Infosys Associate Business Analyst - Technology Interview Questions and Answers

Q1. Write program to get common number from two arraylist using java 8
Ans. 
Program to find common numbers in two arraylists using Java 8
• Use Java 8 streams to filter out common elements between two arraylists

• Convert arraylists to streams, use filter() and collect() methods

• Use distinct() method to avoid duplicate common numbers
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Q2. 2nd highest salary of an employee
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Q1. How the team is been handled
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Q2. Production issues faced recently
Ans. 
Recently faced production issues include server downtime and software bugs.
• Server downtime due to hardware failure

• Software bugs causing crashes and data loss

• Integration issues with third-party systems
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Q1. What is rdbms in sql
Ans. 
RDBMS stands for Relational Database Management System in SQL.
• RDBMS is a type of database management system that stores data in a structured format using rows and columns.

• It allows users to establish relationships between different data sets.

• SQL (Structured Query Language) is commonly used to interact with RDBMS.

• Examples of RDBMS in SQL include MySQL, Oracle, and SQL Server.
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Q2. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to represent multiple data types.

• Examples include method overloading and method overriding in object-oriented programming.
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Js questions , es6 , typescript, react , redux

Relevant experience , work experience,

Q1. Communication Round
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Q2. Best Interaction Skills
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Q1. Technical Skills
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Q1. Explain about azure functions
Ans. 
Azure Functions is a serverless compute service that lets you run event-triggered code without having to explicitly provision or manage infrastructure.
• Azure Functions allows you to write small pieces of code that run in response to events.

• It supports multiple programming languages like C#, JavaScript, Python, etc.

• You can easily integrate Azure Functions with other Azure services like Azure Storage, Azure Cosmos DB, etc...read more
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Q1. Tell me about a time a project was not successful & how you worked through it
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Q2. What does success look like to you
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It was a multiple questions test, 90 minutes test 43 questions technical question based on the position i have applied. It is intermediate level of test. I have cleared the test.

Q1. After completed my Assessment test , I got a call from HR for technical round through WebEx. Yesterday interview done in that call panel asked about my role of my current company and asked about my project...read more
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Q2. Put vs patch in restful
Ans. 
In RESTful APIs, 'put' is used to update an entire resource, while 'patch' is used to update only specific fields of a resource.
• PUT is used to update the entire resource, while PATCH is used to update specific fields

• PUT requires the client to send the entire updated resource, while PATCH only requires the client to send the specific fields to be updated

• PUT is idempotent, meaning multiple identical requests will have th...read more
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Q3. Different between restful and webclient
Ans. 
Restful is an architectural style for designing networked applications, while WebClient is a class in Java used for making HTTP requests.
• RESTful is an architectural style that uses HTTP methods like GET, POST, PUT, DELETE to perform operations on resources.

• WebClient is a class in Java that provides a higher-level API for making HTTP requests and handling responses.

• RESTful APIs are stateless and use standard HTTP status...read more
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Q4. Serialization and deserialization in java
Ans. 
Serialization is the process of converting an object into a byte stream, while deserialization is the process of converting a byte stream back into an object in Java.
• Serialization is achieved by implementing the Serializable interface in Java.

• Deserialization is done by reading the byte stream and reconstructing the object using the readObject() method.

• Example: ObjectOutputStream for serialization and ObjectInputStream
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Q5. What are functional interface in java8
Ans. 
Functional interfaces in Java 8 are interfaces with a single abstract method, used for lambda expressions and method references.
• Functional interfaces have only one abstract method, but can have multiple default or static methods.

• They can be used with lambda expressions and method references.

• Examples include java.lang.Runnable, java.util.Comparator, and java.util.function.Predicate.
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Q1. I was asked question on Oracle Conversions and performance tuning.
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