MindGate Solutions Interview Questions and Answers

Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.

• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an o...read more

Streams in Java provide a way to process collections of objects in a functional style.

• Streams are sequences of elements that support various operations like filter, map, reduce, etc.

• They can be created from collections, arrays, or generate elements dynamically.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Cha...read more

Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.

• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.

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...read more

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...read more

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