Feuji Intern Interview Questions and Answers for Freshers

Q1. 1. What are the advantages of Microservices?
Ans. 
Microservices offer advantages such as scalability, flexibility, and easier maintenance.
• Scalability: Microservices allow for individual components to be scaled independently, making it easier to handle high traffic.

• Flexibility: Microservices can be developed and deployed independently, allowing for faster development and deployment cycles.

• Easier maintenance: Microservices are smaller and more focused, making it easier ...read more
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Q2. 2. What are the disadvantages?
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Disadvantages of what? Please specify.
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Q3. 3. How hashmap internally works?
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.
• HashMap uses hashing to store and retrieve values quickly

• It uses an array of buckets to store key-value pairs

• The hash code of the key is used to determine the bucket where the key-value pair is stored

• If two keys have the same hash code, they are stored in the same bucket as a linked list

• When retrieving a value, the hash ...read more
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Q4. 4.Linked list Vs Arraylist
Ans. 
Linked list is dynamic and efficient for insertion/deletion, while ArrayList is faster for random access.
• Linked list uses pointers to connect nodes, while ArrayList uses an underlying array.

• Linked list is better for frequent insertion/deletion, while ArrayList is better for frequent random access.

• Linked list has O(1) time complexity for insertion/deletion, while ArrayList has O(n) time complexity.

• Example: Linked list i...read more
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Q5. 5. Write a program to get the middle of the linked list in a single iteration? Ans - Two pointers , slow fast
Ans. 
Program to get the middle of a linked list in a single iteration using two pointers.
• Use two pointers, slow and fast, to traverse the linked list

• Move slow pointer one step at a time and fast pointer two steps at a time

• When fast pointer reaches the end, slow pointer will be at the middle node
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Q6. 6. Stack peek vs Stack pop?
Ans. 
Stack peek returns the top element without removing it, while stack pop removes and returns the top element.
• Stack peek is used to check the top element of the stack without removing it.

• Stack pop is used to remove and return the top element of the stack.

• Both methods operate on the top element of the stack.
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Q7. 7. RequestMapping vs Postmapping?
Ans. 
RequestMapping is used for all HTTP methods while PostMapping is specifically for POST requests.
• RequestMapping is a general-purpose annotation for mapping HTTP requests to handler methods.

• PostMapping is a specialized version of RequestMapping that only maps POST requests.

• RequestMapping can be used for GET, POST, PUT, DELETE, and other HTTP methods.

• PostMapping is useful when you want to handle only POST requests and ign...read more
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Q8. 8. Singleton in java . And how singleton can be broken
Ans. 
Singleton is a design pattern that restricts the instantiation of a class to one object.
• Singleton pattern is used when we need to ensure that only one instance of a class is created and used throughout the application.

• To implement Singleton, we make the constructor private and provide a static method to get the instance of the class.

• Singleton can be broken by using reflection, serialization, and cloning.

• Reflection can ...read more
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Q9. 9. What is @SpringBootApplication?
Ans. 
A convenience annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan.
• Used to bootstrap a Spring Boot application.

• Automatically configures the Spring application based on the dependencies added to the classpath.

• Scans the package and its sub-packages for components and services.

• Example: @SpringBootApplication public class MyApplication { public static void main(String[] args) { SpringApplic
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Q10. 10. RestController vs Controller?
Ans. 
RestController is used for RESTful web services while Controller is used for traditional web applications.
• RestController returns data in JSON or XML format while Controller returns data in HTML format.

• RestController uses @RestController annotation while Controller uses @Controller annotation.

• RestController is used for building RESTful web services while Controller is used for building traditional web applications.

• RestC...read more
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Q11. 11. Why do we need maven clean and install?
Ans. 
Maven clean removes target directory and install compiles and packages the project
• Maven clean removes the target directory and all the compiled classes and resources

• Maven install compiles and packages the project and installs the resulting artifact into the local repository

• Maven clean and install together ensure that the project is built from scratch and all dependencies are resolved

• Useful when there are changes in the
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Q12. 12. How to switch from one branch to other in git?
Ans. 
To switch from one branch to another in git, use the 'git checkout' command.
• Use 'git checkout' followed by the name of the branch you want to switch to.

• Make sure to commit or stash any changes before switching branches.

• Example: 'git checkout new-branch'
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Q1. 1. How do you secure your APIs?
Ans. 
APIs can be secured using various methods such as authentication, encryption, rate limiting, and input validation.
• Implement authentication using OAuth or JWT

• Use HTTPS encryption to protect data in transit

• Implement rate limiting to prevent DDoS attacks

• Validate input data to prevent injection attacks

• Regularly update and patch software to prevent vulnerabilities
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Q2. 2. What is deadlock? How to resolve it?
Ans. 
Deadlock is a situation where two or more threads are blocked and waiting for each other to release resources.
• Deadlock occurs when two or more threads are waiting for each other to release resources.

• It can be resolved by using techniques like resource allocation graph, timeout, and prevention.

