Day 3: Collections and File Handling

Topics:

• Arrays and Collections (List, Set, Map)
• File I/O
• Exception Handling
• Iterators and Streams

Project: Contact Management System

• Description: Build a contact manager where users can store, update, and search for contacts. Contacts should be stored in a file.
• Core Features:
  • Use a List or Map to store contacts (name, phone, email).
  • Add file handling to save and retrieve contact data from a text file (use file streams).
  • Implement CRUD (Create, Read, Update, Delete) operations.
  • Add robust error handling for file operations and invalid inputs.