Password Management System (Java CLI)

A Java command-line password management system that lets a user:

• Log in using a master password
• Generate strong passwords
• Add / update / delete stored credentials
• Display saved passwords
• Show “unsafe” passwords by comparing stored passwords against hackedPassword.txt
• Create / view / delete memos stored in Memo.txt

Features

• Password generator (includes letters, digits, and symbols)
• Password validation (length + digit count + special characters + uppercase + lowercase)
• File persistence:
  • passwordDB.txt for saved passwords
  • Memo.txt for memos
  • hackedPassword.txt for unsafe-password comparison

Project Structure

• PMS/src/Main.java — application entry point (login + main menu)
• PMS/src/PasswordManagement.java — linked-list based CRUD for passwords + persistence to passwordDB.txt
• PMS/src/MemoManagement.java — memo list + persistence to Memo.txt
• PMS/src/PasswordGenerator.java — password generation logic
• PMS/src/NodePassword.java — node structure for the password linked list

How to Run

Run using existing compiled classes

From the repository root:

cd d:/Password-Management-System-main
java -cp PMS/out/production/PMS Main

(Optional) Compile first

cd d:/Password-Management-System-main
javac PMS/src/*.java
java -cp PMS/src Main

Note: Using PMS/out/production/PMS is the most reliable with the current project state.

Master Password

In PMS/src/Main.java, the login check is hardcoded as:

• master password: admin

Menu Options

After login, the program shows:

• [1] Generate Password
• [2] Update Password
• [3] Delete Password
• [4] Saved Passwords
• [5] Unsafe Passwords list
• [6] Create Memo
• [7] Delete Memo
• [8] View Memos
• [0] Exit System

Data Files Used

Ensure these files exist in the working directory (d:/Password-Management-System-) when running:

• passwordDB.txt
• Memo.txt
• hackedPassword.txt

If they are missing, the app may print messages like “File not found”.

Notes / Known Issues

• The memo loader prints Memo File Not Found ! if Memo.txt is missing.
• Input handling in Main.java mixes multiple Scanner instances; depending on the runtime inputs, it may throw NoSuchElementException.