⏱️ Time: 2 Hours
📊 Maximum Marks: 50

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📌 Instructions (Read Carefully):

• Attempt all questions.
• Each question must be implemented using separate classes.
• Follow proper OOP design (class, methods, inheritance, etc.).
• Use Scanner class for user input wherever mentioned.
• Display output clearly with proper labels.
• Write comments to explain your logic.

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🔹 Section A – Core Programming (30 Marks)

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Q1. Class, Object & Constructor (10 Marks)

📘 Case Study: Online Food Ordering System

A food ordering platform wants to manage food item details and calculate total bill.

👉 Write a Java program with the following requirements:

1. Create a class named FoodItem.
2. Declare the following data members:
   • itemId (int)
   • itemName (String)
   • price (double)
   • quantity (int)
3. Create a parameterized constructor:
   • Initialize all data members using this keyword
4. Create a method calculateTotal():
   • Calculate total price = price × quantity
   • Return total
5. Create a method displayDetails():
   • Display all details including total price
6. In the main() method:
   • Ask user to enter details of 2 food items
   • Create objects
   • Display bill for each item

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Q2. Inheritance & Method Overriding (10 Marks)

📘 Case Study: Employee Bonus System

A company gives bonus based on employee role.

👉 Write a Java program as follows:

1. Create a base class Employee:
   • Variable: name
   • Method calculateBonus() → default message
2. Create subclasses:
   • Manager
   • Clerk
3. Override method:
   • Manager → Bonus = ₹8000
   • Clerk → Bonus = ₹3000
4. In main():
   • Create objects of both classes
   • Call method and display bonus
5. Output should clearly indicate:
   • Employee type
   • Bonus amount

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Q3. Encapsulation (10 Marks)

📘 Case Study: ATM System

An ATM system needs secure handling of account balance.

👉 Write a Java program with the following steps:

1. Create a class ATMAccount.
2. Declare private variables:
   • accountNumber (int)
   • accountHolder (String)
   • balance (double)
3. Provide:
   • Getter and Setter methods
4. Add validation:
   • Balance cannot be negative
5. Create methods:
   • deposit(double amount)
   • withdraw(double amount)
6. Conditions:
   • Withdrawal allowed only if sufficient balance
   • Otherwise print "Transaction failed: insufficient balance"
7. In main():
   • Create object
   • Perform deposit and withdrawal
   • Display final balance

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🔹 Section B – Advanced OOP Concepts (20 Marks)

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Q4. Abstract Class (10 Marks)

📘 Case Study: Vehicle Service System

Different vehicles have different service charges.

👉 Write a Java program as follows:

1. Create an abstract classVehicleService:
   • Abstract method calculateServiceCharge()
2. Create subclasses:
   • CarService
   • BikeService
3. Implement method:
   • Car → ₹2000
   • Bike → ₹800
4. In main():
   • Use abstract class reference
   • Create objects of subclasses
   • Display service charges
5. Output should clearly show:
   • Vehicle type
   • Service charge

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Q5. Runtime Polymorphism (10 Marks)

📘 Case Study: Online Subscription System

Different subscription plans have different monthly costs.

👉 Write a Java program with the following instructions:

1. Create a class Subscription:
   • Method getMonthlyCost()
   • Default: return 0
2. Create subclasses:
   • BasicPlan
   • PremiumPlan
3. Override method:
   • Basic → ₹199/month
   • Premium → ₹499/month
4. In main():
   • Use parent class reference
   • Assign objects of subclasses
   • Display cost
5. Clearly demonstrate:
   • Runtime polymorphism
   • Same method behaving differently

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⭐ Bonus Question (Optional – 5 Marks)

Q6. Custom Exception Handling

📘 Case Study: Login System

👉 Write a Java program to:

1. Ask user to enter:
   • Username
   • Password
2. Validate:
   • If username ≠ “admin” OR password ≠ “1234”
   • Throw a custom exception "Invalid Login"
3. Use:
   • try-catch
   • Custom exception class
4. Finally block should print: Login attempt finished