⏱️ Time: 2 Hours
📊 Maximum Marks: 50

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📌 Instructions (Very Important):

• Attempt all questions.
• Programs in this paper may require multiple classes working together.
• Follow proper OOP design (modular classes, reuse, clarity).
• Use Scanner class for input wherever required.
• Output must be well-structured and labeled.
• Add comments explaining logic and OOP usage.

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🔹 Section A – Integrated Core System (30 Marks)

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Q1. Case Study: Online Shopping System (15 Marks)

You are required to design a simple online shopping system using OOP concepts.

👉 Program Requirements:

Step 1: Create a class Product

• Data members:
  • productId (int)
  • productName (String)
  • price (double)
• Create:
  • Parameterized constructor
  • Method displayProduct()

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Step 2: Create a class Cart

• Data members:
  • quantity (int)
• Create methods:
  • calculateTotal(Product p)
    • Total = product price × quantity

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Step 3: Create a class Discount

• Method applyDiscount(double totalAmount)
  • If amount > 1000 → 10% discount
  • Otherwise → no discount

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Step 4: Main Method Requirements:

• Take input:
  • Product details
  • Quantity
• Perform:
  • Display product details
  • Calculate total amount
  • Apply discount
  • Display final bill

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👉 Expected Output Format:

Product: Laptop
Price: 50000
Quantity: 1
Total: 50000
Discount Applied: 5000
Final Amount: 45000

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Q2. Case Study: Bank System with Encapsulation (15 Marks)

Design a simple banking system using encapsulation and multiple methods.

👉 Program Requirements:

Step 1: Create class BankAccount

• Private variables:
  • accountNumber
  • accountHolderName
  • balance

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Step 2: Provide:

• Getter and Setter methods
• Validation:
  • Balance cannot be negative

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Step 3: Create methods:

• deposit(double amount)
• withdraw(double amount)
  • Only if balance is sufficient
• displayAccountDetails()

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Step 4: Main Method:

• Create account object
• Set values
• Perform:
  • Deposit
  • Withdrawal
• Display final account details

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👉 Output must clearly show:

• Initial balance
• Transaction details
• Final balance

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🔹 Section B – Advanced Integrated OOP (20 Marks)

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Q3. Case Study: Employee Management System (10 Marks)

This program must demonstrate Inheritance + Polymorphism.

👉 Requirements:

Step 1: Create base class Employee

• Method calculateSalary()

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Step 2: Create subclasses:

• PermanentEmployee
• ContractEmployee

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Step 3: Override method:

• Permanent → Fixed salary ₹40,000
• Contract → ₹500 per day × 20 days

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Step 4: Main Method:

• Use parent class reference
• Assign subclass objects
• Display salary

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👉 Must demonstrate:

• Runtime polymorphism
• Clear output

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Q4. Case Study: Payment Gateway using Interface (10 Marks)

This program must demonstrate Interface-based design.

👉 Requirements:

Step 1: Create interface PaymentGateway

• Method pay(double amount)

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Step 2: Implement in:

• CreditCard
• UPI

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Step 3: Define behavior:

• CreditCard → print payment success message
• UPI → print payment success message

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Step 4: Main Method:

• Use interface reference
• Perform payments using both methods

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👉 Output must clearly show:

• Payment method used
• Amount paid

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⭐ Bonus Question (Optional – 5 Marks)

Q5. Exception Handling in Integrated System

👉 Modify any one of the above programs to:

1. Handle invalid input:
   • Negative values
   • Wrong data type
2. Use:
   • try-catch
   • finally
3. Display: