Here are some real-life Java project ideas focused on Data Structures and Algorithms (DSA).

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🛒 Shopping Cart System (Using HashMaps & Lists)

• Description: Simulate a basic e-commerce cart system.
• DSA Concepts: HashMap (for product ID to product info), ArrayList (for items in cart).
• Features:
  • View Products: Browse available items with stock status
  • Add to Cart: Select items and adjust quantity
  • Remove from Cart: Remove individual items
  • Checkout: Generate bill and update inventory
  • Apply Discount Codes: Simulate simple discount mechanisms

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🧾 Task Tracker

• Description: A CLI-based or GUI app that helps schedule tasks.
• DSA Concepts: ArrayList.
• Features:
  • Add a task
  • Update
  • Delete
  • Task Status (TODO, INPROGRESS, DONE)
  • All upcoming tasks

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🔒 Password Manager (String Manipulation + HashMap)

• Description: Store and retrieve passwords.
• DSA Concepts: HashMap (site → password), String processing, basic encryption algorithms.
• Features:
  • Add/login to accounts
  • Auto-generate strong passwords
  • Search by site name

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🧠 Quiz/Flashcard App (Linked List + Stack)

• Description: Study app using flashcards and quizzes.
• DSA Concepts: LinkedList (card navigation), Stack (revisiting questions).
• Features:
  • Add/edit/remove flashcards
  • Shuffle deck
  • Track incorrect answers (for retry stack)

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🌐 Social Network Graph

• Description:Users are represented as nodes in a graph, and friendships are represented as edges. The system recommends new friends by analyzing friends of friends using graph traversal techniques.
• DSA Concepts: Graph (Adjacency List), HashMap, HashSet, Queue, BFS
• Features:
  • Add new users to the network
  • Create friendships between users
  • Find mutual friends between two users
  • Recommend friends using BFS (friends of friends)
  • Display user connections

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