ISL48 Advanced Java Lab 🚀

This repository contains solutions to all lab experiments for ISL48 – Advanced Java Laboratory. Each program demonstrates core Java concepts like interfaces, packages, GUI development, exception handling, collections, generics, JDBC, Swing, and JSP-based web applications.

---

🧪 List of Experiments

---

✅ 1. Payroll System using Interface and Packages

📌 Question:

Write a Java Program for the following Payroll System. Create a package called PayrollManagement. Define an interface Payable with a method calculate().
Create a superclass called Employee with data members: name, age, salary, and designation. Use a parameterized constructor to initialize them.
The Employee class is inherited by FullTime, PartTime, and Intern, all implementing Payable.

• FullTime: Monthly salary
• PartTime: Hourly wages
• Intern: Fixed stipend
  Create another package Company and import these classes.
  Store all employees in an ArrayList<Employee>.

🔧 Highlights:

• Packages: PayrollManagement, Company
• Inheritance + Interface
• Polymorphism in salary calculation
• Dynamic data storage with ArrayList

---

✅ 2. Queue Implementation with Custom Exceptions

📌 Question:

Create a Queue class to store String names and implement enqueue, dequeue, and display.
Use Custom Exceptions:

• QueueOverflowException
• QueueUnderflowException

🔧 Highlights:

• Data structure: Queue
• Custom exception handling
• Queue behavior simulation using arrays or lists

---

✅ 3. String Operations using Interface and Packages

📌 Question:

Define a package stringoperations and an interface StringManipulator with methods:

• reverse(String input)
• toUpperCase(String input)
• concatenate(String str1, String str2)
• countVowels(String input)
• wordCount(String input)
  Implement in StringProcessor.
  Create a main class in application package that takes input from user and tests all methods.

🔧 Highlights:

• Interface-based design
• Two-package separation
• String operations and metrics
• Modular, testable design

---

✅ 4. Palindrome Checker with Custom Exceptions

📌 Question:

Create a palindrome checker using StringBuffer.
Implement exception handling:

• InvalidInputException: if input has special characters
• LongStringException: if string length > 5
• Ignore case while checking
  Show appropriate messages.

🔧 Highlights:

• Exception handling
• String reversal using StringBuffer
• Clean validations
• Case-insensitive palindrome check

---

✅ 5. Password Security Application

📌 Question:

Create a Java app that performs password validation:

• Check for uppercase, lowercase, digit
• Count special and non-special characters
• Mask the password (show only first and last chars)
• Reverse password
• Append a security token (e.g., @123!)
• Replace vowels with #

🔧 Highlights:

• Regex-based checks
• Password transformations
• Encryption-style manipulation

---

✅ 6. Missed Call Management System

📌 Question:

Maintain a LinkedList of contact details (name, number).
For each incoming call:

• Store time, number, and name (or "Private Caller") in an ArrayList.
• Max 5 calls: remove oldest if exceeded.
  For each call:
• Let user delete or view it
• Options to view contact list and missed call list

🔧 Highlights:

• LinkedList + ArrayList
• Max queue size: 5
• Contact lookup logic
• User-driven deletion/viewing

---

✅ 7. Book Database with HashMap and Sorting

📌 Question:

Create a Book class with: title, author, publisher, price, and a unique book ID.
Store books in a HashMap.

• Sort books by price → new List
• Search by author
• Filter books above a user-specified price

🔧 Highlights:

• Uses HashMap and ArrayList
• Comparable / Comparator
• Multiple filters and views
• Unique ID maintenance

---

✅ 8. Generic Stack using ArrayList

📌 Question:

Create a generic class Stack<T> with:

• push(), pop(), clear(), isEmpty(), display()
  Backed by ArrayList.
  Demonstrate with String and Float.

🔧 Highlights:

• Java Generics
• Type-safe stack
• Demonstration with multiple types
• Internal storage: ArrayList<T>

---

✅ 9. Student CGPA Swing Application

📌 Question:

Create a Swing app for student details: name, usn, age, address, sgpas (4 sems), and category (ComboBox).

• Validate fields with pop-up errors
• Compute CGPA
• Done: add to collection
• Complete: display collection in TextArea
• Control button visibility dynamically

🔧 Highlights:

• Java Swing GUI
• Input validation
• Event-driven programming
• Form state management

---

✅ 10. Login & Purchase Validation App (Swing)

📌 Question:

Build a Swing GUI app for login and item purchase:

• Validate login with dialog boxes
• Handle new/existing customers
• Enter item ID & quantity
• Show item name and cost
• Offer discount choices
• Print button shows purchase info in dialog

🔧 Highlights:

• Dialog-based validation
• Customer and item entry
• Dynamic GUI updates
• User interaction flow

---

✅ 11. Representative-Customer Management (Swing + JDBC)

📌 Question:

Create a desktop app using Swing and JDBC:

• Create Representative and Customer tables in MySQL
• Insert data via Swing forms
• Display Representative info if Credit_Limit > 15,000

🔧 Highlights:

• JDBC integration
• SQL table operations
• Conditional query logic
• Multi-form GUI

---

✅ 12. JSP Shirt Purchase Web Application

📌 Question:

Create a JSP-based web app for shirt purchase:

• Show shirt types and cost (table)
• Dropdown for shirt type
• Radio buttons for neck type
• Input quantity
• Compute button → total cost + purchase info

🔧 Highlights:

• JSP front-end logic
• Table + dropdown + radio + textbox
• Price computation and display
• Interactive UI

---

👨‍💻 Author
Nithish Reddy
B.E. ISE – Ramaiah Institute of Technology

testing