Augusta Hitech Soft Solution Blockchain Developer Interview Questions and Answers

There was Aptitude, Technical and Coding. Coding there were 4 sections for 4 languages (C, C++, java, Python) We had to do atleast 2. Technical MCQs were based on OS, CN, DSA, C, C++, Python (Numpy, Panda) and Java

Q1. Mainly asked OS, and since I'm from EEE dept, i wasnt well versed in CN, so no CN questions were asked to me. My primary coding language was Python, so some questions regarding the python was asked. I was ...read more
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Collection , logical

Q1. Opps ,spring boot
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Q2. Explain opps concept, what is spring boot
Ans. 
OOPs concept is a programming paradigm based on the concept of objects, Spring Boot is a framework for building Java applications.
• OOPs concept stands for Object-Oriented Programming, which focuses on creating objects that interact with each other to solve problems.

• It involves concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Spring Boot is a framework that simplifies the development of Java applic...read more
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Q3. What is controller and rest controller
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Controller is a class that handles user requests and returns appropriate response. Rest controller is a specialized controller for RESTful web services.
• Controller is a class in MVC architecture that handles user requests and interacts with the model and view.

• Rest controller is a specialized controller in Spring framework for building RESTful web services.

• Rest controller uses annotations like @RestController and @Reques...read more
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Q4. 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 find 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 allows null keys and values, but only one null ...read more
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Q5. Who is best jdbc or hibernate
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Q1. 1. How microservices communicate with each other?
Ans. 
Microservices communicate with each other through APIs and messaging protocols.
• Microservices use APIs to communicate with each other.

• Messaging protocols like HTTP, AMQP, and MQTT are used for asynchronous communication.

• Service discovery mechanisms like Eureka and Consul are used to locate services.

• API gateways like Zuul and Kong are used to manage API traffic.

• Event-driven architecture is used for real-time communicatio
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Q2. 2. How do you secure your APIs?
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Securing APIs involves implementing authentication, authorization, encryption, and input validation.
• Implement authentication mechanisms like OAuth, JWT, or API keys

• Use authorization to control access to APIs based on user roles and permissions

• Encrypt sensitive data transmitted over the network using HTTPS

• Validate and sanitize input to prevent common security vulnerabilities like SQL injection or cross-site scripting (X
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Q3. 3. Scenario based question on qualifier?
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Q4. 4. What is ORM tool?
Ans. 
ORM (Object-Relational Mapping) tool is a software framework that maps objects to relational databases.
• ORM tool simplifies database operations by allowing developers to interact with databases using object-oriented programming.

• It eliminates the need for writing complex SQL queries by providing a higher-level abstraction.

• ORM tools handle tasks like data persistence, retrieval, and mapping between objects and database ta...read more
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Q5. 5. Advantages of hibernate
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Hibernate simplifies database programming in Java applications.
• Hibernate provides a simple and efficient way to interact with databases.

• It eliminates the need for writing complex SQL queries.

• It supports object-oriented programming and mapping of Java classes to database tables.

• It provides caching and lazy loading mechanisms for improved performance.

• It supports transaction management and reduces the risk of data corrupt...read more
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Q6. 6. Rest controller vs Controller
Ans. 
Rest controller is used for RESTful web services while Controller is used for traditional web applications.
• Rest controller maps HTTP requests to RESTful web services while Controller maps HTTP requests to traditional web applications.

• Rest controller uses @RestController annotation while Controller uses @Controller annotation.

• Rest controller returns data in JSON or XML format while Controller returns data in HTML format...read more
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Q7. 7. What if i write component in place of service ?
Ans. 
Using component instead of service may cause confusion and errors in the code.
• Components and services are two different concepts in Java development.

• Components are used for UI elements while services are used for business logic.

• Using component instead of service may lead to errors in the code and confusion for other developers.

• For example, if a component is used instead of a service for business logic, it may not have ...read more
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Q8. 8. What is the work of @autowired?
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The @Autowired annotation is used to automatically wire beans by matching the data type of the bean with the data type of the property.
• Used to inject dependencies automatically

• Reduces the need for manual bean configuration

• Can be used with constructors, fields, and methods

• Can be used with @Qualifier to specify which bean to wire
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Q9. 9. What is Eureka server ? Default port
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Eureka server is a service registry that enables microservices to discover and communicate with each other.
• Eureka server is a component of Netflix's OSS suite.

