Databricks Software Engineer Interview Questions and Answers

Q1. What's return statement in java
Ans. 
The return statement in Java is used to explicitly return a value from a method.
• The return statement is followed by the value that is to be returned from the method.

• It can only be used within a method body.

• Once a return statement is executed, the control is transferred back to the caller of the method.
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Q2. What are get set methods
Ans. 
Get set methods are used in object-oriented programming to retrieve and update the values of private variables.
• Get methods are used to retrieve the value of a private variable.

• Set methods are used to update the value of a private variable.

• They are commonly used to ensure data encapsulation and control access to class variables.
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Q3. What is the difference between an interface and an abstract class in Java?
Ans. 
Interface is a contract specifying methods that a class must implement, while abstract class can have both implemented and abstract methods.
• Interface cannot have method implementations, while abstract class can have both implemented and abstract methods.

• A class can implement multiple interfaces but can only extend one abstract class.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have c...read more
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Q4. How do you implement a stack in Java using an array?
Ans. 
Implement a stack in Java using an array
• Create an array to store the elements of the stack

• Keep track of the top of the stack using an index variable

• Implement push() to add elements to the stack

• Implement pop() to remove elements from the stack

• Example: String[] stackArray = new String[10];
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Q5. What is the difference between a HashMap and a TreeMap in Java?
Ans. 
HashMap is unordered and uses hashing to store key-value pairs, while TreeMap is ordered and uses a red-black tree to store key-value pairs.
• HashMap uses hashing to store key-value pairs, allowing for O(1) time complexity for get and put operations.

• TreeMap uses a red-black tree to store key-value pairs, maintaining order based on the keys.

• HashMap does not guarantee any specific order of elements, while TreeMap maintains...read more
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C and Golang related questions, 2 Hours assement, The test involved writing code by hand in paper in the office (Bengaluru)

Q1. Write a go code to remove duplicate elements from a slice.
Ans. 
Go code to remove duplicate elements from a slice of strings
• Use a map to keep track of unique elements

• Iterate over the slice and add elements to the map

• Create a new slice with unique elements from the map
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Q2. Difference between array and slice in Go.
Ans. 
Arrays have fixed length, slices are dynamic and can grow/shrink. Slices are references to arrays.
• Arrays have fixed length, specified at compile time.

• Slices are dynamic, can grow or shrink at runtime.

• Slices are references to arrays, allowing for more flexibility.

• Example: var arr [3]string // array with fixed length of 3

• Example: slice := make([]string, 0) // slice with dynamic length
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Q3. Explain struct and interface
Ans. 
Struct is a user-defined data type that groups related data fields together. Interface defines a set of methods that a type must implement.
• Struct is used to create complex data structures by grouping related data fields together.

• Interface defines a set of methods that a type must implement. It allows for polymorphism in Go.

• Example: type Person struct { Name string; Age int }

• Example: type Shape interface { Area() float6...read more
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Q4. What is containerization.
Ans. 
Containerization is a method of packaging, distributing, and running applications in isolated environments called containers.
• Containers are lightweight, portable, and can run on any platform that supports containerization.

• They include everything needed to run the application, such as code, runtime, system tools, libraries, and settings.

• Popular containerization tools include Docker, Kubernetes, and Podman.

• Containerizati...read more
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Q5. Write a go code to implement struct.
Ans. 
Implementing a struct in Go code
• Define a struct using the 'type' keyword

• Add fields to the struct with their respective data types

• Access struct fields using dot notation
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Q6. Explain goroutine.
Ans. 
Goroutine is a lightweight thread managed by Go runtime, allowing concurrent execution of functions.
• Goroutines are created using the 'go' keyword in Go programming language.

• They are more lightweight than threads and are managed by the Go runtime.

• Goroutines allow for concurrent execution of functions without the need for manual thread management.

• Example: go myFunction()

• Example: go func() { // code here }
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Q7. How do you achieve concurrency in Go?
Ans. 
Concurrency in Go is achieved using goroutines and channels.
• Use goroutines to run functions concurrently

• Communicate between goroutines using channels

• Avoid using shared memory for synchronization
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Q8. What is channel in Go? What are the differences between buffered and unbuffered channel?
Ans. 
A channel in Go is a communication mechanism that allows goroutines to communicate with each other.
• Buffered channels have a specific capacity and can send multiple values without the need for a corresponding receive operation immediately.

• Unbuffered channels have no capacity and require both a send and receive operation to be ready at the same time for communication to occur.
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Q9. What is scaling? Horizontal and vertical scaling.
Ans. 
Scaling refers to the ability of a system to handle increasing amounts of work or its potential to accommodate growth.
• Horizontal scaling involves adding more machines to distribute the load, while vertical scaling involves increasing the resources of a single machine.

• Horizontal scaling is more cost-effective and provides better fault tolerance, but can be more complex to implement.

• Vertical scaling is simpler to impleme...read more
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