Artech Infosystems Senior Java Developer Interview Questions and Answers

30 min .. time, speed, distance

Normal easy qus via leetcode

Q1. Database query of MySQL
Ans. 
MySQL database query
• Use SELECT statement to retrieve data from tables

• Use WHERE clause to filter data based on conditions

• Use JOIN to combine data from multiple tables

• Use ORDER BY to sort data in ascending or descending order

• Use LIMIT to limit the number of rows returned
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Q2. About React.js what is axios call, workflow of connection made with backend
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Q1. Difference between Procedure, Packages and functions.
Ans. 
Procedures, Packages and Functions are all subprograms in PL/SQL with different characteristics.
• Procedures are subprograms that perform a specific task and may or may not return a value.

• Functions are subprograms that always return a value and can be used in SQL statements.

• Packages are a collection of related procedures, functions, variables, and other program constructs that can be used as a single unit.

• Packages provid...read more
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Q2. If table or view does not exist what does it mean
Ans. 
It means that the table or view does not exist in the database.
• The query will fail and return an error message.

• The application may crash or behave unexpectedly.

• The table or view may have been deleted or renamed.

• Check the spelling and syntax of the query.

• Make sure the database connection is established and valid.
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Q3. Difference Between Views and Materialized Views
Ans. 
Views are virtual tables while Materialized Views are physical tables.
• Views are created using SELECT statement while Materialized Views are created using CREATE MATERIALIZED VIEW statement.

• Views do not store data while Materialized Views store data.

• Views are updated dynamically while Materialized Views are updated manually or automatically based on refresh settings.

• Materialized Views are faster for read-heavy workloads...read more
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Q1. Details explanation about the projects and the concepts what we used.
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Around 75 mcq questions with snippets of code

Q1. Interview conducted by technical lead. Around 10-15 questions asked. Questions related to your skills only.
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Q2. Basics of core java
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Q3. SQL queries, scenario based questions
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Q1. Daily routine. Casual question/non technical questions. Tricky question. Puzzles. Sone technical questions.
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Q1. Basic .net,oops,cloud experience any
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Q1. Advanced level plus coding
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Q1. Basic hr Question,salary expectation
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Q1. What is oops concepts
Ans. 
Object-oriented programming concepts that help in organizing and structuring code.
• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes from existing ones, inheriting their properties and behaviors.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and providing simplified interfaces.

• Enca...read more
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Q2. Abstraction polymorphism inheritance encapsulation
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Q1. Basic oops concept
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Q2. SQL related questions
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Q3. Difference between stored procedure and function
Ans. 
Stored procedures are precompiled SQL queries stored in the database, while functions are reusable blocks of code that return a value.
• Stored procedures are stored in the database and can perform multiple operations, while functions are standalone blocks of code.

• Functions return a value, while stored procedures do not necessarily have to return a value.

• Stored procedures can be called explicitly, while functions can be u...read more
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Q1. Performance related questions
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Q1. Java-8 Coding questions
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Q2. Spring boot Questions
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