans.
OpenFeign is a declarative web service client used to simplify the process of making HTTP requests in microservices architecture.
OpenFeign allows developers to define RESTful web services as interfaces and automatically generate the necessary implementation code.
It integrates seamlessly with Spring Cloud and other microservices frameworks to facilitate communication between services.
OpenFeign supports features like loa...
- Q15. What is the implementation process for service registry and discovery?
- Ans.
Service registry and discovery involves registering services and allowing clients to discover and connect to them.
Implement a service registry where services can register themselves with metadata
Use a service discovery mechanism for clients to find and connect to services
Implement health checks to ensure services are available and healthy
Use a load balancer to distribute traffic among multiple instances of a service
- Q16. What are Spring boot actuators?
- Ans.
Spring Boot Actuators are built-in tools that provide insight into the running application.
Actuators expose various endpoints to monitor and manage the application.
They can be used to check health, metrics, environment details, and more.
Examples include /actuator/health, /actuator/metrics, and /actuator/env.
- Q17. Synchronous vs Asynchronous communication
- Ans.
Synchronous communication is blocking, while asynchronous communication is non-blocking.
Synchronous communication waits for a response before continuing, while asynchronous communication does not wait.
Examples of synchronous communication include traditional function calls, while examples of asynchronous communication include callbacks and promises.
Synchronous communication can lead to performance issues if there are d...
- Q18. Explain Synchronized keyword
- Ans.
Synchronized keyword is used in Java to control access to shared resources by multiple threads.
Synchronized keyword can be applied to methods or code blocks to ensure only one thread can access the synchronized code at a time.
It prevents race conditions and ensures thread safety by creating a lock on the object or class.
Example: synchronized void myMethod() { // synchronized code block }
- Q19. What are the consequences of excessively using synchronized blocks and methods in Java?
- Ans.
Excessive use of synchronized blocks and methods in Java can lead to performance issues and potential deadlocks.
Decreased performance due to increased contention for locks
Potential deadlocks if multiple threads are waiting for each other to release locks
Increased complexity and difficulty in debugging and maintaining code
Use synchronized sparingly and consider alternatives like ConcurrentHashMap or Lock interface
- Q20. How can you determine the number of threads needed for your application?
- Ans.
The number of threads needed for an application can be determined based on factors like the type of tasks, hardware resources, and performance requirements.
Consider the type of tasks your application needs to perform - CPU-bound tasks may benefit from more threads, while I/O-bound tasks may not.
Take into account the hardware resources available - more threads may be beneficial on a multi-core processor compared to a si...
- Q21. Explain Executor framework
- Ans.
Executor framework is a framework in Java that provides a way to manage and execute tasks asynchronously.
Allows for managing thread execution in a more efficient way
Provides a way to decouple task submission from task execution
Supports various types of executors like ThreadPoolExecutor and ScheduledExecutorService
Helps in handling tasks concurrently and asynchronously
- Q22. Explain BlockingQueue
- Ans.
BlockingQueue is an interface in Java that represents a queue which supports operations that wait for the queue to become non-empty when retrieving an element and wait for space to become available in the queue when adding an element.
BlockingQueue is part of the java.util.concurrent package.
It is used for implementing producer-consumer scenarios where multiple threads are involved.
Methods like put() and take() are used...
(2 Questions)
- Q1. Why did you leave your previous company?
- Ans.
Seeking new challenges and opportunities for growth.
Desire for career advancement
Looking for new challenges
Seeking better work-life balance
Company restructuring or downsizing
Relocation to a new area
- Q2. Other basic questions asked regarding the relevant skills and technologies I have worked with.
Selected
I applied via Approached by Company and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. What improvements to interfaces were introduced in Java 8 that were missing in Java 7, specifically regarding static and default methods?
- Ans.
Java 8 introduced static and default methods in interfaces, allowing for method implementation and code reusability.
Java 8 introduced static methods in interfaces, allowing for method implementation directly in the interface itself.
Default methods were also introduced in Java 8, enabling interfaces to have method implementations without affecting implementing classes.
Static methods in interfaces can be called using the...
- Q2. Explain internal working of HashMap ? How to synchronize it ?
- Ans.
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
HashMap uses an array of linked lists to store key-value pairs.
When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.
If multiple keys hash to the same index, a linked list is used to handle collisions.
To synchronize a HashMap, you can use the synchronizedMap() m...
