Synechron Senior Software Engineer Interview Questions and Answers

Hooks in React are functions that let you use state and other React features in functional components.

• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that lets you perform side effects in functional components.

• Custom hooks are reusable functions that can contain st...read more

Sample React code for a timer component

• Use useState to store the timer value

• Use useEffect to update the timer every second

• Display the timer value in the component's render method

Factory Method Pattern

• Defines an interface for creating objects, but lets subclasses decide which class to instantiate

• Encapsulates object creation logic to a separate class

• Useful when a class can't anticipate the type of objects it needs to create

• Example: java.util.Calendar.getInstance()

• Example: javax.xml.parsers.DocumentBuilderFactory.newInstance()

Design patterns are reusable solutions to common software problems.

• Creational patterns: Singleton, Factory, Abstract Factory

• Structural patterns: Adapter, Decorator, Facade

• Behavioral patterns: Observer, Strategy, Command

• Architectural patterns: Model-View-Controller, Model-View-ViewModel

• Concurrency patterns: Thread Pool, Producer-Consumer

• Examples: Singleton ensures only one instance of a class exists, Factory create...read more

Partitioning a large database involves dividing the data into smaller chunks to improve performance and manageability.

• Identify key columns for partitioning, such as date ranges or customer IDs.

• Choose a partitioning strategy, such as range partitioning or hash partitioning.

• Implement partitioning using database features like table partitioning in Oracle or partitioned tables in PostgreSQL.

Collection's framework is a set of interfaces and classes that provide high-performance, high-quality implementations of data structures.

• Provides interfaces like List, Set, Map for storing and manipulating collections of objects

• Includes classes like ArrayList, LinkedList, HashSet, HashMap for concrete implementations

• Allows for easy iteration, sorting, searching, and manipulation of collections

• Supports generics to ...read more

Multi threading is a technique to execute multiple threads concurrently in a single process.

• Multi threading improves application performance by utilizing multiple CPU cores.

• It requires careful synchronization to avoid race conditions and deadlocks.

• Java provides built-in support for multi threading through the Thread class and Runnable interface.

• Thread pools can be used to manage and reuse threads efficiently.

• Multi...read more

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

• Data structures can be classified as linear or non-linear

• Examples of linear data structures include arrays, linked lists, and stacks

• Examples of non-linear data structures include trees and graphs

• Data structures can be implemented using various programming languages

• Efficient algorithms for searching, sorting,...read more