Blackwell's Software Java Engineer Interview Questions and Answers

Q1. Core java basics Hashmap internal working Oops concept Java 8 feature
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Q1. Java & advance java,spring Boot
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I m to get yourlife company to work.
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Q2. Check my skills
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It's like technical round & Hr round , way of language speaking.
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Q3. I ability to doing work hard in this company
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Q4. I'm have read to extra work form this company
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Q5. I hope I think about me good everything it's OK thank you my side.
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Q1. Asked program to return element in a balance array element. Solid design principle Springboot questions
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Q2. Asked grouping by stream program
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Q3. Spring questions
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Q4. How to remove autoconfiguration in springboot
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To remove autoconfiguration in Spring Boot, exclude the specific autoconfiguration class from the application.
• Exclude the autoconfiguration class using @EnableAutoConfiguration annotation with exclude attribute

• Create a configuration class and exclude the specific autoconfiguration class using @EnableAutoConfiguration annotation

• Use application.properties or application.yml to exclude autoconfiguration classes
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Implementation of the Spring security

Q1. What is hashmap
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HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap implements the Map interface in Java

• It allows null keys and values

• Keys in a HashMap must be unique

• Example: HashMap map = new HashMap<>()
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Q2. Internal Working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calc...read more
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Q3. Compare Throw vs Throws
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Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
• Throw is used within a method to throw an exception explicitly.

• Throws is used in the method signature to declare the exceptions that the method may throw.

• Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.

• Example: t...read more
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Q4. Array vs Arraylist
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Arrays are fixed in size, while ArrayLists can dynamically resize. ArrayLists provide more flexibility and functionality.
• Arrays have a fixed size, while ArrayLists can dynamically resize.

• ArrayLists can easily add, remove, or modify elements, while arrays require manual shifting of elements.

• Arrays use [] syntax for declaration and initialization, while ArrayLists use the ArrayList class from the Java Collections framewo
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Q5. Arraylist vs LinkedList/Vector
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ArrayList is resizable array implementation, LinkedList is doubly linked list implementation, Vector is synchronized version of ArrayList.
• ArrayList is faster for accessing elements, LinkedList is faster for adding/removing elements in middle.

• ArrayList uses less memory than LinkedList due to contiguous memory allocation.

• Vector is thread-safe but slower than ArrayList due to synchronization overhead.
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Q6. Write a code for Iterate hashmap using iterator
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Iterate through a hashmap using an iterator in Java
• Create an iterator using the entrySet() method of the hashmap

• Use a while loop to iterate through the hashmap entries

• Access the key and value of each entry using the getKey() and getValue() methods
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Q1. What are the advantages of spring boot
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Spring Boot provides a simplified way to create stand-alone, production-grade Spring-based Applications.
• Rapid application development

• Embedded server for easy deployment

• Auto-configuration for setting up Spring projects quickly

• Microservices support

• Actuator for monitoring and managing applications
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Q2. Java oops concept and sql questions
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Q1. Questions on the current project
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Q2. Microservices architecture in spring microservices
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Microservices architecture in Spring is a way of designing software applications as a collection of loosely coupled services.
• Microservices architecture breaks down a large application into smaller, independent services that can be developed, deployed, and scaled independently.

• Spring Boot and Spring Cloud are commonly used frameworks for building microservices in Java.

• Each microservice typically has its own database and...read more
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For freshers there is online aptitude test.

Coding round is done by interviewers on live screen sharing

Q1. Here they discuss about projects and work in depth.
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Q1. Tell me about yourself? What are your hobbies? If you get chance to work with our company what is your expectations from us?
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Q2. Discuss about policies and work culture
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Q1. Project, rolls and responsibilities
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Q2. Core java questions
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Q3. Java 8 new features and coding questions
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Q4. Spring boot knowledge check
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Q5. Microservices architecture and scenario based questions related to architecture
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Q6. Sql query basic questions
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Q1. Current project rolls and technical stack
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Q2. Microservices related questions, cloud, deployment on cloud.
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Q3. Area of interest for new techniques
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My area of interest for new techniques includes cloud computing, machine learning, and microservices architecture.
• Cloud computing: Interested in exploring AWS, Azure, and Google Cloud Platform for scalable and cost-effective solutions.

• Machine learning: Excited about implementing algorithms for data analysis and predictive modeling.

• Microservices architecture: Looking into breaking down monolithic applications into small...read more
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Q1. It was most lengthy than technical round they asked more about current role and how we handle the any kind of situations in work.
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Q2. Question related to thought process of candidates
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Q3. Assurance and willingness of candidates to join wipro
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Candidates joining Wipro should have a strong assurance and willingness to contribute to the company's success.
• Candidates should demonstrate a clear understanding of Wipro's values and goals.

• They should be enthusiastic about the opportunity to work at Wipro and contribute to its growth.

• Candidates should be committed to their role and show a willingness to learn and adapt to new challenges.

• They should have a positive at...read more
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Q4. Previous employment history and reasons of switching the jobs
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I have worked at multiple companies, gaining valuable experience and skills in Java development.
• Worked at Company A for 2 years, gained experience in developing web applications using Java Spring framework

• Switched to Company B for better growth opportunities and exposure to new technologies like microservices architecture

• Currently looking for a new challenge in a Senior Java Developer role to further enhance my skills
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Q5. Compensation negotiations
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