• Prevention can be done by avoiding circular wait, hold and wait, and no preemption.

• Example: Thread A holds resource X and waits ...read more
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Q3. 3. What is spring filter ?
Ans. 
Spring filter is an interface used to intercept HTTP requests and responses.
• Spring filter is used to perform tasks such as logging, security, and caching.

• It can be used to modify the request or response before it reaches the controller.

• Examples of Spring filters include CharacterEncodingFilter, CorsFilter, and CsrfFilter.
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Q4. 4. What is future object in java?
Ans. 
A Future object represents the result of an asynchronous computation in Java.
• Future objects are used to retrieve the result of an asynchronous computation when it becomes available.

• They provide a way to check if the computation is complete, cancel the computation, and retrieve the result.

• They are commonly used in multithreaded programming and in Java's Executor framework.

• Example: Future<Integer> future = executor...read more
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Q5. 5. Lifecycle of object in hibernate ?
Ans. 
Hibernate manages object lifecycle through three states: transient, persistent, and detached.
• When an object is created, it is in the transient state.

• When the object is saved using session.save() method, it becomes persistent.

• When the session is closed or the object is explicitly detached using session.evict() method, it becomes detached.

• Detached objects can be re-attached to a new session using session.update() or sess...read more
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Q6. 6. Save vs Persist in hibernate ?
Ans. 
Save() method inserts a new record into the database, while persist() method can also be used to update an existing record.
• save() method is used to insert a new record into the database

• persist() method can also be used to insert a new record, but it can also be used to update an existing record

• save() method returns the generated ID immediately, while persist() method does not

• save() method can be called outside of a tra...read more
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Q7. 7. Merge intervals problem in java
Ans. 
Merge overlapping intervals in Java
• Sort the intervals based on their start time

• Iterate through the intervals and merge overlapping ones

• Use a stack to keep track of merged intervals
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Q8. 8. Scopes of bean ?
Ans. 
Scopes of bean refer to the visibility and lifecycle of a bean in a Spring application.
• There are four scopes of bean in Spring: singleton, prototype, request, and session.

• Singleton scope creates only one instance of a bean and is the default scope.

• Prototype scope creates a new instance of a bean every time it is requested.

• Request scope creates a new instance of a bean for each HTTP request.

• Session scope creates a new i...read more
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2 DSa questions + cs fundamentals mcq

Q1. System design e-commerce
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Q2. SRE fundamentals
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Q1. Managerial round, resume, work experience and stuff
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Verbal reasoning quewstions

Q1. Technical and programming related questions
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Q2. About the resume
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General DS, Algo and Basic CS question.

Q1. General OS, DS and DB question.
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Q2. Gneral programming question.
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Q1. If Flipkart wants to launch a new television set during the big billion days, how many sets should it have in inventory to satisfy the entire demand?
Ans. 
The number of television sets Flipkart should have in inventory to satisfy the entire demand during the big billion days.
• Estimate the demand based on previous sales data and market trends.

• Consider the production capacity and lead time for restocking.

• Factor in potential competition and pricing strategies.

• Use predictive analytics to forecast demand and optimize inventory levels.

• Ensure adequate safety stock to avoid stock
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Q2. How would a company with a lack of knowledge of renewable packaging go about acquiring relevant technology and convincing manufacturers to create a new process?
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Q3. How many potatoes does Lays India procure in 6 months?
Ans. 
Sorry, I do not have access to the procurement data of Lays India.
• No data available

• Cannot answer the question
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Q4. How would you pitch a proposal for a strategic alliance to a company like Amazon?
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Q5. What is your favorite restaurant? Develop a marketing strategy for the same.
Ans. 
My favorite restaurant is a cozy Italian place called La Trattoria.
• Create a social media presence and post mouth-watering pictures of the food

• Offer a loyalty program to encourage repeat customers

• Partner with food bloggers and influencers to promote the restaurant

• Host special events like wine tastings and cooking classes

• Offer delivery and takeout options to reach a wider audience
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Tell me something about yourself.

Walk us through your CV.

How will you encourage people to use paper bags instead of plastic and what will be your strategy to increase the business of paper bags?

How will you strategize to partner with the Indian government on recycling products so that our company is chosen among all the competitors for the project?

1. Search in a row and column wise sorted matrix

Q1. 1. Web Fundamentals
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Q2. 2.Localstorage vs session storage
Ans. 
Localstorage stores data with no expiration date, while session storage stores data for one session only.
• Localstorage data persists even after the browser is closed, while session storage data is cleared when the session ends.

• Localstorage has a larger storage capacity compared to session storage.

• Localstorage data is accessible across different tabs and windows of the same browser, while session storage data is limited ...read more
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Q1. Tell me about a situation where you handled problem/conflict.
Ans. 
Handled conflict by facilitating open communication and finding a mutually beneficial solution.
• Identified the root cause of the conflict

• Encouraged open and honest communication between parties

• Facilitated a discussion to find a compromise

• Ensured all parties were satisfied with the resolution
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