Open Destinations Java Developer Interview Questions and Answers

Basic Aptitude questions

Code Questions on Arrays,strings collection

Logical reasoning and Aptitude

Functions with Pointers and strings concepts

Q1. Mainly on Pointers and Dynamic Memory Allocation of 2-D Array
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Q2. Structure Padding and Packing
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Online aptitude consists of general aptitude and technical aptitude

Q1. More about java and project review and coding
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Q1. Normal HR questions
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Q1. What is difference between springboot and spring
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Spring is a framework for building Java applications, while Spring Boot is a tool that simplifies the setup and configuration of Spring applications.
• Spring is a comprehensive framework that provides support for various functionalities like dependency injection, aspect-oriented programming, and more.

• Spring Boot is an opinionated tool that simplifies the setup and configuration of Spring applications by providing default...read more
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Q2. Explaing springboot annotation
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Spring Boot annotations are used to simplify the development process by providing shortcuts for common configurations and functionalities.
• Annotations like @SpringBootApplication, @RestController, @Autowired, @ComponentScan are commonly used in Spring Boot applications.

• Annotations help in reducing boilerplate code and configuring various aspects of the application.

• For example, @SpringBootApplication is used to mark the ...read more
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Q3. How do you use JPA in your project write it
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I use JPA in my project by defining entity classes, annotating them with JPA annotations, creating repositories, and using JPQL queries.
• Define entity classes with @Entity annotation

• Annotate fields with @Column, @Id, @GeneratedValue, etc.

• Create repositories by extending JpaRepository interface

• Use JPQL queries for custom database operations
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Q1. How microservices communicate in your project
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Microservices communicate through REST APIs and messaging queues in our project.
• Microservices communicate with each other using REST APIs for synchronous communication.

• Messaging queues like Kafka or RabbitMQ are used for asynchronous communication between microservices.

• Service discovery tools like Eureka or Consul are used to locate and communicate with other microservices.

• Microservices may also use gRPC for communicat
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Q2. Which design pattern used in your last project
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Q1. Asked about all projects
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Q2. Team size and agile methodology
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Q1. Why are you leaving current organization
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Q2. What do you know about Emtec
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Emtec is a global IT consultancy that provides technology solutions and services to help organizations drive digital transformation.
• Provides IT consultancy services

• Specializes in technology solutions

• Helps organizations with digital transformation
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Q1. Explain process for SDE
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The process for Software Development Engineer involves planning, designing, coding, testing, and deploying software solutions.
• Gather requirements from stakeholders

• Create a design based on requirements

• Write code to implement the design

• Test the software for bugs and issues

• Deploy the software for users to use

• Iterate on feedback and make improvements
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Q1. What are oops concepts in java, explain real time scenario
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OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
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SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
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Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
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Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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Q1. Basic java questions
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Q2. Simple code analyze
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Q3. Some questions about architecture
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Q1. List and tuple differences
Ans. 
List is mutable, tuple is immutable in Python.
• Lists are mutable, meaning their elements can be changed after creation.

• Tuples are immutable, meaning their elements cannot be changed after creation.

• Lists are defined using square brackets [], tuples using parentheses ().

• Lists are typically used for collections of similar items, tuples for fixed collections of dissimilar items.
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Q2. Generators in python
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Generators in Python are functions that allow you to iterate over a sequence of items without storing them all in memory at once.
• Generators are created using a function with 'yield' instead of 'return'.

• They are used to generate a sequence of values lazily, one at a time.

• Generators are memory efficient as they do not store all values in memory at once.

• Example: def my_generator(): for i in range(5): yield i

• Example: ...read more
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