Fluper Mean Stack Developer Interview Questions and Answers

Q1. Net core architecture and features
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Q2. API structure and implementation
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Q1. Salary expectation
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Have to solve 2 coding questions on coding platform

Q1. Oops concept in java, its significance
Ans. 
Oops concept in Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation hides the internal state of an object and restricts access to it.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction focuses on the essential characteristics
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Q2. Thread life cycle
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Q3. How microservices communicates
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Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.
• HTTP: RESTful APIs are commonly used for communication between microservices.

• Messaging queues: Services can communicate asynchronously through message brokers like RabbitMQ or Kafka.

• RPC (Remote Procedure Call): Services can directly call each other's functions over the network.
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Q4. Questions about Collection, hashmap
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Q5. Java 8 features, lambda, stream api coding question
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Q1. Project specific questions
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Q2. @autowired, @qualifier, @primary, @transient, @volatile keyword
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Q3. Use of static keyword
Ans. 
The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
• Static variables are shared among all instances of a class

• Static methods can be called without creating an instance of the class

• Static blocks are used to initialize static variables
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Q4. Dynamic method dispatch
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Q5. DB connections flow in spring boot
Ans. 
DB connections flow in Spring Boot involves configuring data source, creating connection pool, and managing transactions.
• Configure data source in application.properties or application.yml

• Use @EnableJpaRepositories to enable JPA repositories

• Create connection pool using HikariCP or Tomcat JDBC

• Manage transactions using @Transactional annotation
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Q6. Rest vs Soap web services
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REST is lightweight, uses standard HTTP methods, and is more flexible. SOAP is more rigid, uses XML, and has built-in security features.
• REST uses standard HTTP methods like GET, POST, PUT, DELETE for communication.

• SOAP uses XML for communication and has built-in security features like WS-Security.

• REST is more lightweight and flexible, making it easier to work with in modern web development.

• SOAP is more rigid and has a ...read more
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30min Pseudo Code,Ratio and Proportion

1 hour Array,HashMap

Q1. Write a program a string is Anagram or not
Ans. 
Program to check if a string is an Anagram or not
• Create a function that takes in two strings as input

• Sort the characters in both strings and compare if they are equal

• Return true if they are anagrams, false otherwise
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Q2. How to connect mongodb with database
Ans. 
To connect MongoDB with a database, you need to use the MongoDB URI and a MongoDB client library.
• Use the MongoDB URI to specify the connection details such as host, port, username, password, and database name

• Install a MongoDB client library like Mongoose for Node.js or pymongo for Python

• Use the client library to establish a connection to the MongoDB database and perform CRUD operations
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Q3. What is event listener
Ans. 
An event listener is a function that waits for a specific event to occur and then triggers a response.
• Event listeners are commonly used in web development to handle user interactions like clicks, keypresses, etc.

• They are attached to specific elements and listen for events to occur on those elements.

• Once the event occurs, the listener executes a callback function to respond to the event.

• Example: Adding a click event lis...read more
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Q4. What is polymorphism
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Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance in object-oriented programming languages like Java allows for polymorphism.
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Q1. How to reverse a string without using extra space
Ans. 
Use two pointers to swap characters in place
• Initialize two pointers, one at the beginning of the string and one at the end

• Swap characters at the two pointers and move them towards each other until they meet or cross

• Repeat the process until the entire string is reversed
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Q2. Find a number that not present in array in O(N) time complexity array contain only 0 to n numbers
Ans. 
Use bitwise XOR operation to find the missing number in O(N) time complexity.
• Iterate through the array and XOR all the elements with their indices and the array length.

• The missing number will be the result of XORing all the elements with their indices and the array length.
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Q3. Why should you join this company
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Q4. How many interview have you give previously and why you get rejected
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Q1. Ask basic questions related to mendix
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Q2. Microflow, nanoflow, association visibility
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Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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