Interview Questions and Answers

Find two indices in an array whose sum is closest to 0.

• Sort the array to simplify the process.

• Use two pointers approach starting from both ends towards the middle.

• Keep track of the closest sum found so far.

I have implemented various design patterns such as Singleton, Factory, Observer, and Strategy.

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

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

• Implemented Observer pattern for event handling and notification

• Utilized Strategy pattern to define a family of algorithms and make them interchangeable

Find the first non-repeating character in a string using Java 8.

• Use Java 8 streams to convert the string to a character array.

• Use Collectors.groupingBy to group the characters by count.

• Filter out characters with count > 1 and find the first character with count 1.

Pod is the smallest deployable unit in Kubernetes, while deployment manages a set of identical pods.

• Pod is a single instance of a running container in Kubernetes

• Deployment manages a set of identical pods, ensuring they are always running and available

• Pods can be created directly, but deployments are typically used for managing pods in production environments

Node.js is a runtime environment that uses event-driven, non-blocking I/O model to handle asynchronous operations.

• Node.js uses event loop to handle asynchronous operations efficiently.

• It allows multiple I/O operations to be processed concurrently without blocking the execution.

• Node.js uses callbacks, promises, and async/await to manage asynchronous code.

• Example: Reading a file asynchronously using fs module in Node.js.

An event loop is a programming construct that waits for and dispatches events or messages in a program.

• Event loop is commonly used in asynchronous programming to handle multiple tasks concurrently.

• It continuously checks for events in a queue and executes them one by one.

• Event loop helps in preventing blocking of the main thread by allowing non-blocking operations to run in the background.

• Example: Node.js uses an event loop to handle asynchronous operations efficiently.

Resilience in microservices refers to the ability of a system to recover from failures and continue functioning.

• Resilience in microservices involves designing systems that can handle failures gracefully without impacting the overall functionality.

• This can be achieved through techniques such as circuit breakers, retries, timeouts, and fallback mechanisms.

• Resilience also includes monitoring and alerting to quickly identify and respond to failures in the system.

• Examples of resil...read more

Yes, programs of Data structures are essential for efficient data management and algorithm development.

• Data structures are used to organize and store data in a way that enables efficient access and modification.

• Programs of Data structures help in developing algorithms that can manipulate data effectively.

• Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.