Optimus Global Services Digital Marketing Associate Interview Questions and Answers

HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.

• HashMap uses an array of buckets to store key-value pairs

• The hash code of the key is used to determine the index of the bucket

• If multiple keys have the same hash code, they are stored in a linked list within the bucket

• When retrieving a value, the hash code of the key is used to find the bucket and then the linked list is...read more

OOP in Java stands for Object-Oriented Programming which is a programming paradigm based on objects.

• OOP focuses on creating objects that have properties and methods

• Encapsulation, Inheritance, and Polymorphism are the key concepts of OOP

• Java supports OOP through classes and interfaces

• Example: A car can be represented as an object with properties like color, model, and methods like start, stop, and accelerate