L1 Support Engineer Interview Questions and Answers for Freshers

Objects and classes are fundamental concepts in Java programming language.

• Objects are instances of classes that encapsulate data and behavior.

• Classes are templates or blueprints that define the properties and methods of objects.

• Objects communicate with each other by invoking methods on each other.

• Inheritance allows classes to inherit properties and methods from other classes.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

Ops concept refers to the practice of DevOps, which involves collaboration between development and operations teams to improve software delivery.

• Ops concept is a key component of DevOps

• It involves collaboration between development and operations teams

• The goal is to improve software delivery and reliability

• Types of Ops concepts include continuous integration, continuous delivery, and continuous deployment

Joins in SQL are used to combine data from two or more tables based on a related column.

• Joins are used to retrieve data from multiple tables in a single query

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN

• Joins are performed using the JOIN keyword and specifying the tables and the columns to join on

• Example: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column