Infosys Interview Questions, Process, and Tips for Experienced

Moderate and coding was based array problem using brute force algorithm

Q1. Java and oops and dsa question
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Q2. Diff between abstraction and interface
Ans. 
Abstraction is hiding the implementation details while interface is a contract that defines the methods that a class must implement.
• Abstraction is achieved through abstract classes or interfaces in object-oriented programming.

• Abstraction allows us to hide complex implementation details and only show the necessary features to the outside world.

• Interfaces in Java are used to define a contract that a class must follow by ...read more
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Q3. What is hashtable
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A hashtable is a data structure that stores key-value pairs and allows for quick retrieval of values based on their keys.
• Uses a hash function to map keys to indexes in an array

• Provides constant time complexity for insertion, deletion, and retrieval operations

• Commonly used in programming languages like Java and Python for implementing dictionaries or maps
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Q4. What is stack and queue
Ans. 
Stack is a data structure that follows Last In First Out (LIFO) principle. Queue is a data structure that follows First In First Out (FIFO) principle.
• Stack: Last In First Out (LIFO) data structure. Example: stack of plates.

• Queue: First In First Out (FIFO) data structure. Example: waiting line at a ticket counter.
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Q1. About degree and company
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Q1. Tell me about your projects.
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Q1. Prerequisites: Payment gateway If your order fails and payment has been deducted, how do you manage this situation.
Ans. 
In case of order failure with payment deducted, refund the payment and investigate the issue.
• Initiate refund process for the deducted payment

• Investigate the reason for the order failure

• Communicate with the customer about the issue and resolution

• Ensure the payment gateway is functioning correctly to prevent future occurrences
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Q2. What are constructors and its types
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Constructors are special methods used to initialize objects in Java.
• Constructors have the same name as the class and do not have a return type.

• Types of constructors include default constructor, parameterized constructor, and copy constructor.

• Default constructor is provided by Java if no constructor is defined.

• Parameterized constructor takes parameters to initialize an object with specific values.

• Copy constructor create...read more
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Q1. What is diff between index and subscript
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Index is the position of an element in an array, while subscript is the variable used to access elements in an array.
• Index is a fixed value that represents the position of an element in an array.

• Subscript is a variable that is used to access elements in an array.

• Example: arr[2] - '2' is the index, while '2' is the subscript.
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Q2. What is explanation for SPUFI
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SPUFI stands for SQL Processing Using File Input. It is a tool used to execute SQL queries in DB2 databases.
• SPUFI is a menu-driven tool provided by IBM for executing SQL queries in DB2 databases.

• It allows users to interactively execute SQL queries and view the results.

• SPUFI can be used to test SQL statements before embedding them in application programs.

• It is commonly used by developers and database administrators for ...read more
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Q1. How we can improve microservice security
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Improving microservice security involves implementing authentication, authorization, encryption, and monitoring.
• Implement strong authentication mechanisms such as OAuth or JWT

• Use role-based access control for authorization

• Encrypt sensitive data in transit and at rest

• Implement monitoring and logging to detect and respond to security incidents
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Apti, reasoning, communication

Q1. Self intro and project experience
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Q2. Basics of Java programming language
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