- Q3. Given a list of employees with their ratings, how can you sort the employees based on their ratings using the Java 8 Streaming API?
- Q4. Will the program compile if the parent class throws a runtime exception while the child class throws an arithmetic exception?
- Ans.
No, the program will not compile if the parent class throws a runtime exception while the child class throws an arithmetic exception.
In Java, if a parent class method throws a checked exception, the child class method can only throw the same exception or its subclasses.
ArithmeticException is an unchecked exception, so if the parent class throws a checked exception and the child class throws an unchecked exception, the ...
- Q5. In a Spring Boot application with two databases, how can you configure JDBC to specify which database to use?
- Ans.
Configure JDBC in Spring Boot to specify which database to use
Define multiple DataSource beans in the configuration class
Use @Primary annotation to specify the primary DataSource
Use @Qualifier annotation to specify the secondary DataSource
Inject the DataSource beans where needed in the application
- Q6. How to use a jetty server in your spring boot application ?
- Ans.
To use a Jetty server in a Spring Boot application, you can configure it as a dependency and customize its settings.
Add Jetty server dependency in your pom.xml file
Exclude Tomcat server dependency if it's included by default in Spring Boot
Configure Jetty server settings in application.properties or application.yml file
Example: Add Jetty dependency - <dependency> <groupId>org.springframework.boot</groupId...
- Q7. Difference between @RequestParam and @PathVariable ?
- Ans.
RequestParam is used to extract query parameters from the URL, while PathVariable is used to extract values from the URI path.
RequestParam is used for query parameters in the URL, while PathVariable is used for values in the URI path.
RequestParam is optional, while PathVariable is required.
RequestParam is used with the @RequestParam annotation, while PathVariable is used with the @PathVariable annotation.
Example: @Requ...
- Q8. How would you handle a scenario where one microservice is awaiting a response from another microservice that is taking an extended time to respond?
- Ans.
I would implement timeout mechanisms and retries to handle the scenario of one microservice awaiting a response from another microservice taking an extended time.
Implement timeout mechanisms in the calling microservice to limit the waiting time for a response.
Set up retry logic to automatically resend the request to the slow microservice if no response is received within the specified timeout period.
Use circuit breaker...
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Selected
I applied via Company Website and was interviewed in Dec 2024. There were 5 interview rounds.
An aptitude test is an assessment to measure a candidate mental aptitude/mental ability
(3 Questions)
- Q1. Can you briefly Tell us 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
- Q2. What do you consider to be your strongest points?
- Ans.
My strongest points include problem-solving skills, attention to detail, and ability to work well in a team.
Strong problem-solving skills - I enjoy tackling complex issues and finding creative solutions.
Attention to detail - I am meticulous in my work and strive for perfection in every task.
Team player - I collaborate effectively with colleagues, communicate openly, and contribute positively to group projects.
- Q3. Which programming languages do you use regularly in your work
- Ans.
I regularly use Java, Python, and SQL in my work as a Software Developer.
Java
Python
SQL
A group discussion is a structured conversation in which participants share their ideas, perspectives, and solutions on a specific topic.
(2 Questions)
- Q1. What motivates you to seek employment at Wipro?
- Ans.
I am motivated to seek employment at Wipro because of their reputation for innovation and opportunities for growth.
Impressed by Wipro's track record of delivering cutting-edge solutions
Excited about the chance to work with a diverse and talented team
Eager to take advantage of Wipro's professional development programs
- Q2. What are your long-term career goals?
- Ans.
My long-term career goal is to become a lead software developer and eventually move into a management role.
Advance to a lead software developer position
Gain experience in managing a team of developers
Develop strong leadership and communication skills
Continue learning new technologies and staying updated with industry trends
Assignment details refer to the specifics of an assignment, including any documents and/or emails or subsequent correspondence between the company and the client.
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- Your academic achievement
- Responsibility related to your p
- The way you address mistakes at
Selected
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(6 Questions)
- Q1. Java 8 , java 11 and java 17 features?
- Ans.
Java 8 introduced lambda expressions, Java 11 added local-variable syntax for lambda parameters, and Java 17 included sealed classes and pattern matching.
Java 8 introduced lambda expressions for functional programming.
Java 11 added local-variable syntax for lambda parameters to simplify code.
Java 17 included sealed classes to restrict inheritance and pattern matching for instanceof checks and type casts.
- Q2. Dispatcher servlet, design patterns
- Q3. @SpringbootApplication annotation, actuators
- Q4. String Coding question with java 8 features such as lambda function and stream api
- Q5. Number of words in a string
- Ans.
