PhoneBook Application

Overview

This Java-based PhoneBook application demonstrates fundamental Object-Oriented Programming (OOP) principles, including abstraction, encapsulation, inheritance, polymorphism, and method overriding. The system features an Admin and Normal User interface, allowing users to manage a phonebook directory.

Features

• Admin Features:

  • Add, edit, delete, and sort phonebook entries
  • Search phonebook entries using linear search (by phone number) and binary search (by ID)
  • Print admin details
  • Change username and password

• Normal User Features:

  • Add and edit phonebook entries
  • Search phonebook entries using linear search
  • Sort phonebook entries
  • Print user details

Technologies Used

• Java
• File I/O (Reading users from a file)
• Sorting Algorithms (Selection sort)
• Interfaces & Inheritance (Admin and User roles)
• Encapsulation & Polymorphism

How to Run

1. Compile the Java files:

   javac *.java