Jio Platforms Software Development Engineer II Interview Questions and Answers

A prime number is a positive integer greater than 1 that has no positive integer divisors other than 1 and itself.

• Prime numbers are only divisible by 1 and themselves

• Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97

• Prime numbers are important in cryptography and number theory

Code to check if a number is prime or not.

• A prime number is only divisible by 1 and itself.

• Start checking from 2 up to the square root of the number.

• If the number is divisible by any number in the range, it's not prime.

• Otherwise, it's prime.

What is the average age of a group of people with ages ranging from 20 to 60?

• Add up all the ages and divide by the number of people in the group

• The age range is 40 years

• Assuming an equal distribution of ages, the average age would be 40

Inheritance, abstract class, override, and interface are all concepts in object-oriented programming.

• Inheritance allows a class to inherit properties and methods from another class.

• Abstract classes cannot be instantiated and are used as a blueprint for other classes.

• Override is used to provide a new implementation for a method that is already defined in a parent class.

• Interfaces define a set of methods that a class mus...read more

Full text index is a database index that allows for efficient text-based searching.

• Full text index is used to search for specific words or phrases within a large amount of text data.

• It is commonly used in search engines, document management systems, and social media platforms.

• Full text index can be created on one or more columns of a table in a database.

• It uses techniques such as stemming, stop words, and word proximit...read more

Constructors and destructors are special methods used in object-oriented programming languages to initialize and destroy objects.

• Constructors are used to initialize objects when they are created.

• Destructors are used to clean up resources used by an object when it is destroyed.

• Constructors have the same name as the class and are called automatically when an object is created.

• Destructors have the same name as the class p...read more

PHP 7 is faster, more secure and has new features compared to PHP 5.

• PHP 7 has improved performance with up to 2x faster execution

• PHP 7 has better error handling and type declarations

• PHP 7 has new operators and functions like spaceship operator and null coalescing operator

• PHP 7 has removed deprecated features like mysql extension

• PHP 7 has improved support for Unicode

• PHP 7 requires 64-bit architecture

• PHP 7 has improved m...read more

PHP caching, session handling, and API token security

• PHP caching techniques include opcode caching, data caching, and query caching

• Session handling in PHP involves creating a unique session ID for each user and storing session data on the server

• To prevent token hijacking in APIs, use HTTPS, set expiration times for tokens, and use token revocation

• Other security measures include input validation, output encoding, and us

Store procedures, indexes, and virtual tables are important features of MySql.

• Store procedures are pre-written code blocks that can be executed on demand.

• Indexes are used to speed up database queries by creating a quick lookup table.

• Virtual tables are temporary tables that are created on the fly and do not persist in the database.

• Examples of store procedures include creating a new user or updating a record.

• Examples of ...read more

Questions related to Java concepts and frameworks

• Fail safe fail fast - used in concurrent programming to handle exceptions and ensure thread safety

• String is immutable to ensure thread safety and prevent unintended changes to the string

• String buffer vs String builder - both are used to manipulate strings, but string builder is faster and not thread-safe

• Executor framework - used for asynchronous task execution and thread...read more