Codewave Technologies Backend Developer Interview Questions and Answers

Database indexing improves query performance by reducing the amount of data scanned during searches.

• Indexes create a data structure that allows for faster retrieval of rows based on specific columns.

• For example, a B-tree index can quickly locate rows in a large table without scanning every row.

• Indexes can significantly speed up search operations, especially in large datasets, by narrowing down the search space.

• Using an...read more

MVC is a software architectural pattern that separates an application into three interconnected components: Model, View, and Controller.

• Model: Represents the data and business logic. Example: A class that interacts with a database.

• View: Displays the data to the user. Example: HTML/CSS templates that render the user interface.

• Controller: Handles user input and updates the Model and View. Example: A REST API endpoint tha...read more

JDBC (Java Database Connectivity) is an API for connecting and executing queries with databases in Java applications.

• JDBC provides a standard interface for connecting to various databases.

• To connect to a database, you need a JDBC driver specific to the database type.

• Example of loading a driver: Class.forName('com.mysql.cj.jdbc.Driver');

• Establish a connection using DriverManager: Connection conn = DriverManager.getConne...read more

Database indexing improves query performance by reducing the number of disk I/O operations needed to retrieve data.

• Indexing allows the database to quickly locate specific rows in a table, reducing the need to scan the entire table.

• Indexes can be created on columns frequently used in WHERE clauses or JOIN conditions.

• Examples of indexes include primary keys, unique constraints, and composite indexes.

• Proper indexing can s...read more

JDK, or Java Development Kit, is a software development environment for developing Java applications.

• JDK includes tools for developing, debugging, and monitoring Java applications.

• It contains the Java Runtime Environment (JRE), which is necessary to run Java applications.

• JDK provides a compiler (javac) to convert Java code into bytecode.

• It includes various libraries and APIs for building Java applications, such as Java...read more

In Java, 'use' typically refers to utilizing libraries, frameworks, or features to enhance functionality and streamline development.

• Java provides a rich set of libraries (e.g., Java Standard Library) that simplify tasks like file handling and networking.

• Frameworks like Spring and Hibernate help in building robust applications by providing pre-built components and patterns.

• Using interfaces and abstract classes promotes ...read more

REST API in backend development is used to allow communication between different systems over the internet.

• Allows for communication between different systems or services

• Follows a client-server architecture

• Uses standard HTTP methods like GET, POST, PUT, DELETE

• Supports multiple data formats like JSON, XML

• Stateless, meaning each request from a client must contain all the information needed to fulfill the request

GET method is used to request data from a server, while POST method is used to submit data to a server in HTTPS.

• GET requests data from a specified resource, while POST submits data to be processed to a specified resource.

• GET requests can be cached and remain in the browser history, while POST requests are not cached and do not remain in the browser history.

• GET requests have length restrictions on the amount of data tha...read more

GET is used to retrieve data from a server, while POST is used to send data to a server.

• GET requests are used to retrieve data from a specified resource. For example, fetching a list of products from an online store.

• POST requests are used to submit data to be processed by a server. For example, submitting a form with user information to create a new account.

• GET requests are idempotent, meaning they can be repeated mult...read more

I am proficient in various UI/UX design tools that enhance my workflow and creativity.

• Figma: Excellent for collaborative design and prototyping.

• Adobe XD: Great for creating interactive prototypes and wireframes.

• Sketch: Ideal for vector-based design and UI components.

• InVision: Useful for prototyping and gathering feedback.

• Miro: Effective for brainstorming and user journey mapping.