• It allows services to register themselves and discover other services.

• It uses a REST API for communication.

• Default port is 8761.
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Q10. 10. What is circuit breaker? Hystrix
Ans. 
Circuit breaker is a design pattern used to prevent cascading failures in distributed systems. Hystrix is a popular implementation.
• Circuit breaker monitors the availability of a service and trips if the service fails repeatedly.

• It helps to prevent cascading failures by failing fast and providing fallback options.

• Hystrix is a popular implementation of circuit breaker pattern in Java.

• It provides features like request cac
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Q11. 11. What are ternary operators ?
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Ternary operators are conditional operators that evaluate a boolean expression and return one of two values based on the result.
• Ternary operators are written in the form of 'condition ? value1 : value2'

• If the condition is true, the operator returns value1, otherwise it returns value2

• Ternary operators can be used as a shorthand for if-else statements

• Example: int x = (a > b) ? a : b; // assigns the larger value of a and
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Q12. 12. How to write the entity class?
Ans. 
Entity class represents a table in a database and its attributes as fields.
• Define class with @Entity annotation

• Add @Id annotation to primary key field

• Add @Column annotation to map fields to table columns

• Implement getters and setters

• Override equals() and hashCode() methods
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Q13. 13. What is crud vs Jpa ?
Ans. 
CRUD is a basic operation for data manipulation while JPA is a Java specification for ORM.
• CRUD stands for Create, Read, Update, and Delete which are basic operations for data manipulation.

• JPA is a Java specification for Object-Relational Mapping (ORM) which provides a way to map Java objects to relational database tables.

• JPA provides a higher level of abstraction and simplifies the data access layer by providing an API...read more
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Q1. Java8, Spring Boot, Microservices
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Q1. What is checked unchecked exceptions?
Ans. 
Checked exceptions are exceptions that must be declared in a method's signature or handled using try-catch blocks.
• Checked exceptions are checked at compile-time.

• They are typically used for exceptional conditions that can be reasonably recovered from.

• Examples of checked exceptions in Java include IOException, SQLException, and ClassNotFoundException.
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Q2. How to remove duplicated form from array list?
Ans. 
To remove duplicates from an ArrayList of strings, use a HashSet to store unique elements.
• Create a HashSet and add all elements from the ArrayList to it.

• Create a new ArrayList and add all elements from the HashSet to it.

• The new ArrayList will contain only unique elements.
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Q3. How hashset and hashmap work internally?
Ans. 
HashSet and HashMap are both data structures in Java that use hashing to store and retrieve elements.
• HashSet uses HashMap internally to store its elements as keys with a dummy value.

• HashMap uses an array of linked lists called buckets to store key-value pairs.

• Both HashSet and HashMap use the hashCode() method to calculate the hash value of keys.

• HashSet uses the hash value to determine the bucket where an element should...read more
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Q4. Find sum of all odd numbers in a list using stream?
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Using Java stream, find the sum of all odd numbers in a list.
• Use the filter() method to filter out the odd numbers from the list.

• Use the mapToInt() method to convert the filtered numbers to integers.

• Use the sum() method to calculate the sum of the filtered odd numbers.
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Q1. Covered all java concepts
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Q2. Basics of spring boot
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Q1. Stream based questions, sql queries to find correct output
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Q1. Expected salary, basic hr questions, strength and weakness
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Q1. How hashmap works internally?
Ans. 
Hashmap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.
• Hashmap uses a hash function to convert the key into an index in an array.

• Collisions can occur when two keys map to the same index, which is resolved using separate chaining or open addressing.

• Hashmap provides constant time complexity O(1) for insertion, deletion, and retrieval of values.

• Java's Hashmap implementation use...read more
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Q2. Why string is immutable?
Ans. 
String is immutable to ensure thread safety and prevent unintended modification.
• Immutable objects are safer to use in multi-threaded environments as they cannot be changed by other threads.

• String pool is possible because of immutability, which saves memory and improves performance.

• StringBuffer and StringBuilder classes are used for mutable string operations.

• Example: String s = "hello"; s.concat(" world"); // returns a
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