Responsive Interview Questions and Answers

Q1. Explain about OOPS and why java doesn't support multi-level inheritance
Ans. 
OOPS is a programming paradigm based on objects and classes. Java doesn't support multi-level inheritance to avoid ambiguity and complexity.
• OOPS stands for Object-Oriented Programming System, where programs are organized around objects rather than actions.

• Java supports single inheritance, where a class can only inherit from one superclass to avoid the diamond problem.

• Multi-level inheritance in Java can lead to ambiguit...read more
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Q2. Explain about ACID and multi-threading
Ans. 
ACID is a set of properties that guarantee reliable database transactions. Multi-threading involves multiple threads executing code concurrently.
• ACID stands for Atomicity, Consistency, Isolation, Durability

• Atomicity ensures that all operations in a transaction are completed successfully or none at all

• Consistency ensures that the database remains in a valid state before and after the transaction

• Isolation ensures that tr...read more
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Q1. DML vs DDL in database
Ans. 
DML is used to manipulate data in a database, while DDL is used to define the structure of the database.
• DML stands for Data Manipulation Language and is used for operations like INSERT, UPDATE, DELETE.

• DDL stands for Data Definition Language and is used for operations like CREATE, ALTER, DROP.

• DML is used to modify existing data in a database, while DDL is used to define the structure of the database.

• Examples of DML stat...read more
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Q2. Explain how DB consistency in multi-threading
Ans. 
DB consistency in multi-threading ensures that data remains accurate and up-to-date across multiple threads.
• Use transactions to ensure atomicity and isolation of database operations.

• Implement proper locking mechanisms to prevent data corruption in concurrent access.

• Consider using optimistic concurrency control techniques to handle conflicts.

• Use database triggers or constraints to enforce data integrity rules.

• Regularly ...read more
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2 technical Rounds on java each 1 hour

Q1. Explain about Threads
Ans. 
Threads are lightweight processes within a program that can run concurrently, allowing for multitasking and improved performance.
• Threads share the same memory space within a process

• Threads can communicate with each other through shared memory or message passing

• Threads can be used for parallel processing, handling multiple tasks simultaneously

• Examples: Java threads, POSIX threads (pthread)
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Q2. Explain about Spring boot controllers and SQL Comands
Ans. 
Spring Boot controllers handle incoming HTTP requests and SQL commands are used to interact with databases.
• Spring Boot controllers are classes annotated with @RestController that handle incoming HTTP requests

• SQL commands are used to interact with databases to perform operations like insert, update, delete, and select

• Controllers in Spring Boot can use SQL commands to fetch data from a database and return it as a respons
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Q3. High Availability
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