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Deloitte Java Developer Interview Questions and Answers
20 Interview questions
A singleton class ensures a single instance throughout the application, providing a global point of access to that instance.
Private Constructor: The constructor of the singleton class is made private to prevent instantiation from outside the class.
Static Instance: A static variable holds the single instance of the class, ensuring that it is created only once.
Public Method: A public static method (often named getIn...
The Singleton Pattern ensures a class has only one instance and provides a global point of access to it.
Single Instance: The Singleton Pattern restricts the instantiation of a class to one single instance.
Global Access: It provides a global point of access to that instance, allowing it to be accessed from anywhere in the application.
Lazy Initialization: The instance is created only when it is needed, which can imp...
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
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 throug...
What people are saying about Deloitte
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
A student management system in SpringBoot involves multiple layers like controller, service, repository, and database.
Use SpringBoot for creating RESTful APIs to handle student data
Implement controller layer to handle incoming HTTP requests and route them to appropriate service methods
Service layer contains business logic for managing student data
Repository layer interacts with the database to perform CRUD operati...
HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null keys or values.
HashMap is non-synchronized, meaning it is not thread-safe, while Hashtable is synchronized and thread-safe.
HashMap allows null values and one null key, while Hashtable does not allow null keys or values.
HashMap is generally preferred for non-thread-safe applications, while Hashtable is used i...
Build a basic CRUD REST API endpoint
Create a REST API endpoint for each CRUD operation (Create, Read, Update, Delete)
Use HTTP methods like POST, GET, PUT, DELETE to perform CRUD operations
Implement data validation and error handling for each operation
Utilize a framework like Spring Boot or Express.js to simplify API development
To find the third highest salary in a SQL table, you can use the 'SELECT TOP 1' statement with 'ORDER BY salary DESC OFFSET 2 ROWS FETCH NEXT 1 ROWS ONLY'.
Use the 'SELECT TOP 1' statement to retrieve only one record
Order the records by salary in descending order using 'ORDER BY salary DESC'
Skip the first two highest salaries using 'OFFSET 2 ROWS'
Fetch the next record after skipping the first two using 'FETCH NEXT ...
Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
Throw is used within a method to throw an exception explicitly.
Throws is used in the method signature to declare the exceptions that the method may throw.
Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.
Examp...
Deloitte Java Developer Interview Experiences
23 interviews found
Anonymous
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. How much exp in docker?
- Q2. Do you have exp in Kubernetes?
- Q3. What is OOP?
- Q4. Types of polymorphism
- Q5. Thread in java
- Ans.
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.
- Q6. Knowledge in which spring modules
- Ans.
Familiarity with key Spring modules enhances Java development, enabling robust, scalable applications with ease.
Spring Core: Provides the foundational features of the Spring Framework, including Dependency Injection (DI). Example: @Autowired annotation.
Spring MVC: A web framework for building web applications. Example: Using @Controller and @RequestMapping for handling requests.
Spring Boot: Simplifies the setup and dev...
- Q7. What is spring profile
- Q8. What is @PreAuthorize and @PostAuthorize
Interview Preparation Tips
- Basics in java
- Spring security
- Spring Boot
- Docker
- Cloud Computing
I appeared for an interview in Dec 2024.
(6 Questions)
- Q1. Explain Oops Concept, keywords in java, access specifiers
- Ans.
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
- Q2. Diff between arraylist and linkedlist
- Q3. Diff between set and list
- Ans.
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.
- Q4. Coding reverse a palindrome
- Q5. How to create rest API
- Q6. Java 8 features, write lambda function to add two numbers
- Ans.
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
(2 Questions)
- Q1. Why you want to change?
- Q2. Coding question related to java 8
I applied via Referral and was interviewed in Aug 2024. There were 3 interview rounds.
(3 Questions)
- Q1. Core Java, multithreading and foncurrency
- Q2. Springboot , app
- Q3. Working of hashset
(2 Questions)
- Q1. Project related questions
- Q2. Scenario based questions
(1 Question)
- Q1. Why do want to join Deloitte
- Ans.
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...
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Sep 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Spring security
- Q2. Solid design principles
- Ans.
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...
(2 Questions)
- Q1. How authentication and authorization works in java
- Q2. Design patterns in java
- Ans.
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.
Skills evaluated in this interview
Sushant Khamkar
(1 Question)
- Q1. Oops, Collection, exception handling, java8
I applied via Naukri.com and was interviewed in Oct 2024. There were 2 interview rounds.
(1 Question)
- Q1. Program on sorting
- Ans.
Sorting program to arrange strings in alphabetical order
Use Arrays.sort() method to sort the array of strings
Implement a custom Comparator to sort in a specific order
Consider using Collections.sort() for sorting ArrayList of strings
(1 Question)
- Q1. Multi-threading
Skills evaluated in this interview
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. What is the difference between an abstract class and an interface?
- Ans.
Abstract classes can have both abstract and concrete methods, while interfaces can only have abstract methods (Java 8+ allows default methods).
Abstract Class: Can have instance variables and constructors. Example: 'abstract class Animal { String name; abstract void sound(); }'
Interface: Cannot have instance variables (only static final variables). Example: 'interface Animal { void sound(); }'
Multiple Inheritance: A cla...
- Q2. How is a singleton class created
- Ans.
A singleton class ensures a single instance throughout the application, providing a global point of access to that instance.
Private Constructor: The constructor of the singleton class is made private to prevent instantiation from outside the class.
Static Instance: A static variable holds the single instance of the class, ensuring that it is created only once.
Public Method: A public static method (often named getInstanc...
I applied via Approached by Company and was interviewed in Mar 2024. There were 3 interview rounds.
(1 Question)
- Q1. Regular core java, OOPS, Spring Boot questions. It was like a rapid-fire round.
(3 Questions)
- Q1. Coding question - find repeat elements in an array
- Q2. Project related questions
- Q3. Build a basic CRUD REST API endpoint
(3 Questions)
- Q1. Behavioral questions
- Q2. Technical questions about SpringBoot and microservices
- Q3. SQL question - third highest salary
- Ans.
To find the third highest salary in a SQL table, you can use the 'SELECT TOP 1' statement with 'ORDER BY salary DESC OFFSET 2 ROWS FETCH NEXT 1 ROWS ONLY'.
Use the 'SELECT TOP 1' statement to retrieve only one record
Order the records by salary in descending order using 'ORDER BY salary DESC'
Skip the first two highest salaries using 'OFFSET 2 ROWS'
Fetch the next record after skipping the first two using 'FETCH NEXT 1 ROW...
Skills evaluated in this interview
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. Witre a code for singletone Pattern.
- Ans.
The Singleton Pattern ensures a class has only one instance and provides a global point of access to it.
Single Instance: The Singleton Pattern restricts the instantiation of a class to one single instance.
Global Access: It provides a global point of access to that instance, allowing it to be accessed from anywhere in the application.
Lazy Initialization: The instance is created only when it is needed, which can improve ...
- Q2. What is a functional interface in programming?
- Ans.
A functional interface is an interface with a single abstract method, enabling lambda expressions in Java.
A functional interface can have multiple default or static methods.
It is annotated with @FunctionalInterface for clarity.
Example: Runnable (void run()), Comparator (int compare(T o1, T o2)).
Lambda expressions can be used to implement functional interfaces.
(1 Question)
- Q1. Microservices, Kafka, api gateway
(1 Question)
- Q1. Project explaination, technical questions
Deloitte Interview FAQs
The duration of Deloitte Java Developer interview process can vary, but typically it takes about less than 2 weeks to complete.
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