Mobiloitte Technologies BDM Interview Questions and Answers

Q1. Java coding and development
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Q2. Db and development skills
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Q1. OOPS , multi thread, exception
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Q2. Java 8 features
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Moderate round . Easy to clear

Q1. Explain stream api
Ans. 
Stream API is a feature in Java that allows processing collections of objects in a functional style.
• Stream API provides a way to perform operations on a collection of objects in a declarative way.

• It supports functional-style operations like map, filter, reduce, and forEach.

• Streams can be created from various sources like collections, arrays, or I/O channels.

• Stream operations are lazy, meaning they are only executed whe...read more
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Q2. Data base connection in sprinh boot
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Database connection in Spring Boot is configured using application.properties or application.yml file.
• Define database connection properties in application.properties or application.yml file

• Use @EnableJpaRepositories annotation to enable JPA repositories

• Use @Entity annotation to define entity classes

• Use @Autowired annotation to inject the DataSource or EntityManager
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Q1. Why you want to join in mgs
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I want to join MGS because of its reputation for cutting-edge technology and innovative projects.
• Exciting opportunities for growth and learning

• Strong focus on technology and innovation

• Desire to work with talented and passionate individuals

• Alignment with company values and culture
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Q2. Notice period days
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Online aptitude test on basic mcqs

Q1. Core java, springboot, microservices, mysql questions
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Q2. Oops, collections questions
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Q3. Multithreading questions
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Q4. Exception questions
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Q1. What is four pillars of oops concepts
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Encapsulation, Inheritance, Polymorphism, Abstraction
• Encapsulation: Bundling data and methods that operate on the data into a single unit

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features
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Q2. Different between array and collection
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Arrays are fixed in size and store elements of the same data type, while collections are dynamic in size and can store elements of different data types.
• Arrays have a fixed size, while collections can dynamically resize.

• Arrays store elements of the same data type, while collections can store elements of different data types.

• Arrays use indexes to access elements, while collections use iterators or other methods.

• Examples:...read more
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Q1. They asked from from your resume, and you must know java first and last requirements
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Q1. Why strings are immutable
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Strings are immutable to ensure data integrity and security by preventing accidental or intentional modification.
• Immutable strings prevent accidental changes to data

• Enhances security by preventing data tampering

• Allows for efficient memory management
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Q2. Count the number of repeated words from the given string
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Count the number of repeated words in a given string
• Split the string into words using a delimiter like space

• Create a hashmap to store word frequencies

• Iterate through the words and update the hashmap accordingly

• Count the number of words with frequency greater than 1
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Q1. What is difference between controller and rest controller
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Controller is a general term for a component that handles user requests, while a REST controller specifically handles RESTful requests.
• Controller is a general term for a component that handles user requests in a web application

• REST controller specifically handles RESTful requests, following the principles of REST architecture

• REST controller typically returns data in JSON or XML format, while a regular controller may re
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Q2. Coding question to print highest salary of a employee
Ans. 
Print highest salary of an employee using coding
• Create an array of employee salaries

• Sort the array in descending order

• Print the first element of the sorted array as the highest salary
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Q3. Java 8 features
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Q4. What is jwt token
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JWT token is a JSON web token used for securely transmitting information between parties as a compact and self-contained way.
• JWT stands for JSON Web Token

• It consists of three parts: header, payload, and signature

• It is commonly used for authentication and information exchange in web development
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Q5. Microservice how to interact with other microservice
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Microservices interact with each other through APIs, messaging queues, or event-driven architecture.
• Use RESTful APIs for synchronous communication between microservices

• Implement messaging queues like RabbitMQ or Kafka for asynchronous communication

• Leverage event-driven architecture with tools like Apache Kafka or AWS SNS/SQS

• Consider using service mesh like Istio for managing communication between microservices
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