Count the number of words in a given string.
Split the string by spaces and count the number of resulting elements.
Handle edge cases like multiple spaces or empty strings.
Consider punctuation marks as part of words unless specified otherwise.
- Q6. Microservice design patterns
Ramu
I applied via Walk-in and was interviewed in Aug 2024. There were 3 interview rounds.
(6 Questions)
- Q1. Introduced yourself?
- Ans.
I am a Senior Software Developer with 8 years of experience in full-stack development, specializing in Java and Angular.
8 years of experience in full-stack development
Specialize in Java and Angular
Strong problem-solving skills
Experience with Agile methodologies
Excellent communication and teamwork abilities
- Q2. What is the use of the yield() method in threading?
- Ans.
The yield() method in threading is used to give up the CPU and allow other threads to run.
Allows other threads to run by giving up the CPU temporarily
Useful for preventing one thread from dominating the CPU
Can be used to implement cooperative multitasking
- Q3. What is hash collision and how it can be handled?
- Ans.
Hash collision occurs when two different inputs produce the same hash value. It can be handled by using techniques like chaining or open addressing.
Hash collision is a common issue in hash tables where different keys produce the same hash value.
One way to handle hash collisions is by using chaining, where each bucket in the hash table stores a linked list of key-value pairs with the same hash value.
Another way to handl...
- Q4. What is use of Method reference instead lambada expressions in java 8?
- Ans.
Method references provide a more concise way to refer to methods by name instead of using lambda expressions.
Method references can make code more readable and maintainable by reducing boilerplate code.
They can be used to refer to static methods, instance methods, and constructors.
Example: list.forEach(System.out::println) is equivalent to list.forEach(item -> System.out.println(item)).
- Q5. What is vertical and horizontal scaling in micro services?
- Ans.
Vertical scaling increases the capacity of a single server, while horizontal scaling adds more servers to distribute the load.
Vertical scaling involves increasing the resources of a single server, such as CPU, RAM, or storage.
Horizontal scaling involves adding more servers to distribute the load, often done through containerization or virtualization.
Vertical scaling is limited by the capacity of a single server, while ...
- Q6. Write a java program to make upper case of first letter in the each word in the below String "i am a java programmer"?
- Ans.
Java program to capitalize first letter of each word in a given string
Split the input string by space to get individual words
Iterate through each word and capitalize the first letter
Join the words back together to form the final capitalized string
(4 Questions)
- Q1. How the escalation matrix works in case of production defects?
- Ans.
Escalation matrix defines the process for escalating production defects based on severity and impact.
Escalation matrix typically includes levels of escalation, responsible parties at each level, and criteria for escalating defects.
For example, a Level 1 escalation may involve the development team, while a Level 2 escalation may involve senior management.
Criteria for escalation may include severity of the defect, impact...
- Q2. What is your recent challenging task you have done in current project?
- Ans.
Implemented a real-time data synchronization feature between multiple servers.
Designed a custom protocol for efficient data transfer
Implemented server-side logic to handle data conflicts
Utilized websockets for real-time communication
- Q3. Can you have ability to handle tasks individually?
- Ans.
Yes, I have the ability to handle tasks individually.
I have a proven track record of successfully completing projects on my own.
I am self-motivated and can prioritize tasks effectively.
I have strong problem-solving skills which allow me to tackle challenges independently.
- Q4. Is it okay to give the Deliverables under pressure?
- Ans.
Yes, it is okay to give deliverables under pressure as long as quality is not compromised.
Meeting deadlines is important in software development.
Pressure can sometimes lead to increased focus and productivity.
Communication with stakeholders about realistic timelines is key.
Prioritizing tasks and managing time effectively can help in delivering under pressure.
(4 Questions)
- Q1. Introduce yourself?
- Ans.
I am a Senior Software Developer with 8 years of experience in developing web applications using various technologies.
Experienced in full stack development
Proficient in languages like Java, JavaScript, and Python
Skilled in using frameworks like Spring, React, and Django
Strong understanding of database management systems
Familiar with Agile development methodologies
- Q2. Why your leaving current company?
- Ans.
Seeking new challenges and growth opportunities.
Desire for career advancement
Looking for new challenges
Seeking better work-life balance
Company restructuring or changes in management
- Q3. What is your current CTC and expected CTC?
- Ans.
My current CTC is $100,000 and my expected CTC is $120,000.
