Deloitte Java Developer Interview Questions, Process, and Tips

I have 2 years of experience working with Docker in various projects.

• 2 years of experience working with Docker in various projects

• Proficient in creating Docker containers, managing images, and orchestrating containers using Docker Compose

• Familiar with Docker Swarm and Kubernetes for container orchestration

• Experience in troubleshooting Docker-related issues and optimizing container performance

Yes, I have experience in Kubernetes.

• I have worked on deploying and managing applications on Kubernetes clusters.

• I am familiar with creating and managing Kubernetes resources such as pods, deployments, services, and ingresses.

• I have experience in using tools like kubectl and Helm for interacting with Kubernetes clusters.

• I have implemented CI/CD pipelines using Kubernetes for automated deployment and scaling of applicat

OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.

• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Examples of OOP languages include Java, C++, and Python.

Polymorphism in Java refers to the ability of a method to do different things based on the object it is acting upon.

• Types of polymorphism in Java include method overloading and method overriding.

• Method overloading is when multiple methods have the same name but different parameters.

• Method overriding is when a subclass provides a specific implementation of a method that is already defined in its superclass.

Threads in Java allow multiple tasks to run concurrently within a single program.

• Threads are lightweight sub-processes that share the same memory space.

• They are used to improve performance by allowing tasks to run simultaneously.

• Examples include creating a new thread using the Thread class or implementing the Runnable interface.

Spring profile is a way to segregate parts of your application configuration and make it only available in certain environments.

• Spring profiles allow you to define different configurations for different environments such as development, testing, and production.

• You can use @Profile annotation to specify which beans should be loaded based on the active profile.

• Profiles can be activated in various ways such as through app...read more

Annotations used in Spring Security to apply authorization rules before and after a method is called.

• Used in Spring Security to define authorization rules

• @PreAuthorize is used to apply authorization rules before a method is called

• @PostAuthorize is used to apply authorization rules after a method is called

• Both annotations support SpEL expressions for defining rules

OOPs concept in Java includes keywords and access specifiers for defining classes and objects.

• OOPs concept focuses on objects and classes for code organization

• Keywords like 'class', 'extends', 'implements' are used for defining classes and inheritance

• Access specifiers like 'public', 'private', 'protected' control visibility of class members

ArrayList is implemented using a dynamic array while LinkedList is implemented using a doubly linked list.

• ArrayList provides fast random access and slower insertion/deletion, while LinkedList provides fast insertion/deletion and slower random access.

• ArrayList uses more memory as it needs to allocate a fixed-size array, while LinkedList uses more memory for storing references to the next and previous elements.

• Example: A...read more

Set is a collection of unique elements with no specific order, while list is a collection of elements with a specific order and allows duplicates.

• Set does not allow duplicate elements, while list allows duplicates.

• Set does not maintain insertion order, while list maintains insertion order.

• Examples: HashSet is a set implementation, ArrayList is a list implementation.

Reverse a palindrome string using Java

• Create a function to check if a string is a palindrome

• If the string is a palindrome, reverse it using a StringBuilder

• Return the reversed string

To create a REST API, you need to define endpoints, implement CRUD operations, handle HTTP methods, and use frameworks like Spring Boot.

• Define endpoints for different resources (e.g. /users, /products)

• Implement CRUD operations (Create, Read, Update, Delete) for each endpoint

• Handle HTTP methods like GET, POST, PUT, DELETE

• Use frameworks like Spring Boot to simplify API development

Lambda functions in Java 8 allow for concise and functional programming style.

• Use the lambda operator '->' to define the lambda function.

• Specify the parameters and the body of the lambda function.

• Example: (int a, int b) -> a + b

Seeking new challenges and growth opportunities in a dynamic environment.

• Looking for opportunities to expand my skill set and knowledge in Java development.

• Interested in working on innovative projects that push boundaries and require creative problem-solving.

• Seeking a more collaborative and supportive team environment.

• Want to explore new technologies and methodologies in software development.

HashSet is a collection that does not allow duplicate elements and does not guarantee the order of elements.

• HashSet uses a hash table for storage.

• Elements are stored based on their hash code.

• Adding an element to a HashSet returns false if the element is already present.

• Example: HashSet set = new HashSet<>(); set.add("apple");

I want to join Deloitte because of its reputation for innovation, diverse projects, and opportunities for growth.

• Deloitte is known for its innovative projects and cutting-edge technology, which aligns with my passion for staying up-to-date with the latest trends in Java development.

• I am impressed by Deloitte's diverse range of projects and clients, which will provide me with valuable experience and the opportunity to w...read more

Solid design principles are a set of best practices for designing software that is maintainable, scalable, and flexible.

• Single Responsibility Principle - each class should have only one responsibility

• Open/Closed Principle - classes should be open for extension but closed for modification

• Liskov Substitution Principle - objects of a superclass should be replaceable with objects of its subclasses without affecting the pro...read more

Authentication verifies the identity of a user, while authorization determines what actions they are allowed to perform.

• Authentication is the process of verifying the identity of a user, typically through credentials like username and password.

• Authorization determines what actions a user is allowed to perform after they have been authenticated.

• Java provides various authentication mechanisms like Basic Authentication, D...read more

Design patterns in Java are reusable solutions to common problems in software design.

• Design patterns help in creating flexible, maintainable, and scalable code.

• Examples of design patterns in Java include Singleton, Factory, Observer, and Strategy.

• Each design pattern has its own purpose and can be applied in different scenarios.

• Understanding design patterns is essential for Java developers to write efficient code.