Deloitte Software Developer Interview Questions and Answers

Q1. What is managed code and unmanaged code
Ans. 
Managed code is code that is executed by the Common Language Runtime (CLR) while unmanaged code is code that is executed directly by the operating system.
• Managed code is written in high-level languages like C#, VB.NET, and is compiled to Intermediate Language (IL) which is executed by the CLR.

• Unmanaged code is written in languages like C, C++, and is compiled directly to machine code which is executed by the operating ...read more
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Q2. What are different access modifiers
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Access modifiers in programming define the scope of a class, method, or variable.
• Public - accessible from any other class

• Private - accessible only within the same class

• Protected - accessible within the same package and subclasses

• Default (no modifier) - accessible only within the same package
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Q3. Diff between array and arraylist
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Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array is a fixed-size collection of elements of the same data type.

• ArrayList is a resizable collection that can grow or shrink in size dynamically.

• Arrays can store primitive data types and objects, while ArrayList can only store objects.

• Arrays use square brackets [] for declaration, while ArrayList is a class in Java's collect...read more
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Q4. Diff between string and stringbuilder
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String is immutable, while StringBuilder is mutable and more efficient for concatenating strings.
• String is immutable, meaning once created, it cannot be changed. StringBuilder is mutable and allows for modifications.

• String concatenation in a loop using String can be inefficient due to creating new objects each time. StringBuilder is more efficient for this purpose.

• String has a fixed length, while StringBuilder can dyna...read more
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Q5. Why string is unmutable
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Strings are immutable in order to ensure data integrity and security.
• Immutable strings prevent accidental changes to data

• Enhances security by preventing data tampering

• Allows for efficient memory management
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Q6. What is connection pooling
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Connection pooling is a technique used to manage a pool of database connections to improve performance and efficiency.
• Connection pooling helps reduce the overhead of opening and closing database connections for each request

• It allows multiple clients to reuse a pre-created set of connections to the database

• Connection pooling can help improve the scalability and performance of applications that require frequent database ...read more
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Q7. What is diff between action controller and api action controller
Ans. 
Action controller is for web applications, API action controller is for APIs
• Action controller is used for handling web requests in a traditional web application

• API action controller is used for handling API requests in a RESTful API

• API action controller typically returns JSON responses, while action controller may return HTML responses

• API action controller often has different authentication and authorization mechanisms...read more
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Q8. What are diff design patterns in sql
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Design patterns in SQL are reusable solutions to common problems encountered in database design and development.
• Singleton Pattern: Ensures a class has only one instance and provides a global point of access to it.

• Factory Pattern: Creates objects without specifying the exact class of object that will be created.

• Repository Pattern: Separates the logic that retrieves data from a data source from the business logic that ac...read more
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Q9. Triggers, cursors, stored procedures
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Q10. Repeater controller
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Q11. Commandbuilder vs command
Ans. 
CommandBuilder is a class used to dynamically create SQL commands, while Command is a pre-defined SQL command.
• CommandBuilder is used to construct SQL commands at runtime based on user input or conditions.

• Command is a pre-defined SQL command that is executed as is.

• CommandBuilder is more flexible and allows for dynamic SQL generation.

• Command is static and does not change during runtime.

• Example: CommandBuilder can be used...read more
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Q1. What is MVC and explain its pattern
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MVC is a software design pattern that separates an application into three main components: Model, View, and Controller.
• Model represents the data and business logic of the application

• View is responsible for displaying the data to the user

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly

• MVC helps in achieving separation of concerns, making the code more orga...read more
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Q2. What is routing in MVC and Angular
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Q1. Tell about aws s3, uses, how to copy s3
Ans. 
AWS S3 is a cloud storage service provided by Amazon Web Services for storing and retrieving data.
• AWS S3 is used for storing and retrieving any amount of data at any time.

• It is commonly used for backup and recovery, archiving, data lakes, and big data analytics.

• To copy data in S3, you can use the AWS Management Console, AWS CLI, or AWS SDKs.

• For example, you can use the 'aws s3 cp' command in the AWS CLI to copy files b...read more
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Q2. What is Lambada function, does lambda suitable for long run
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Lambda function is an anonymous function in programming that can be used for short, simple tasks.
• Lambda functions are commonly used in functional programming languages like Python.

• They are often used for tasks that require a quick, one-time function without the need to define a separate function.

• Lambda functions can be used as arguments for higher-order functions like map, filter, and reduce.

• They are not suitable for l...read more
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Q1. Tell me difference between treemap and hashmap
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HashMap is an unordered collection while TreeMap is a sorted collection based on keys.
• HashMap uses hashing to store key-value pairs, while TreeMap uses a red-black tree for sorting keys.

• HashMap allows one null key and multiple null values, while TreeMap does not allow null keys but allows null values.

• HashMap is generally faster for lookups and insertions, while TreeMap is useful when you need to iterate over keys in so...read more
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Q1. Sort array without using sorting logic
Ans. 
Use custom logic to rearrange array elements without traditional sorting algorithms
• Create a custom logic to rearrange the array elements based on specific criteria

• Use loops and conditional statements to compare and swap elements

• Consider using techniques like bubble sort or insertion sort without directly implementing them
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Q1. What are salary expectations
Ans. 
Salary expectations will depend on factors such as experience, location, and company size.
• Consider factors like experience, location, and company size when determining salary expectations

• Research average salaries for Software Developers in your area

• Be prepared to negotiate based on your skills and qualifications
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It was the 1st round embedded with coding questions and pseudocodes.It was very easy to crack the 1st round

2nd round is group discussion.There was a pannel number.He will say one general topic.we want speak about it.But we should speak confidently, with a good communication skills

Q1. Tell me about your self
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Q2. Project regarding questions
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Q1. What is object what is class what is object vs bean
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A class is a blueprint for creating objects; an object is an instance of a class. Beans are reusable software components.
• A class defines properties and methods; for example, a 'Car' class may have properties like 'color' and 'model'.

• An object is an instance of a class; for example, 'myCar' could be an object of the 'Car' class with specific values.

• JavaBeans are classes that follow specific conventions, such as having a...read more
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Q2. How many ways to define bean Springbootapplication annotation
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In Spring Boot, beans can be defined using various annotations to manage application components effectively.
• @Component: Used to define a generic Spring bean. Example: @Component public class MyBean {}

• @Service: A specialization of @Component, used for service layer beans. Example: @Service public class MyService {}

• @Repository: A specialization of @Component, used for data access layer beans. Example: @Repository public ...read more
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