Deloitte Consultant Interview Questions, Process, and Tips for Experienced

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise and readable way. For example, (a, b) -> a + b.

• Functional interfaces are interfaces with a single abstract method, such as java.util.function.Function.

• Streams provide a way to work with collections of objects in a functional style. For e...read more

Generics in Java allow for type-safe collections and classes, providing compile-time type checking and reducing the need for casting.

• Generics enable the creation of classes, interfaces, and methods that operate on specified types.

• They provide compile-time type safety, preventing runtime errors due to type mismatches.

• Generics reduce the need for explicit type casting, making code more readable and maintainable.

• Example: ...read more

Classes and annotations used from entity to controller level in a Java application.

• Entity classes represent database tables and are annotated with @Entity.

• Repository classes handle database operations and are annotated with @Repository.

• Service classes contain business logic and are annotated with @Service.

• Controller classes handle HTTP requests and are annotated with @Controller.

Spring Batch is a lightweight, comprehensive batch framework designed for robust, scalable batch processing.

• Spring Batch is used for processing large volumes of data in batch jobs.

• It provides reusable functions for common batch processing scenarios such as reading, processing, and writing data.

• Spring Batch can be implemented to handle complex processing logic, error handling, and transaction management.

• Key features inc...read more

React uses Virtual DOM to efficiently update the actual DOM by comparing the changes and only updating what is necessary.

• React creates a virtual representation of the actual DOM called Virtual DOM.

• When state or props change, React compares the Virtual DOM with the actual DOM to identify the differences.

• React then updates only the necessary parts of the actual DOM, minimizing the number of DOM manipulations.

• This process...read more

I am familiar with design patterns such as Singleton, Factory, Observer, and Strategy.

• Singleton

• Factory

• Observer

• Strategy

I have used design patterns such as Singleton, Factory, and Observer in my projects.

• Implemented Singleton pattern to ensure only one instance of a class exists

• Utilized Factory pattern to create objects without specifying the exact class

• Applied Observer pattern to establish a one-to-many dependency between objects

Threads in programming are lightweight processes that can run concurrently within a program.

• Threads allow for parallel execution of tasks within a program

• Threads share the same memory space, allowing for efficient communication and data sharing

• Examples of using threads include multi-threaded web servers and parallel processing in data analysis

Spring Boot simplifies Spring application development by providing out-of-the-box features and reducing configuration.

• Spring Boot reduces boilerplate code by providing default configurations for various components like embedded servers, logging, and security.

• Spring Boot allows for easier deployment by packaging applications as standalone JAR files with embedded containers.

• Spring Boot provides a range of starter depende...read more