NEC Java Developer Interview Questions and Answers

Q1. Stream API related questions , methods etc.
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Q2. What is Qualifier and Primary
Ans. 
Qualifier and Primary are annotations used in Spring framework for dependency injection.
• Qualifier annotation is used to specify which bean should be autowired when multiple beans of the same type are present

• Primary annotation is used to specify the primary bean to be autowired when multiple beans of the same type are present

• Qualifier can be used in combination with Autowired annotation to specify the bean name to be in...read more
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Q3. Spring boot annotations
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Q4. Sort Array of 0 and 1
Ans. 
Sort an array of 0s and 1s in linear time complexity.
• Use two pointers approach - one from the start and one from the end.

• Swap 0s to the left and 1s to the right until the pointers meet.

• Time complexity: O(n), Space complexity: O(1).
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Q5. How do you handle code reviews
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I actively participate in code reviews to ensure code quality and learn from others.
• I actively participate in code reviews by providing constructive feedback on others' code.

• I also seek feedback on my own code to improve its quality and learn from others.

• I follow coding standards and best practices during code reviews to maintain consistency and quality.

• I use code review tools like GitHub pull requests or Bitbucket to
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Q1. Tell me about yourself
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Experienced Java Developer with a passion for creating efficient and scalable applications.
• Over 5 years of experience in Java development

• Strong knowledge of object-oriented programming principles

• Proficient in Spring framework and Hibernate

• Experience with RESTful web services and microservices architecture

• Familiar with Agile methodologies and version control systems like Git
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Q2. Explain Spring Boot flow in your project
Ans. 
Spring Boot simplifies the development of Java applications by providing a set of tools and conventions.
• Spring Boot eliminates the need for manual configuration by providing defaults and auto-configuration.

• It includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• Spring Boot starters help in quickly setting up dependencies and configurations.

• Annotations like @SpringBootApplication and @RestContro
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Q3. Explain Spring Security flow in your project
Ans. 
Spring Security is used for authentication and authorization in Java projects.
• Spring Security provides authentication and authorization support out of the box.

• It can be configured using XML or Java configuration.

• It supports various authentication mechanisms like form-based, basic, and OAuth.

• Roles and permissions can be defined using annotations or configuration.

• Example: @EnableWebSecurity annotation enables Spring Secu
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Q4. What is @SpringBootApplication
Ans. 
Annotation used to mark a class as a Spring Boot application
• Main annotation in Spring Boot to indicate the starting point of the application

• Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations

• Used to enable the auto-configuration feature in Spring Boot

• Reduces the need for XML configuration in Spring applications
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Q5. Coding Question - Find frequency of all the all the elements in Given String
Ans. 
Find frequency of all elements in a given string
• Create a HashMap to store the frequency of each element in the string

• Iterate through the string and update the frequency in the HashMap

• Convert the HashMap to an array of strings for the final result
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Q1. Introduce yourself
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I am a Java Developer with 5 years of experience in developing web applications and implementing software solutions.
• 5 years of experience in Java development

• Proficient in developing web applications

• Skilled in implementing software solutions
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Q2. What is Success according to you
Ans. 
Success is achieving personal goals, feeling fulfilled, and making a positive impact on others.
• Success is subjective and can vary from person to person.

• It is not just about achieving wealth or fame, but also about personal growth and happiness.

• Success can be measured by the impact one has on others and the legacy they leave behind.

• Examples of success include reaching career milestones, maintaining healthy relationships...read more
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Q3. What are your strengths and weekness
Ans. 
My strengths include strong problem-solving skills and attention to detail. My weakness is sometimes being too critical of my own work.
• Strength: Strong problem-solving skills - I enjoy tackling complex problems and finding efficient solutions.

• Strength: Attention to detail - I take pride in producing high-quality work and ensuring accuracy.

• Weakness: Being too critical of my own work - I strive for perfection and sometim...read more
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Q4. Tell me about your Family Background
Ans. 
I come from a close-knit family with a strong emphasis on education and hard work.
• Family is supportive and values education

• Parents are both professionals

• Have a sibling who is also in the tech industry
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Q5. How do you solve any problem
Ans. 
I approach problem-solving by breaking down the issue, researching possible solutions, and testing different approaches.
• Identify the problem and gather all relevant information

• Brainstorm potential solutions and evaluate their feasibility

• Implement the chosen solution and test it to ensure it resolves the problem

• Iterate on the solution if needed to improve its effectiveness
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Q1. Spring Security Implementation
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Q2. Api design Implementation
Ans. 
API design implementation involves creating a well-structured and user-friendly interface for interacting with software applications.
• Understand the requirements and use cases for the API

• Design clear and consistent endpoints with proper documentation

• Implement secure authentication and authorization mechanisms

• Follow RESTful principles for creating APIs

• Consider scalability and performance optimizations
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Q3. Stream API coding question
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Q1. Tell me about your project
Ans. 
Developed a web-based inventory management system for a retail company.
• Used Java, Spring Boot, and MySQL for backend development.

• Implemented user authentication and authorization using Spring Security.

• Designed a responsive front-end using HTML, CSS, and JavaScript.

• Integrated barcode scanning functionality for efficient inventory tracking.
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Q2. Class vs object
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A class is a blueprint or template for creating objects, while an object is an instance of a class.
• A class defines the properties and behaviors of objects, while an object is a specific instance of a class.

• Classes can be used to create multiple objects with similar characteristics.

• Objects have state (attributes) and behavior (methods) defined by the class.

• Example: Class 'Car' defines properties like 'color' and 'model'...read more
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Q1. Salary expectation
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Q2. Date to join?
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It was of 1 hour 30 mins.

Tell me about music.

Q1. Tell me about yourself.
Ans. 
I am a Java Developer with 5 years of experience in developing web applications and software solutions.
• Experienced in Java programming language

• Proficient in developing web applications

• Skilled in software solution development
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Q2. What is class in java.
Ans. 
A class in Java is a blueprint for creating objects, defining attributes and behaviors.
• Classes are used to create objects in Java.

• They define attributes (fields) and behaviors (methods) of the objects.

• Classes can be instantiated to create multiple objects of the same type.

• Example: class Car { String color; void drive() { ... } }

• Example: Car myCar = new Car();
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Q1. What is Springboot
Ans. 
Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.
• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows developers to quickly set up and run standalone Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes convention o...read more
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Q2. Questions on kafka
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Q1. Core java concepts and logical
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Q2. For experience candidate focus on real time projects
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