Current CTC: $100,000
Expected CTC: $120,000
- Q4. Do you have all the relevant documents of previous companies?
- Ans.
Yes, I have all relevant documents from previous companies.
I have copies of offer letters, employment contracts, and performance reviews.
I also have any relevant certifications or training records.
I can provide references from previous employers if needed.
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Approached by Company and was interviewed in Dec 2024. There was 1 interview round.
(3 Questions)
- Q1. Project based questions
- Q2. Scenario based question (multithreading and caching related scenarios were asked to me)
- Q3. One coding challenge
Interview Preparation Tips
Vivek Vardhan
Selected
I applied via Naukri.com and was interviewed in Nov 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Admin part and mainly LWC development
- Q2. Case study on devlopment part
(1 Question)
- Q1. Last project details and more technical skills and real-time cases
Software Developer Interview Questions & Answers
Tech Mahindra
Shafaque Sheikh
posted on 25 Jan 2025
(2 Questions)
- Q1. Different types of streams based questions
- Q2. Collection , competable future, java 8 features
I applied via Naukri.com and was interviewed in Aug 2024. There was 1 interview round.
(9 Questions)
- Q1. Transactions in springboot
- Ans.
Transactions in Spring Boot manage database operations as a single unit of work to ensure data integrity.
Spring Boot provides support for declarative transaction management using @Transactional annotation.
Transactions can be configured at class or method level.
Transactions can be rolled back in case of exceptions to maintain data consistency.
Example: @Transactional annotation on a service method ensures that all databa...
- Q2. Difference between arraylist and linked list
- Ans.
ArrayList is resizable array implementation, LinkedList is doubly linked list implementation.
ArrayList uses dynamic array to store elements, LinkedList uses doubly linked list.
ArrayList is faster for accessing elements by index, LinkedList is faster for adding/removing elements.
Example: ArrayList
arrList = new ArrayList<>(); LinkedList linkedList = new LinkedList<>();
- Q3. How REST API used
- Ans.
REST API is used to communicate between client and server using HTTP methods like GET, POST, PUT, DELETE.
REST API allows clients to access and manipulate resources on a server using standard HTTP methods.
It uses URLs to identify resources and HTTP methods to perform actions on those resources.
Common HTTP methods used in REST API are GET (retrieve data), POST (create data), PUT (update data), DELETE (remove data).
REST A...
- Q4. Annotations in springboot
- Ans.
Annotations in Spring Boot are used to provide metadata about the application and its components.
Annotations are used to configure Spring Boot applications, define beans, handle requests, etc.
Examples include @SpringBootApplication, @RestController, @Autowired, @RequestMapping, etc.
- Q5. Features of java 8
- Ans.
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods in interfaces.
Lambda expressions allow for more concise code and enable functional programming.
Functional interfaces are interfaces with a single abstract method, used for lambda expressions.
Streams provide a way to work with collections of objects in a functional style.
Default methods in interfaces ...
- Q6. How interface is implemented in java
- Ans.
Interfaces in Java are implemented using the 'implements' keyword, allowing classes to provide specific implementations for methods defined in the interface.
Interfaces in Java define a contract for classes to implement, specifying method signatures without implementations.
A class can implement multiple interfaces by separating them with commas.
Classes implementing an interface must provide concrete implementations for ...
- Q7. How stream API works
- Ans.
Stream API in Java provides a way to process collections of objects in a functional style.
Stream API allows for functional-style operations on collections like map, filter, reduce, etc.
It supports lazy evaluation, meaning operations are only performed when needed.
Streams can be sequential or parallel, depending on the source and operations used.
- Q8. Benefits of springboot over spring
- Ans.
Spring Boot simplifies the setup and development of Spring applications by providing a convention-over-configuration approach.
Spring Boot eliminates the need for XML configuration by using annotations and sensible defaults.
It includes embedded servers like Tomcat, Jetty, or Undertow, making it easy to deploy standalone applications.
Auto-configuration feature reduces the amount of boilerplate code needed to set up a Spr...
- Q9. Difference between throw and throwable
- Ans.
throw is a keyword used to explicitly throw an exception, while Throwable is a class that serves as the base class for all exceptions in Java.
throw is used to throw an exception in a method, while Throwable is the superclass of all exceptions in Java.
throw is followed by an instance of Throwable class or its subclasses, while Throwable is a class that provides common methods for handling exceptions.
Example: throw new N...
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