⏱️ Time: 2 Hours
📊 Maximum Marks: 50

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📌 Instructions (Read Carefully):

• Attempt all questions.
• Write each program in a separate class/file.
• Use proper OOP concepts and naming conventions.
• Use Scanner class for user input wherever required.
• Display output in a clear and labeled format.
• Add comments to explain important parts of your code.

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🔹 Section A – Core Programming (30 Marks)

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Q1. Class, Object & Constructor (10 Marks)

A gym management system needs to store and display details of members.

👉 Write a Java program with the following requirements:

1. Create a class named GymMember.
2. Declare the following instance variables:
   • memberId (int)
   • memberName (String)
   • membershipType (String)
   • monthlyFee (double)
3. Create a parameterized constructor:
   • It should accept values for all data members
   • Initialize them using the this keyword
4. Create a method displayMemberDetails():
   • Display all member details in proper format
   • Example: Member ID: 1
Name: Rahul
Membership: Gold
Monthly Fee: 2000.0
5. In the main() method:
   • Ask the user to enter details for 2 members
   • Create objects using constructor
   • Display details of both members

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Q2. Inheritance & Method Overriding (10 Marks)

A delivery company calculates shipping cost based on package type.

👉 Write a Java program following these steps:

1. Create a base class Shipment:
   • Method calculateCost(double weight)
   • Default message: "Cost calculation not defined"
2. Create subclasses:
   • StandardShipment
   • ExpressShipment
3. Override the method:
   • Standard → ₹20 per kg
   • Express → ₹40 per kg
4. In the main() method:
   • Ask user to enter package weight
   • Create objects of both subclasses
   • Calculate and display cost
5. Output must clearly show:
   • Shipment type
   • Weight
   • Total cost

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Q3. Encapsulation (10 Marks)

An online wallet system needs to securely manage user balance.

👉 Write a Java program with the following specifications:

1. Create a class Wallet.
2. Declare private variables:
   • walletId (int)
   • userName (String)
   • balance (double)
3. Provide:
   • Getter and Setter methods
4. Add validation:
   • Balance should not be negative
   • If invalid, display "Invalid balance amount"
5. Create methods:
   • addMoney(double amount) → increase balance
   • spendMoney(double amount) → decrease balance if sufficient
6. If balance is insufficient:
   • Display "Insufficient funds"
7. In the main() method:
   • Create object
   • Set initial values
   • Perform add and spend operations
   • Display final wallet details

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🔹 Section B – Advanced OOP Concepts (20 Marks)

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Q4. Interface (10 Marks)

A multimedia application plays different types of media files.

👉 Write a Java program as follows:

1. Create an interface MediaPlayer:
   • Method play()
   • Method stop()
2. Implement the interface in:
   • AudioPlayer
   • VideoPlayer
3. Define behavior:
   • Audio → "Playing audio" / "Stopping audio"
   • Video → "Playing video" / "Stopping video"
4. In the main() method:
   • Use interface reference
   • Create objects of both classes
   • Call methods
5. Ensure:
   • Proper interface implementation
   • Clear output messages

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Q5. Runtime Polymorphism (10 Marks)

A billing system calculates discount based on customer type.

👉 Write a Java program with the following steps:

1. Create a class Customer:
   • Method getDiscount(double amount)
   • Default: return 0
2. Create subclasses:
   • RegularCustomer
   • PremiumCustomer
3. Override method:
   • Regular → 5% discount
   • Premium → 15% discount
4. In the main() method:
   • Use parent class reference
   • Assign subclass objects
   • Calculate and display final amount
5. Output must show:
   • Customer type
   • Original amount
   • Discount applied
   • Final amount

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⭐ Bonus Question (Optional – 5 Marks)

Q6. Exception Handling with Validation

👉 Write a Java program to:

1. Ask user to enter:
   • Age
2. Validate:
   • Age must be greater than 0
3. If invalid:
   • Throw exception and display "Invalid age entered"
4. Use:
   • try-catch
   • throw keyword
5. Finally block should print: