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I was interviewed in Apr 2021.
Round duration - 60 Minutes
Round difficulty - Medium
This round started slow with some basic fundamental questions around OOPS and then paced up higher to some more advanced questions around Java 8 and Java in general.
SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.
S - Single Responsibility Principle: A class should have only one reason to change.
O - Open/Closed Principle: Software entities should be open for extension but closed for modification.
L - Liskov Substitution Principle: Objects of a superclass should be replaceable...
Abstraction in OOP is the concept of hiding complex implementation details and showing only the necessary features of an object.
Abstraction allows developers to focus on what an object does rather than how it does it
It helps in reducing complexity and improving code reusability
Example: In a car object, we only need to know how to drive it (interface) without worrying about the internal engine workings (implementation)
Abstract class can have method implementations, while interface cannot.
Abstract class can have method implementations, while interface cannot
Abstract class can have constructors, while interface cannot
A class can implement multiple interfaces, but can only inherit from one abstract class
A classloader in Java is a part of the Java Runtime Environment that dynamically loads Java classes into the Java Virtual Machine.
Classloaders are responsible for loading classes at runtime based on the fully qualified name of the class.
There are different types of classloaders in Java such as Bootstrap Classloader, Extension Classloader, and Application Classloader.
Classloaders follow a delegation model where a classl...
Java Strings are immutable to ensure data integrity, thread safety, and security.
Immutable strings prevent accidental modification of data.
String pool optimization is possible due to immutability.
Thread safety is ensured as strings cannot be modified concurrently.
Security is enhanced as sensitive information cannot be altered.
Java code is compiled into bytecode which can run on any platform with JVM, making it platform independent. JVM itself is platform dependent as it needs to be installed on each platform to execute the bytecode.
Java code is compiled into bytecode, which is a platform-independent intermediate code
JVM interprets and executes the bytecode on different platforms
JVM needs to be installed on each platform to run Java programs
...
Standard Java pre-defined functional interfaces include Function, Consumer, Predicate, Supplier, etc.
Function: Represents a function that accepts one argument and produces a result. Example: Function<Integer, String>
Consumer: Represents an operation that accepts a single input argument and returns no result. Example: Consumer<String>
Predicate: Represents a predicate (boolean-valued function) of one argument...
Optional class in Java provides a way to handle null values more effectively.
Prevents NullPointerException by explicitly checking for null values
Encourages developers to handle null values properly
Improves code readability and maintainability
Helps avoid unnecessary null checks and nested if statements
Round duration - 60 Minutes
Round difficulty - Medium
This round had questions from Microservices , Spring Boot and Hibernate. The interviewer was quite freindly and also helped
wherever I was stuck.
Spring supports five bean scopes: singleton, prototype, request, session, and application.
Singleton scope: Default scope, only one instance per Spring container
Prototype scope: New instance created each time bean is requested
Request scope: Bean is created once per HTTP request
Session scope: Bean is created once per HTTP session
Application scope: Bean is created once per ServletContext
Autowiring in Spring Boot is a feature that allows Spring to automatically inject dependencies into a Spring bean.
Autowiring eliminates the need for explicit bean wiring in the Spring configuration file.
There are different modes of autowiring in Spring Boot: 'byName', 'byType', 'constructor', 'autodetect', and 'no'.
For example, 'byName' autowiring matches and injects a bean based on the name of the bean property.
The @RestController annotation in Spring Boot is used to define a class as a RESTful controller.
Used to create RESTful web services in Spring Boot
Combines @Controller and @ResponseBody annotations
Eliminates the need to annotate each method with @ResponseBody
The @SpringBootApplication annotation is used to mark a configuration class that declares one or more @Bean methods and also triggers auto-configuration and component scanning.
Marks a class as a Spring Boot application
Enables auto-configuration of the Spring application context
Performs component scanning for Spring components
Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations
setMaxResults() limits the number of results returned by a query, while setFetchSize() determines the number of rows fetched at a time from the database.
setMaxResults() is used to limit the number of results returned by a query.
setFetchSize() determines the number of rows fetched at a time from the database.
setMaxResults() is typically used for pagination purposes, while setFetchSize() can improve performance by reduci...
Hibernate provides several concurrency strategies like optimistic locking, pessimistic locking, and versioning.
Optimistic locking: Allows multiple transactions to read and write to the database without locking the data. It checks for conflicts before committing the transaction.
Pessimistic locking: Locks the data when a transaction reads it, preventing other transactions from accessing it until the lock is released.
Vers...
Microservice Architecture is an architectural style that structures an application as a collection of loosely coupled services.
Microservices are small, independent services that work together to form a complete application.
Each microservice is responsible for a specific business function and can be developed, deployed, and scaled independently.
Communication between microservices is typically done through APIs.
Microserv...
Spring Cloud addresses issues related to microservices architecture and cloud-native applications.
Service discovery and registration
Load balancing
Circuit breakers
Distributed messaging
Configuration management
Fault tolerance
Monitoring and tracing
Round duration - 30 Minutes
Round difficulty - Easy
This was a Technical Cum HR round where I was first asked some basic Java related concepts and then we discussed
about my expectations from the company , learnings and growth in the forthcomig years. I would suggest be honest and
try to communicate your thoughts properly in these type of rounds to maximise your chances of getting selected.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I applied via Recruitment Consultant and was interviewed in Mar 2021. There were 3 interview rounds.
Top trending discussions
I applied via Naukri.com and was interviewed before May 2021. There were 3 interview rounds.
I applied via Company Website and was interviewed before May 2020. There was 1 interview round.
I applied via Job Portal and was interviewed before Apr 2021. There was 1 interview round.
Solid principles are a set of design principles for writing maintainable and scalable code in C#.
Single Responsibility Principle (SRP) - a class should have only one reason to change
Open/Closed Principle (OCP) - a class should be open for extension but closed for modification
Liskov Substitution Principle (LSP) - derived classes should be substitutable for their base classes
Interface Segregation Principle (ISP) - client...
I applied via Naukri.com and was interviewed in Jul 2020. There were 4 interview rounds.
I applied via Campus Placement and was interviewed before May 2021. There were 4 interview rounds.
VERBAL QUANT DI/LR and Picture based test
Fibonacci series can be easily implemented using loops in C++ or C.
Declare variables for first two numbers of the series
Use a loop to calculate and print the next number in the series
Repeat the loop until desired number of terms are printed
I applied via Walk-in and was interviewed in Nov 2020. There were 3 interview rounds.
I applied via Company Website and was interviewed before May 2020. There were 4 interview rounds.
Some of the top questions asked at the Fujitsu Senior Application Developer interview -
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