TO THE NEW Interview Questions, Process, and Tips

Encapsulation is the process of hiding implementation details and exposing only necessary information.

• Encapsulation helps in achieving data abstraction and information hiding

• It prevents unauthorized access to data and protects data from external interference

• It allows for easy modification of implementation without affecting the rest of the code

• Example: A class in Java with private variables and public methods

Abstraction is a concept of hiding implementation details while interface is a blueprint of a class.

• Abstraction is achieved through abstract classes and methods

• Interface is a contract that defines the behavior of a class

• Abstraction focuses on hiding complexity while interface focuses on providing a common standard

• Abstraction can have implementation details while interface cannot

• A class can implement multiple interfaces

Implementation of a linked list

• Define a Node class with data and next pointer

• Create a LinkedList class with head pointer

• Implement methods to add, delete, and traverse nodes

• Handle edge cases like empty list or deleting head node

WAP to sort an array using quick sort

• Choose a pivot element from the array

• Partition the array into two sub-arrays based on the pivot

• Recursively sort the sub-arrays

• Combine the sorted sub-arrays

A program to find unique characters in a word.

• Create an empty array to store unique characters.

• Loop through each character in the word.

• If the character is not already in the array, add it.

• Return the array of unique characters.