NICE Interview Questions and Answers

The pillars of OOP are encapsulation, inheritance, and polymorphism.

• Encapsulation: bundling of data and methods into a single unit

• Inheritance: ability to create new classes from existing ones

• Polymorphism: ability to use a single interface for multiple types

Web API security mechanisms protect against unauthorized access and ensure data integrity.

• Authentication: Verify the identity of the user or client accessing the API.

• Authorization: Determine what actions the authenticated user or client is allowed to perform.

• Encryption: Securely transmit data over the network using encryption algorithms.

• Input validation: Validate and sanitize user input to prevent common security vulne...read more

Deadlock in SQL occurs when two or more transactions permanently wait for each other to release resources.

• Deadlock happens when two or more transactions acquire locks on resources and wait for each other indefinitely.

• It can occur due to poor transaction scheduling, lock contention, or incorrect use of transactions.

• To prevent deadlock, use proper transaction isolation levels, minimize lock contention, and ensure transac...read more

OOPs concepts refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation detail

Designing a machine involves creating a detailed plan for its structure, functionality, and operation.

• Consider the purpose of the machine and its intended use

• Identify the key components and their interactions

• Create a schematic or blueprint detailing the layout and connections

• Select appropriate materials and technologies for construction

• Test the machine for functionality and efficiency