Databricks Software Developer Interview Questions and Answers

Dispose and finalize are methods used for releasing resources in .NET.

• Dispose is used to release unmanaged resources immediately.

• Finalize is used to release managed resources when the garbage collector runs.

• Dispose can be called manually or through the using statement.

• Finalize is called automatically by the garbage collector.

• Dispose is implemented by IDisposable interface.

• Finalize is implemented by Object class.

OOPs concepts are the principles of Object-Oriented Programming that help in designing and implementing software solutions.

• Encapsulation - binding data and functions together

• Inheritance - creating new classes from existing ones

• Polymorphism - ability of objects to take on multiple forms

• Abstraction - hiding implementation details

• Objects - instances of classes that encapsulate data and behavior

Inheritance is a mechanism in OOP where a new class is derived from an existing class.

• It allows for code reusability and promotes a hierarchical structure.

• It can lead to tight coupling and make the code harder to maintain.

• It can also result in the creation of unnecessary classes and increase complexity.

• Example: A Car class can inherit properties and methods from a Vehicle class.

• Example: A Square class can inherit prope

Explicit interface is a way to implement multiple interfaces with same method names.

• Explicit interface is used to avoid naming conflicts when implementing multiple interfaces.

• It is implemented by prefixing the interface name to the method name.

• It is useful when implementing COM interfaces in .NET.

• Example: void IInterface1.Method() and void IInterface2.Method()

Interface defines only method signatures while abstract class can have method implementations.

• Interfaces can be implemented by multiple classes while abstract classes can only be extended by one class.

• Interfaces are used for achieving multiple inheritance in Java while abstract classes are used for single inheritance.

• Interfaces cannot have constructors while abstract classes can have constructors.

• An example of an inter...read more

Startup method in .NET Core is used to configure the application's services and middleware.

• Startup method is defined in Startup.cs file.

• It includes ConfigureServices and Configure methods.

• ConfigureServices is used to add services to the dependency injection container.

• Configure is used to configure the HTTP request pipeline.

• Example: public void ConfigureServices(IServiceCollection services) { services.AddMvc(); }

• Example...read more

HTTP verbs are used to indicate the type of action being performed on a resource.

• HTTP verbs include GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS

• GET is used to retrieve data from a server

• POST is used to submit data to a server

• PUT is used to update an existing resource on a server

• DELETE is used to delete a resource from a server

• PATCH is used to partially update a resource on a server

• HEAD is used to retrieve only the head...read more

Project architecture refers to the overall design and structure of a software project.

• It includes the organization of components and modules

• Defines the relationships between them

• Specifies the technologies and tools used

• Determines the overall performance and scalability

• Examples include MVC, microservices, and client-server architecture

SID stands for Security Identifier. It is a unique identifier assigned to a user, group, or computer account in Windows.

• SID is used to control access to resources in Windows

• It is a string of alphanumeric characters

• SID is generated by the Windows operating system during the creation of an account

• It is used to identify users, groups, and computers in a network

• Example: S-1-5-21-3623811015-3361044348-30300820-1013

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include running multiple downloads simultaneously or updating a GUI while performing a background task

• Synchronization is important to prevent race conditions and ensure thread safety

Java supports multithreading through the java.lang.Thread class and java.util.concurrent package.

• Java threads are created by extending the Thread class or implementing the Runnable interface.

• Threads can be started using the start() method.

• Synchronization can be achieved using synchronized keyword or locks.

• Java provides several classes and interfaces to support concurrent programming such as Executor, ExecutorService, F...read more

Java does not support multiple inheritance, but interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes, but it can implement multiple interfaces.

• Interfaces can inherit from multiple interfaces using the 'extends' keyword.

• For example, interface C can extend interfaces A and B: 'interface C extends A, B {}'

Do-While loop executes the code block once before checking the condition, while loop checks the condition first.

• Do-While loop is used when the code block needs to be executed at least once.

• While loop is used when the code block may not need to be executed at all.

• Do-While loop is less efficient than While loop as it always executes the code block at least once.

• Example of Do-While loop: do { //code block } while (conditi...read more

Join the tables on a common column and display the combined data.

• Identify the common column in both tables

• Use JOIN statement to combine the tables

• Select the columns to display

• Apply any necessary filters or sorting

• Display the data in a table or list format

Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.

• Primary key cannot have null values, while unique key can have one null value.

• A table can have only one primary key, but multiple unique keys.

• Primary key is used as a foreign key in other tables, while unique key is not.

• Example: Employee ID can be a primary key, while email address can be a unique key.