esQuare Technologies Interview Questions and Answers

Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and share data.

• Middleware helps to streamline communication between different systems or components.

• It can handle tasks such as authentication, logging, and error handling.

• Examples of middleware include Express.js in Node.js for handling HTTP requests and responses.

Migrations are a way to manage database schema changes in a structured and organized manner.

• Migrations allow developers to make changes to the database schema without losing data.

• They are typically written in code and can be version controlled.

• Migrations can be used to create, modify, or delete database tables, columns, indexes, etc.

• Popular frameworks like Laravel, Django, and Ruby on Rails have built-in support for mi

Java does not support multiple inheritance to avoid the diamond problem and maintain simplicity.

• Java supports single inheritance to avoid ambiguity and complexity.

• Multiple inheritance can lead to the diamond problem where a class inherits from two classes that have a common ancestor.

• To resolve the diamond problem, Java uses interfaces which allow multiple inheritance of behavior but not state.