RS Software Junior Java Developer Interview Questions and Answers

Have to solve 2 coding questions on coding platform

Q1. Oops concept in java, its significance
Ans. 
Oops concept in Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation hides the internal state of an object and restricts access to it.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction focuses on the essential characteristics
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Q2. Thread life cycle
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Q3. How microservices communicates
Ans. 
Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.
• HTTP: RESTful APIs are commonly used for communication between microservices.

• Messaging queues: Services can communicate asynchronously through message brokers like RabbitMQ or Kafka.

• RPC (Remote Procedure Call): Services can directly call each other's functions over the network.
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Q4. Questions about Collection, hashmap
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Q5. Java 8 features, lambda, stream api coding question
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Q1. Project specific questions
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Q2. @autowired, @qualifier, @primary, @transient, @volatile keyword
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Q3. Use of static keyword
Ans. 
The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
• Static variables are shared among all instances of a class

• Static methods can be called without creating an instance of the class

• Static blocks are used to initialize static variables
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Q4. Dynamic method dispatch
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Q5. DB connections flow in spring boot
Ans. 
DB connections flow in Spring Boot involves configuring data source, creating connection pool, and managing transactions.
• Configure data source in application.properties or application.yml

• Use @EnableJpaRepositories to enable JPA repositories

• Create connection pool using HikariCP or Tomcat JDBC

• Manage transactions using @Transactional annotation
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Q6. Rest vs Soap web services
Ans. 
REST is lightweight, uses standard HTTP methods, and is more flexible. SOAP is more rigid, uses XML, and has built-in security features.
• REST uses standard HTTP methods like GET, POST, PUT, DELETE for communication.

• SOAP uses XML for communication and has built-in security features like WS-Security.

• REST is more lightweight and flexible, making it easier to work with in modern web development.

• SOAP is more rigid and has a ...read more
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Q1. What is OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation involves bundling data and methods that operate on the data into a single unit

• Inheritance allows one class to inherit prop...read more
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Q2. What is Encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct access from outside the class.

• Getters and setters are commonly used to access and modify the encapsulated data.

• Example: In a Car class, variables l...read more
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Q3. Define Four pillars
Ans. 
The four pillars of object-oriented programming in Java are abstraction, encapsulation, inheritance, and polymorphism.
• Abstraction: Hides complex implementation details and only shows the necessary features to the outside world.

• Encapsulation: Bundles data and methods that operate on the data into a single unit, preventing direct access from outside the class.

• Inheritance: Allows a class to inherit properties and behavior...read more
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Q1. Spring boot migration
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Q1. Will you be flexible?
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Normal Question Regarding Java oops and collections

Question regarding arrays, Array list and oops