Programmers.io Technical Lead Interview Questions and Answers

Collection interface is a framework in Java that represents a group of objects.

• Collection interface is part of Java's Collections Framework.

• It provides a unified architecture for representing and manipulating collections of objects.

• Examples of classes that implement Collection interface are ArrayList, LinkedList, and HashSet.

Spring injects dependencies through inversion of control and dependency injection.

• Spring uses inversion of control to manage objects and their dependencies.

• Dependencies are injected into a class through constructor injection, setter injection, or field injection.

• Spring container is responsible for creating and managing objects and their dependencies.

• Example: @Autowired annotation is used for dependency injection in Spr

Hibernate connects to the database using JDBC (Java Database Connectivity) API.

• Hibernate uses JDBC API to establish a connection to the database.

• It uses JDBC drivers to communicate with the database.

• Hibernate configuration file contains database connection details.

• SessionFactory in Hibernate is responsible for creating sessions and managing connections.

Securing APIs involves using authentication, authorization, encryption, and monitoring.

• Implement authentication mechanisms such as OAuth, JWT, or API keys

• Use authorization to control access to APIs based on roles and permissions

• Encrypt data transmission using HTTPS/TLS to prevent eavesdropping

• Implement rate limiting and throttling to prevent abuse and DDoS attacks

• Regularly monitor API traffic and logs for suspicious ac

Multiple DBs can be configured in an application by using database connection pooling, configuring multiple data sources, and managing transactions across databases.

• Use database connection pooling to efficiently manage connections to multiple databases

• Configure multiple data sources in the application to connect to different databases

• Implement transaction management to ensure data consistency across multiple databases

Collection interface is a framework in Java that represents a group of objects.

• Collection interface is part of Java's Collections Framework.

• It provides a unified architecture for representing and manipulating collections of objects.

• Examples of classes that implement Collection interface are ArrayList, LinkedList, and HashSet.